feat(phase2c): 群聊与已读回执功能完整实现

Phase 2c 全部 14 个 Task 完成，包含：后端（Go）： - MinIO 文件存储服务集成（Docker + Go SDK + 通用上传 API） - Group 模块完整实现（DAO + Service + Controller + Router + Wire） - 18 个群管理 REST API + 11 个 WS 群事件推送 - 群创建/解散/邀请/踢人/退出/转让群主/设管理员/禁言/全体禁言/群公告/群昵称/免打扰/搜索 - IM Service 扩展（群消息发送/撤回 + @提醒 + 管理员无时限撤回） - 已读回执后端（单聊会话级 last_read_msg_id + 群聊消息级 im_message_reads） - 管理端群组管理（列表/详情/解散） - 数据库迁移（3 张新表 + 2 张表字段扩展）前端（uni-app）： - 群聊 Store + API 封装 + 11 个 WS 事件监听 - 已读回执 UI（单聊已读/未读标记 + 群聊 X人已读 + 已读详情页） - 7 个群聊页面（对话/创建/设置/成员/邀请/审批/搜索） - 会话列表改造（全部/单聊/群聊 Tab + @标记 + 免打扰标识）管理端（Vue 3 + Element Plus）： - 群组列表页（搜索/分页/详情弹窗/解散群聊） - 侧边栏群组管理入口文档同步：进度/架构/设计/API/规范文档全部更新 Made-with: Cursor
2026-03-04 14:58:23 +08:00
parent ad76d9a613
commit 19979da59e
77 changed files with 10053 additions and 490 deletions
--- a/.cursor/rules/project-context.mdc
+++ b/.cursor/rules/project-context.mdc
@@ -18,10 +18,11 @@ alwaysApply: true
 - **Phase 2a（WebSocket 实时通讯与联系人管理）**：✅ 全部完成（13 个 Task + 后期 Bug 修复 3 项）
 - **Phase 2b（即时通讯消息系统）**：✅ 全部完成（10 个 Task + 代码审查修复 7 项 + 用户测试修复 8 项），设计文档 `docs/plans/2026-03-03-phase2b-design.md`
 - 分支：`feature/phase2b-instant-messaging`
- **Phase 2c（群聊与已读回执）**：📋 设计完成，待实施（14 个 Task），设计文档 `docs/plans/2026-03-04-phase2c-design.md`，实施计划 `docs/plans/2026-03-04-phase2c-implementation.plan.md`
+- **Phase 2c（群聊与已读回执）**：✅ 全部完成（14 个 Task + 代码审查修复 14 项），设计文档 `docs/plans/2026-03-04-phase2c-design.md`
 - 分支：`feature/phase2c-group-read-receipt`
- 范围：群聊全功能（三级角色/禁言/@提醒/群公告/入群审批）+ 已读回执（单聊会话级 + 群聊消息级）+ MinIO 文件存储 + 管理端群聊管理
- **跨模块通信模式**：已建立接口注入标准（ws.FriendIDsGetter / im.FriendChecker / im.UserInfoGetter → contact.FriendshipDAO，im.OfflineMessagePusher → ws.Handler，contact.OnlineChecker → ws.OnlineService），Phase 2c 新增 im.GroupMemberChecker / im.GroupInfoGetter → group.GroupDAO
+- 范围：群聊全功能（三级角色/禁言/@提醒/群公告/入群审批）+ 已读回执（单聊会话级 + 群聊消息级）+ MinIO 文件存储 + 管理端群组管理
+- 代码审查修复：Critical×5（角色类型/公告字段/at_user_ids/@导航/Wire 注册）+ Important×4 + Minor×2 + Suggestion×3
+- **跨模块通信模式**：接口注入标准（ws.FriendIDsGetter / im.FriendChecker / im.UserInfoGetter → contact.FriendshipDAO，im.OfflineMessagePusher → ws.Handler，contact.OnlineChecker → ws.OnlineService，im.GroupInfoGetter → group.GroupDAO，im.MessageReadRecorder → group.MessageReadDAO，group.UserInfoProvider → auth.UserDAO，group.MessageWriter → im.MessageDAO）

 ## 项目概述

@@ -30,8 +31,8 @@ EchoChat 是一个实时音视频通讯平台，包含三个子项目：
 - `frontend/` — 前台用户端（uni-app + Vue 3.4 + Pinia 2.x）
 - `admin/` — 后台管理端（Vue 3.5+ + Element Plus + Pinia 3.x）

-已实现模块：auth（认证）、contact（联系人）、ws（WebSocket）、admin（管理端）、im（即时通讯）
-Phase 2c 待实现模块：group（群聊管理）、file（文件上传/MinIO）+ im 扩展（已读回执）
+已实现模块：auth（认证）、contact（联系人）、ws（WebSocket）、admin（管理端）、im（即时通讯 + 已读回执）、group（群聊管理）、file（文件上传/MinIO）
+前端常量：`frontend/src/constants/group.js`（GROUP_ROLE / GROUP_STATUS / JOIN_REQUEST_STATUS，与后端 constants/group.go 对齐）

 ## 核心开发规则

@@ -45,10 +46,48 @@ Phase 2c 待实现模块：group（群聊管理）、file（文件上传/MinIO
 8. **角色等级体系**：`auth_roles.level` 字段（值越小权限越高：1=超管, 10=管理员, 100=普通用户），所有管理操作强制执行层级权限校验
 9. **代码注释**：所有公开函数、组件、Store 必须有详细注释
 10. **后端架构规范**：详见 `docs/conventions/backend-module-architecture.md`（模块分层/接口注入/日志/错误处理/批量查询/系统消息/Store 封装等）
-11. **文档自动同步（强制）**：每个 Task 或功能开发完成后，必须自动执行文档同步，详见下方「文档自动同步规则」
-12. **验证方式**：使用 Playwright MCP 进行页面自动化验证
-13. **代码审查**：每个 Task 完成后，使用 `code-reviewer` 子代理进行结构化审查，确保代码质量和计划一致性
-14. **完成验证**：使用 `verification-before-completion` 技能，在声称完成前运行验证命令并确认输出
+11. **代码风格全局一致（最高优先级）**：新编写的任何模块代码，必须严格参照已有模块的实际代码实现和风格，禁止自创新封装、新 API、新模式。详见下方「代码风格全局一致规则」
+12. **文档自动同步（强制）**：每个 Task 或功能开发完成后，必须自动执行文档同步，详见下方「文档自动同步规则」
+13. **验证方式**：使用 Playwright MCP 进行页面自动化验证
+14. **代码审查**：每个 Task 完成后，使用 `code-reviewer` 子代理进行结构化审查，确保代码质量和计划一致性
+15. **完成验证**：使用 `verification-before-completion` 技能，在声称完成前运行验证命令并确认输出
+
+## 代码风格全局一致规则（最高优先级，强制执行）
+
+> **核心原则：编写任何新模块/新文件的代码前，必须先阅读同层级现有模块的实际代码，严格复制其风格，禁止引入不存在的 API、封装或模式。**
+
+### 执行流程（强制）
+
+1. **写代码前**：先用 Read/Grep 工具读取同类型现有文件（如写新 Controller 前先读 `im_controller.go` 和 `contact_controller.go`）
+2. **写代码时**：逐行对照现有代码的导入、结构体定义、方法签名、日志调用、错误处理模式
+3. **写代码后**：与参照文件做差异比对，确认风格完全一致
+
+### Go 后端各层代码风格（以实际代码为准）
+
+详细的风格规范和代码模板见 `docs/conventions/backend-module-architecture.md`。以下是关键约定摘要：
+
+| 层级 | 接收器 | 日志 | funcName | 错误处理 |
+|------|--------|------|----------|---------|
+| Controller（前台业务） | `ctl` | 不记日志 | 无 | 方法级 `handleError` |
+| Controller（auth/admin） | `ctrl`/`ctl` | 有日志 | 有 | `handleAuthError` 包级函数 / 内联 |
+| Service | `s` | `logs.Info/Debug/Error` | `"service.{file}.{Method}"` | 包顶部 `var ErrXxx` |
+| DAO | `d` | `logs.Info/Debug/Error` | `"dao.{file}.{Method}"` | `logs.Error` + 返回 err |
+
+### 日志 API（以实际代码为准）
+
+项目中 logs 包只有 `logs.Info/Debug/Warn/Error/Fatal` 五个方法，签名为 `logs.Xxx(ctx, funcName, message, ...zap.Field)`。
+**不存在** `logs.LogFunctionEntry` / `logs.LogFunctionExit` / `logs.LogSuccess` 等方法，**严禁使用不存在的 API**。
+
+### 依赖管理
+
+- **禁止随意拉取最新版本的依赖包**，必须选择与当前 Go 版本（go.mod 中的 `go` 指令）兼容的版本
+- **禁止触发 Go 工具链自动升级**，如果某依赖要求更高版本的 Go，必须选择兼容版本而非升级 Go
+- 添加依赖前先检查 go.mod 中的 Go 版本和已有依赖，优先复用已有依赖
+
+### 前端代码风格
+
+- 前端新页面/组件/Store 的编写，同样必须先阅读现有同类文件，严格遵循已有的代码结构、命名规范、状态管理模式
+- 禁止引入项目中未使用的新 UI 框架、状态管理库或工具函数库

 ## 文档自动同步规则（强制执行）

--- a/admin/src/api/group.js
+++ b/admin/src/api/group.js
@@ -0,0 +1,52 @@
+/**
+ * 群组管理 API 模块（管理端）
+ *
+ * 对应后端路由：/api/v1/admin/groups/*
+ * 所有接口需要 JWT + admin 角色权限
+ *
+ * 接口列表：
+ * - GET    /api/v1/admin/groups       群组列表（分页 + 搜索）
+ * - GET    /api/v1/admin/groups/:id   群组详情（含成员列表）
+ * - DELETE /api/v1/admin/groups/:id   解散群聊
+ */
+import request from '@/utils/request'
+
+/**
+ * 获取群组列表
+ * @param {Object} params - 查询参数
+ * @param {number} params.page - 页码（从 1 开始）
+ * @param {number} params.page_size - 每页数量
+ * @param {string} [params.keyword] - 搜索关键词（群名称）
+ * @returns {Promise<{data: {total: number, list: Array}}>}
+ */
+export function getGroupList(params) {
+  return request({
+    url: '/api/v1/admin/groups',
+    method: 'get',
+    params
+  })
+}
+
+/**
+ * 获取群组详情（含成员列表）
+ * @param {number} id - 群组 ID
+ * @returns {Promise<{data: Object}>}
+ */
+export function getGroupDetail(id) {
+  return request({
+    url: `/api/v1/admin/groups/${id}`,
+    method: 'get'
+  })
+}
+
+/**
+ * 解散群聊
+ * @param {number} id - 群组 ID
+ * @returns {Promise}
+ */
+export function dissolveGroup(id) {
+  return request({
+    url: `/api/v1/admin/groups/${id}`,
+    method: 'delete'
+  })
+}
--- a/admin/src/router/index.js
+++ b/admin/src/router/index.js
@@ -56,6 +56,12 @@ const routes = [
        name: 'ContactManage',
        component: () => import('@/views/contact/list.vue'),
        meta: { title: '好友管理' }
+      },
+      {
+        path: 'group/list',
+        name: 'GroupManage',
+        component: () => import('@/views/group/list.vue'),
+        meta: { title: '群组管理' }
      }
    ]
  }
--- a/admin/src/views/group/list.vue
+++ b/admin/src/views/group/list.vue
@@ -0,0 +1,322 @@
+<!--
+  管理端群组列表页面
+
+  设计系统：Data-Dense Dashboard 风格（与用户列表页保持一致）
+
+  功能：
+  - 搜索框（群名称关键词搜索）
+  - 群组数据表格（Element Plus Table）
+  - 分页组件
+  - 操作按钮（查看详情、解散群聊）
+
+  对应后端 API：GET /api/v1/admin/groups
+-->
+<template>
+  <div class="group-list-page">
+    <!-- 页面标题 -->
+    <div class="page-header">
+      <h2 class="page-title">群组管理</h2>
+    </div>
+
+    <!-- 搜索区 -->
+    <el-card class="filter-card" shadow="never">
+      <el-form :inline="true" class="filter-form" @submit.prevent="handleSearch">
+        <el-form-item label="关键词">
+          <el-input
+            v-model="searchKeyword"
+            placeholder="搜索群名称"
+            clearable
+            style="width: 240px"
+            @clear="handleSearch"
+          >
+            <template #prefix>
+              <el-icon><Search /></el-icon>
+            </template>
+          </el-input>
+        </el-form-item>
+
+        <el-form-item>
+          <el-button type="primary" @click="handleSearch">搜索</el-button>
+          <el-button @click="handleReset">重置</el-button>
+        </el-form-item>
+      </el-form>
+    </el-card>
+
+    <!-- 群组数据表格 -->
+    <el-card class="table-card" shadow="never">
+      <el-table
+        v-loading="loading"
+        :data="groupList"
+        stripe
+        border
+        style="width: 100%"
+        row-class-name="table-row"
+      >
+        <el-table-column prop="id" label="ID" width="80" align="center" />
+
+        <el-table-column prop="name" label="群名称" min-width="160">
+          <template #default="{ row }">
+            <span class="group-name-cell">{{ row.name }}</span>
+          </template>
+        </el-table-column>
+
+        <el-table-column prop="owner_name" label="群主" min-width="120" />
+
+        <el-table-column label="成员" width="100" align="center">
+          <template #default="{ row }">
+            <span>{{ row.member_count }}/{{ row.max_members }}</span>
+          </template>
+        </el-table-column>
+
+        <el-table-column label="状态" width="100" align="center">
+          <template #default="{ row }">
+            <el-tag v-if="row.status === 1" type="success" size="small">正常</el-tag>
+            <el-tag v-else-if="row.status === 2" type="danger" size="small">已解散</el-tag>
+          </template>
+        </el-table-column>
+
+        <el-table-column label="全体禁言" width="100" align="center">
+          <template #default="{ row }">
+            <el-tag v-if="row.is_all_muted" type="warning" size="small">是</el-tag>
+            <el-tag v-else type="info" size="small">否</el-tag>
+          </template>
+        </el-table-column>
+
+        <el-table-column prop="created_at" label="创建时间" width="180" align="center" />
+
+        <el-table-column label="操作" width="200" align="center" fixed="right">
+          <template #default="{ row }">
+            <el-button type="primary" link size="small" @click="viewDetail(row)">
+              详情
+            </el-button>
+            <el-button
+              v-if="row.status === 1"
+              type="danger"
+              link
+              size="small"
+              @click="handleDissolve(row)"
+            >
+              解散
+            </el-button>
+          </template>
+        </el-table-column>
+      </el-table>
+
+      <!-- 分页 -->
+      <div class="pagination-wrapper">
+        <el-pagination
+          v-model:current-page="currentPage"
+          v-model:page-size="pageSize"
+          :page-sizes="[10, 20, 50]"
+          :total="total"
+          layout="total, sizes, prev, pager, next, jumper"
+          @size-change="fetchGroupList"
+          @current-change="fetchGroupList"
+        />
+      </div>
+    </el-card>
+
+    <!-- 群组详情弹窗 -->
+    <el-dialog v-model="detailVisible" title="群组详情" width="700px" destroy-on-close>
+      <div v-loading="detailLoading">
+        <template v-if="currentGroup">
+          <el-descriptions :column="2" border>
+            <el-descriptions-item label="群 ID">{{ currentGroup.id }}</el-descriptions-item>
+            <el-descriptions-item label="会话 ID">{{ currentGroup.conversation_id }}</el-descriptions-item>
+            <el-descriptions-item label="群名称">{{ currentGroup.name }}</el-descriptions-item>
+            <el-descriptions-item label="群主">{{ currentGroup.owner_name }}</el-descriptions-item>
+            <el-descriptions-item label="成员数">{{ currentGroup.member_count }}/{{ currentGroup.max_members }}</el-descriptions-item>
+            <el-descriptions-item label="状态">
+              <el-tag v-if="currentGroup.status === 1" type="success" size="small">正常</el-tag>
+              <el-tag v-else type="danger" size="small">已解散</el-tag>
+            </el-descriptions-item>
+            <el-descriptions-item label="全体禁言">
+              <el-tag v-if="currentGroup.is_all_muted" type="warning" size="small">是</el-tag>
+              <el-tag v-else type="info" size="small">否</el-tag>
+            </el-descriptions-item>
+            <el-descriptions-item label="可搜索">
+              {{ currentGroup.is_searchable ? '是' : '否' }}
+            </el-descriptions-item>
+            <el-descriptions-item label="创建时间" :span="2">{{ currentGroup.created_at }}</el-descriptions-item>
+            <el-descriptions-item label="群公告" :span="2">
+              {{ currentGroup.notice || '暂无公告' }}
+            </el-descriptions-item>
+          </el-descriptions>
+
+          <!-- 成员列表 -->
+          <h4 class="member-title">群成员（{{ currentGroup.members?.length || 0 }}）</h4>
+          <el-table :data="currentGroup.members || []" stripe border max-height="300" size="small">
+            <el-table-column prop="user_id" label="用户 ID" width="80" align="center" />
+            <el-table-column prop="username" label="用户名" min-width="120" />
+            <el-table-column prop="nickname" label="群昵称" min-width="120">
+              <template #default="{ row }">
+                {{ row.nickname || '-' }}
+              </template>
+            </el-table-column>
+            <el-table-column label="角色" width="100" align="center">
+              <template #default="{ row }">
+                <el-tag v-if="row.role === 2" type="danger" size="small">群主</el-tag>
+                <el-tag v-else-if="row.role === 1" type="warning" size="small">管理员</el-tag>
+                <el-tag v-else type="info" size="small">成员</el-tag>
+              </template>
+            </el-table-column>
+            <el-table-column label="禁言" width="80" align="center">
+              <template #default="{ row }">
+                <el-tag v-if="row.is_muted" type="danger" size="small">是</el-tag>
+                <span v-else>-</span>
+              </template>
+            </el-table-column>
+            <el-table-column prop="joined_at" label="加入时间" width="160" align="center" />
+          </el-table>
+        </template>
+      </div>
+    </el-dialog>
+  </div>
+</template>
+
+<script setup>
+/**
+ * 管理端群组列表逻辑
+ *
+ * 数据流：API → 列表渲染 → 分页 / 搜索 → 详情弹窗
+ */
+import { ref, onMounted } from 'vue'
+import { Search } from '@element-plus/icons-vue'
+import { ElMessage, ElMessageBox } from 'element-plus'
+import { getGroupList, getGroupDetail, dissolveGroup } from '@/api/group'
+
+const loading = ref(false)
+const groupList = ref([])
+const total = ref(0)
+const currentPage = ref(1)
+const pageSize = ref(20)
+const searchKeyword = ref('')
+
+const detailVisible = ref(false)
+const detailLoading = ref(false)
+const currentGroup = ref(null)
+
+/** 获取群组列表 */
+const fetchGroupList = async () => {
+  loading.value = true
+  try {
+    const res = await getGroupList({
+      page: currentPage.value,
+      page_size: pageSize.value,
+      keyword: searchKeyword.value || undefined
+    })
+    groupList.value = res.data?.list || []
+    total.value = res.data?.total || 0
+  } catch (e) {
+    ElMessage.error(e?.data?.message || '获取群组列表失败')
+  } finally {
+    loading.value = false
+  }
+}
+
+/** 搜索 */
+const handleSearch = () => {
+  currentPage.value = 1
+  fetchGroupList()
+}
+
+/** 重置搜索条件 */
+const handleReset = () => {
+  searchKeyword.value = ''
+  currentPage.value = 1
+  fetchGroupList()
+}
+
+/** 查看群组详情 */
+const viewDetail = async (row) => {
+  detailVisible.value = true
+  detailLoading.value = true
+  currentGroup.value = null
+  try {
+    const res = await getGroupDetail(row.id)
+    currentGroup.value = res.data
+  } catch (e) {
+    ElMessage.error(e?.data?.message || '获取群组详情失败')
+  } finally {
+    detailLoading.value = false
+  }
+}
+
+/** 解散群聊（二次确认） */
+const handleDissolve = (row) => {
+  ElMessageBox.confirm(
+    `确定要解散群聊「${row.name}」吗？此操作不可恢复。`,
+    '解散群聊',
+    { confirmButtonText: '确定解散', cancelButtonText: '取消', type: 'warning' }
+  ).then(async () => {
+    try {
+      await dissolveGroup(row.id)
+      ElMessage.success('群聊已解散')
+      fetchGroupList()
+    } catch (e) {
+      ElMessage.error(e?.data?.message || '解散群聊失败')
+    }
+  }).catch(() => {})
+}
+
+onMounted(() => {
+  fetchGroupList()
+})
+</script>
+
+<style scoped>
+.group-list-page {
+  padding: 0;
+}
+
+.page-header {
+  display: flex;
+  justify-content: space-between;
+  align-items: center;
+  margin-bottom: 16px;
+}
+
+.page-title {
+  font-size: 20px;
+  font-weight: 600;
+  color: #1E293B;
+  margin: 0;
+}
+
+.filter-card {
+  margin-bottom: 16px;
+}
+
+.filter-form {
+  display: flex;
+  align-items: center;
+  flex-wrap: wrap;
+  gap: 8px;
+}
+
+.table-card {
+  margin-bottom: 16px;
+}
+
+.group-name-cell {
+  font-weight: 500;
+  color: #1E293B;
+}
+
+.pagination-wrapper {
+  display: flex;
+  justify-content: flex-end;
+  padding-top: 16px;
+}
+
+.table-row {
+  cursor: default;
+}
+
+.member-title {
+  margin: 20px 0 12px;
+  font-size: 15px;
+  font-weight: 600;
+  color: #1E293B;
+}
+</style>
--- a/admin/src/views/layout/index.vue
+++ b/admin/src/views/layout/index.vue
@@ -48,6 +48,14 @@
          <el-menu-item index="/contact/list">好友关系</el-menu-item>
        </el-sub-menu>

+        <el-sub-menu index="group-manage">
+          <template #title>
+            <el-icon><ChatDotSquare /></el-icon>
+            <span>群组管理</span>
+          </template>
+          <el-menu-item index="/group/list">群组列表</el-menu-item>
+        </el-sub-menu>
+
        <el-menu-item index="/monitor/online">
          <el-icon><Monitor /></el-icon>
          <template #title>在线监控</template>
--- a/backend/go-service/app/admin/controller/group_manage_controller.go
+++ b/backend/go-service/app/admin/controller/group_manage_controller.go
@@ -0,0 +1,94 @@
+// Package controller 提供 admin 模块的 HTTP 接口处理
+package controller
+
+import (
+	"strconv"
+
+	"github.com/echochat/backend/app/admin/service"
+	"github.com/echochat/backend/pkg/logs"
+	"github.com/echochat/backend/pkg/utils"
+	"github.com/gin-gonic/gin"
+	"go.uber.org/zap"
+)
+
+// GroupManageController 管理端群组管理控制器
+type GroupManageController struct {
+	groupManageService *service.GroupManageService
+}
+
+// NewGroupManageController 创建群组管理控制器实例
+func NewGroupManageController(svc *service.GroupManageService) *GroupManageController {
+	return &GroupManageController{groupManageService: svc}
+}
+
+// GetGroupList 获取群组列表
+// GET /api/v1/admin/groups?page=1&page_size=20&keyword=xxx
+func (ctl *GroupManageController) GetGroupList(c *gin.Context) {
+	funcName := "admin.group_manage_controller.GetGroupList"
+	ctx := c.Request.Context()
+
+	page, _ := strconv.Atoi(c.DefaultQuery("page", "1"))
+	pageSize, _ := strconv.Atoi(c.DefaultQuery("page_size", "20"))
+	keyword := c.Query("keyword")
+
+	list, total, err := ctl.groupManageService.ListGroups(ctx, page, pageSize, keyword)
+	if err != nil {
+		logs.Error(ctx, funcName, "获取群组列表失败", zap.Error(err))
+		utils.ResponseError(c, "获取群组列表失败")
+		return
+	}
+
+	logs.Info(ctx, funcName, "获取群组列表成功",
+		zap.Int64("total", total), zap.Int("page", page))
+	utils.ResponseOK(c, gin.H{
+		"list":  list,
+		"total": total,
+	})
+}
+
+// GetGroupDetail 获取群组详情
+// GET /api/v1/admin/groups/:id
+func (ctl *GroupManageController) GetGroupDetail(c *gin.Context) {
+	funcName := "admin.group_manage_controller.GetGroupDetail"
+	ctx := c.Request.Context()
+
+	id, err := strconv.ParseInt(c.Param("id"), 10, 64)
+	if err != nil {
+		utils.ResponseBadRequest(c, "ID 格式错误")
+		return
+	}
+
+	detail, err := ctl.groupManageService.GetGroupDetail(ctx, id)
+	if err != nil {
+		logs.Error(ctx, funcName, "获取群组详情失败",
+			zap.Int64("group_id", id), zap.Error(err))
+		utils.ResponseError(c, "获取群组详情失败")
+		return
+	}
+
+	logs.Info(ctx, funcName, "获取群组详情成功", zap.Int64("group_id", id))
+	utils.ResponseOK(c, detail)
+}
+
+// DissolveGroup 解散群聊
+// DELETE /api/v1/admin/groups/:id
+func (ctl *GroupManageController) DissolveGroup(c *gin.Context) {
+	funcName := "admin.group_manage_controller.DissolveGroup"
+	ctx := c.Request.Context()
+
+	id, err := strconv.ParseInt(c.Param("id"), 10, 64)
+	if err != nil {
+		utils.ResponseBadRequest(c, "ID 格式错误")
+		return
+	}
+
+	if err := ctl.groupManageService.DissolveGroup(ctx, id); err != nil {
+		logs.Error(ctx, funcName, "解散群聊失败",
+			zap.Int64("group_id", id), zap.Error(err))
+		utils.ResponseError(c, "解散群聊失败")
+		return
+	}
+
+	logs.Info(ctx, funcName, "解散群聊成功", zap.Int64("group_id", id))
+	utils.ResponseOK(c, nil)
+}
--- a/backend/go-service/app/admin/provider.go
+++ b/backend/go-service/app/admin/provider.go
@@ -18,4 +18,6 @@ var AdminSet = wire.NewSet(
 	controller.NewOnlineController,
 	service.NewContactManageService,
 	controller.NewContactManageController,
+	service.NewGroupManageService,
+	controller.NewGroupManageController,
 )
--- a/backend/go-service/app/admin/router.go
+++ b/backend/go-service/app/admin/router.go
@@ -15,6 +15,7 @@ func RegisterRoutes(
 	userCtrl *controller.UserManageController,
 	onlineCtrl *controller.OnlineController,
 	contactManageCtrl *controller.ContactManageController,
+	groupManageCtrl *controller.GroupManageController,
 	jwtAuth gin.HandlerFunc,
 ) {
 	// 管理端路由组：JWT 认证 + admin/super_admin 角色检查
@@ -38,5 +39,10 @@ func RegisterRoutes(
 		// 好友关系管理
 		adminGroup.GET("/contacts", contactManageCtrl.GetAllContacts)
 		adminGroup.DELETE("/contacts/:id", contactManageCtrl.DeleteContact)
+
+		// 群组管理
+		adminGroup.GET("/groups", groupManageCtrl.GetGroupList)
+		adminGroup.GET("/groups/:id", groupManageCtrl.GetGroupDetail)
+		adminGroup.DELETE("/groups/:id", groupManageCtrl.DissolveGroup)
 	}
 }
--- a/backend/go-service/app/admin/service/group_manage_service.go
+++ b/backend/go-service/app/admin/service/group_manage_service.go
@@ -0,0 +1,247 @@
+// Package service 提供 admin 模块的核心业务逻辑
+package service
+
+import (
+	"context"
+	"math"
+	"strconv"
+
+	groupDAO "github.com/echochat/backend/app/group/dao"
+	groupModel "github.com/echochat/backend/app/group/model"
+	"github.com/echochat/backend/pkg/logs"
+	"go.uber.org/zap"
+	"gorm.io/gorm"
+)
+
+// GroupManageService 管理端群组管理服务
+type GroupManageService struct {
+	db       *gorm.DB
+	groupDAO *groupDAO.GroupDAO
+}
+
+// NewGroupManageService 创建群组管理服务实例
+func NewGroupManageService(db *gorm.DB, groupDAO *groupDAO.GroupDAO) *GroupManageService {
+	return &GroupManageService{db: db, groupDAO: groupDAO}
+}
+
+// GroupListItem 管理端群组列表项
+type GroupListItem struct {
+	ID             int64  `json:"id"`
+	ConversationID int64  `json:"conversation_id"`
+	Name           string `json:"name"`
+	Avatar         string `json:"avatar"`
+	OwnerID        int64  `json:"owner_id"`
+	OwnerName      string `json:"owner_name"`
+	MemberCount    int64  `json:"member_count"`
+	MaxMembers     int    `json:"max_members"`
+	Status         int    `json:"status"`
+	IsAllMuted     bool   `json:"is_all_muted"`
+	CreatedAt      string `json:"created_at"`
+}
+
+// GroupDetailInfo 管理端群组详情
+type GroupDetailInfo struct {
+	GroupListItem
+	Notice     string            `json:"notice"`
+	IsSearchable bool            `json:"is_searchable"`
+	Members    []GroupMemberInfo `json:"members"`
+}
+
+// GroupMemberInfo 群成员信息
+type GroupMemberInfo struct {
+	UserID   int64  `json:"user_id"`
+	Username string `json:"username"`
+	Nickname string `json:"nickname"`
+	Role     int    `json:"role"`
+	IsMuted  bool   `json:"is_muted"`
+	JoinedAt string `json:"joined_at"`
+}
+
+// ListGroups 获取群组列表（分页 + 搜索）
+func (s *GroupManageService) ListGroups(ctx context.Context, page, pageSize int, keyword string) ([]GroupListItem, int64, error) {
+	funcName := "service.group_manage_service.ListGroups"
+	logs.Info(ctx, funcName, "获取群组列表",
+		zap.Int("page", page), zap.Int("page_size", pageSize), zap.String("keyword", keyword))
+
+	if page < 1 {
+		page = 1
+	}
+	if pageSize < 1 || pageSize > 100 {
+		pageSize = 20
+	}
+
+	offset := (page - 1) * pageSize
+
+	var groups []groupModel.Group
+	var total int64
+
+	query := s.db.WithContext(ctx).Model(&groupModel.Group{})
+	if keyword != "" {
+		query = query.Where("name ILIKE ?", "%"+keyword+"%")
+	}
+
+	if err := query.Count(&total).Error; err != nil {
+		return nil, 0, err
+	}
+
+	if err := query.Order("created_at DESC").Offset(offset).Limit(pageSize).Find(&groups).Error; err != nil {
+		return nil, 0, err
+	}
+
+	// 批量查询群主名称，避免 N+1
+	ownerIDs := make([]int64, 0, len(groups))
+	convIDs := make([]int64, 0, len(groups))
+	for _, g := range groups {
+		ownerIDs = append(ownerIDs, g.OwnerID)
+		convIDs = append(convIDs, g.ConversationID)
+	}
+	ownerNameMap := s.batchGetUsernames(ctx, ownerIDs)
+	memberCountMap := s.batchGetMemberCounts(ctx, convIDs)
+
+	list := make([]GroupListItem, 0, len(groups))
+	for _, g := range groups {
+		list = append(list, GroupListItem{
+			ID:             g.ID,
+			ConversationID: g.ConversationID,
+			Name:           g.Name,
+			Avatar:         g.Avatar,
+			OwnerID:        g.OwnerID,
+			OwnerName:      ownerNameMap[g.OwnerID],
+			MemberCount:    memberCountMap[g.ConversationID],
+			MaxMembers:     g.MaxMembers,
+			Status:         g.Status,
+			IsAllMuted:     g.IsAllMuted,
+			CreatedAt:      g.CreatedAt.Format("2006-01-02 15:04:05"),
+		})
+	}
+
+	totalPages := int(math.Ceil(float64(total) / float64(pageSize)))
+	logs.Info(ctx, funcName, "获取群组列表成功",
+		zap.Int64("total", total), zap.Int("total_pages", totalPages))
+
+	return list, total, nil
+}
+
+// GetGroupDetail 获取群组详情（含成员列表）
+func (s *GroupManageService) GetGroupDetail(ctx context.Context, groupID int64) (*GroupDetailInfo, error) {
+	funcName := "service.group_manage_service.GetGroupDetail"
+	logs.Info(ctx, funcName, "获取群组详情", zap.Int64("group_id", groupID))
+
+	group, err := s.groupDAO.GetByID(ctx, groupID)
+	if err != nil {
+		return nil, err
+	}
+
+	memberCount, _ := s.groupDAO.GetMemberCount(ctx, group.ConversationID)
+	ownerName := s.getUsername(ctx, group.OwnerID)
+
+	members, err := s.groupDAO.GetMembers(ctx, group.ConversationID)
+	if err != nil {
+		return nil, err
+	}
+
+	memberInfos := make([]GroupMemberInfo, 0, len(members))
+	for _, m := range members {
+		username := s.getUsername(ctx, m.UserID)
+		memberInfos = append(memberInfos, GroupMemberInfo{
+			UserID:   m.UserID,
+			Username: username,
+			Nickname: m.Nickname,
+			Role:     m.Role,
+			IsMuted:  m.IsMuted,
+			JoinedAt: m.JoinedAt.Format("2006-01-02 15:04:05"),
+		})
+	}
+
+	detail := &GroupDetailInfo{
+		GroupListItem: GroupListItem{
+			ID:             group.ID,
+			ConversationID: group.ConversationID,
+			Name:           group.Name,
+			Avatar:         group.Avatar,
+			OwnerID:        group.OwnerID,
+			OwnerName:      ownerName,
+			MemberCount:    memberCount,
+			MaxMembers:     group.MaxMembers,
+			Status:         group.Status,
+			IsAllMuted:     group.IsAllMuted,
+			CreatedAt:      group.CreatedAt.Format("2006-01-02 15:04:05"),
+		},
+		Notice:       group.Notice,
+		IsSearchable: group.IsSearchable,
+		Members:      memberInfos,
+	}
+
+	return detail, nil
+}
+
+// DissolveGroup 管理端解散群聊
+func (s *GroupManageService) DissolveGroup(ctx context.Context, groupID int64) error {
+	funcName := "service.group_manage_service.DissolveGroup"
+	logs.Info(ctx, funcName, "管理端解散群聊", zap.Int64("group_id", groupID))
+	return s.groupDAO.DissolveGroup(ctx, groupID)
+}
+
+// getUsername 通过用户 ID 获取用户名（优先昵称，其次用户名）
+func (s *GroupManageService) getUsername(ctx context.Context, userID int64) string {
+	var username string
+	s.db.WithContext(ctx).Table("auth_users").
+		Where("id = ?", userID).
+		Pluck("COALESCE(NULLIF(nickname, ''), username)", &username)
+	if username == "" {
+		return strconv.FormatInt(userID, 10)
+	}
+	return username
+}
+
+// batchGetUsernames 批量查询用户名，返回 userID → 显示名 映射
+func (s *GroupManageService) batchGetUsernames(ctx context.Context, userIDs []int64) map[int64]string {
+	result := make(map[int64]string, len(userIDs))
+	if len(userIDs) == 0 {
+		return result
+	}
+
+	type row struct {
+		ID       int64  `gorm:"column:id"`
+		Username string `gorm:"column:display_name"`
+	}
+	var rows []row
+	s.db.WithContext(ctx).Table("auth_users").
+		Select("id, COALESCE(NULLIF(nickname, ''), username) AS display_name").
+		Where("id IN ?", userIDs).
+		Find(&rows)
+
+	for _, r := range rows {
+		result[r.ID] = r.Username
+	}
+	for _, uid := range userIDs {
+		if _, ok := result[uid]; !ok {
+			result[uid] = strconv.FormatInt(uid, 10)
+		}
+	}
+	return result
+}
+
+// batchGetMemberCounts 批量查询会话的成员数，返回 conversationID → count 映射
+func (s *GroupManageService) batchGetMemberCounts(ctx context.Context, conversationIDs []int64) map[int64]int64 {
+	result := make(map[int64]int64, len(conversationIDs))
+	if len(conversationIDs) == 0 {
+		return result
+	}
+
+	type row struct {
+		ConversationID int64 `gorm:"column:conversation_id"`
+		Count          int64 `gorm:"column:cnt"`
+	}
+	var rows []row
+	s.db.WithContext(ctx).Table("im_conversation_members").
+		Select("conversation_id, COUNT(*) AS cnt").
+		Where("conversation_id IN ?", conversationIDs).
+		Group("conversation_id").
+		Find(&rows)
+
+	for _, r := range rows {
+		result[r.ConversationID] = r.Count
+	}
+	return result
+}
--- a/backend/go-service/app/constants/group.go
+++ b/backend/go-service/app/constants/group.go
@@ -0,0 +1,46 @@
+package constants
+
+// 群聊状态
+const (
+	GroupStatusNormal    = 1 // 正常
+	GroupStatusDissolved = 2 // 已解散
+)
+
+// GroupStatusMap 群聊状态中文映射
+var GroupStatusMap = map[int]string{
+	GroupStatusNormal:    "正常",
+	GroupStatusDissolved: "已解散",
+}
+
+// 群成员角色（im_conversation_members.role）
+const (
+	GroupRoleNormal = 0 // 普通成员
+	GroupRoleAdmin  = 1 // 管理员
+	GroupRoleOwner  = 2 // 群主
+)
+
+// GroupRoleMap 群成员角色中文映射
+var GroupRoleMap = map[int]string{
+	GroupRoleNormal: "普通成员",
+	GroupRoleAdmin:  "管理员",
+	GroupRoleOwner:  "群主",
+}
+
+// 入群申请状态（im_group_join_requests.status）
+const (
+	JoinRequestStatusPending  = 0 // 待审批
+	JoinRequestStatusApproved = 1 // 通过
+	JoinRequestStatusRejected = 2 // 拒绝
+)
+
+// JoinRequestStatusMap 入群申请状态中文映射
+var JoinRequestStatusMap = map[int]string{
+	JoinRequestStatusPending:  "待审批",
+	JoinRequestStatusApproved: "通过",
+	JoinRequestStatusRejected: "拒绝",
+}
+
+// 群聊默认配置
+const (
+	GroupDefaultMaxMembers = 200 // 默认最大成员数
+)
--- a/backend/go-service/app/constants/im.go
+++ b/backend/go-service/app/constants/im.go
@@ -19,6 +19,7 @@ const (
 	MessageTypeVoice  = 3  // 语音消息（预留）
 	MessageTypeVideo  = 4  // 视频消息（预留）
 	MessageTypeFile   = 5  // 文件消息（预留）
+	MessageTypeSystem = 10 // 系统消息（群聊操作通知）
 )

 // MessageTypeMap 消息类型中文映射
@@ -28,6 +29,7 @@ var MessageTypeMap = map[int]string{
 	MessageTypeVoice:  "语音",
 	MessageTypeVideo:  "视频",
 	MessageTypeFile:   "文件",
+	MessageTypeSystem: "系统消息",
 }

 // 消息状态
--- a/backend/go-service/app/dto/group_dto.go
+++ b/backend/go-service/app/dto/group_dto.go
@@ -0,0 +1,177 @@
+package dto
+
+// ====== 群聊管理 DTO ======
+
+// CreateGroupRequest 创建群聊请求
+// POST /api/v1/groups
+type CreateGroupRequest struct {
+	Name      string  `json:"name" binding:"required,max=100"`  // 群名称
+	MemberIDs []int64 `json:"member_ids" binding:"required"`    // 初始成员用户 ID 列表（不含创建者自身）
+	Avatar    string  `json:"avatar"`                           // 群头像 URL（可选）
+}
+
+// UpdateGroupRequest 更新群信息请求
+// PUT /api/v1/groups/:id
+type UpdateGroupRequest struct {
+	Name         *string `json:"name"`          // 群名称
+	Avatar       *string `json:"avatar"`        // 群头像 URL
+	Notice       *string `json:"notice"`        // 群公告
+	IsSearchable *bool   `json:"is_searchable"` // 是否可被搜索
+}
+
+// GroupDTO 群聊信息传输对象（返回给前端）
+type GroupDTO struct {
+	ID             int64  `json:"id"`              // 群 ID
+	ConversationID int64  `json:"conversation_id"` // 关联会话 ID
+	Name           string `json:"name"`            // 群名称
+	Avatar         string `json:"avatar"`          // 群头像
+	OwnerID        int64  `json:"owner_id"`        // 群主用户 ID
+	Notice         string `json:"notice"`          // 群公告
+	MaxMembers     int    `json:"max_members"`     // 最大成员数
+	MemberCount    int    `json:"member_count"`    // 当前成员数
+	IsSearchable   bool   `json:"is_searchable"`   // 是否可被搜索
+	IsAllMuted     bool   `json:"is_all_muted"`    // 是否全体禁言
+	Status         int    `json:"status"`          // 群状态：1=正常，2=已解散
+	CreatedAt      string `json:"created_at"`      // 创建时间
+}
+
+// ====== 群成员 DTO ======
+
+// GroupMemberDTO 群成员信息传输对象
+type GroupMemberDTO struct {
+	UserID         int64  `json:"user_id"`          // 用户 ID
+	Nickname       string `json:"nickname"`         // 群内昵称
+	UserNickname   string `json:"user_nickname"`    // 用户原始昵称
+	Avatar         string `json:"avatar"`           // 用户头像
+	Role           int    `json:"role"`             // 角色：0=普通成员，1=管理员，2=群主
+	IsMuted        bool   `json:"is_muted"`         // 是否被禁言
+	JoinedAt       string `json:"joined_at"`        // 加入时间
+}
+
+// InviteMembersRequest 邀请入群请求
+// POST /api/v1/groups/:id/members
+type InviteMembersRequest struct {
+	UserIDs []int64 `json:"user_ids" binding:"required"` // 被邀请的用户 ID 列表
+}
+
+// SetRoleRequest 设置/取消管理员请求
+// PUT /api/v1/groups/:id/members/:uid/role
+type SetRoleRequest struct {
+	Role int `json:"role" binding:"oneof=0 1"` // 目标角色：0=普通成员，1=管理员
+}
+
+// MuteRequest 禁言/解除禁言请求
+// PUT /api/v1/groups/:id/members/:uid/mute
+type MuteRequest struct {
+	IsMuted bool `json:"is_muted"` // true=禁言, false=解除
+}
+
+// TransferOwnerRequest 转让群主请求
+// PUT /api/v1/groups/:id/transfer
+type TransferOwnerRequest struct {
+	NewOwnerID int64 `json:"new_owner_id" binding:"required"` // 新群主用户 ID
+}
+
+// UpdateNicknameRequest 修改群昵称请求
+// PUT /api/v1/groups/:id/members/me/nickname
+type UpdateNicknameRequest struct {
+	Nickname string `json:"nickname" binding:"max=50"` // 群内昵称
+}
+
+// ====== 入群申请 DTO ======
+
+// JoinGroupRequest 申请入群请求
+// POST /api/v1/groups/:id/join-requests
+type JoinGroupRequest struct {
+	Message string `json:"message"` // 申请附言
+}
+
+// ReviewJoinRequest 审批入群申请请求
+// PUT /api/v1/groups/:id/join-requests/:rid
+type ReviewJoinRequest struct {
+	Action string `json:"action" binding:"required,oneof=approve reject"` // 操作：approve=通过, reject=拒绝
+}
+
+// JoinRequestDTO 入群申请传输对象
+type JoinRequestDTO struct {
+	ID           int64  `json:"id"`            // 申请 ID
+	GroupID      int64  `json:"group_id"`      // 群 ID
+	UserID       int64  `json:"user_id"`       // 申请人用户 ID
+	UserNickname string `json:"user_nickname"` // 申请人昵称
+	UserAvatar   string `json:"user_avatar"`   // 申请人头像
+	Message      string `json:"message"`       // 申请附言
+	Status       int    `json:"status"`        // 状态：0=待审批，1=通过，2=拒绝
+	CreatedAt    string `json:"created_at"`    // 申请时间
+}
+
+// ====== 群搜索 DTO ======
+
+// SearchGroupRequest 搜索群聊请求
+// GET /api/v1/groups/search?keyword=xx&page=1&page_size=20
+type SearchGroupRequest struct {
+	Keyword  string `form:"keyword" binding:"required"` // 搜索关键词
+	Page     int    `form:"page"`                       // 页码（默认 1）
+	PageSize int    `form:"page_size"`                  // 每页数量（默认 20）
+}
+
+// SearchGroupResponse 搜索群聊响应
+type SearchGroupResponse struct {
+	List  []GroupDTO `json:"list"`  // 搜索结果
+	Total int64      `json:"total"` // 总数
+}
+
+// ====== 已读回执 DTO ======
+
+// MarkGroupReadRequest 群聊标记已读请求（WS 事件 im.message.read 的 data 字段）
+type MarkGroupReadRequest struct {
+	ConversationID int64   `json:"conversation_id"` // 会话 ID
+	MessageIDs     []int64 `json:"message_ids"`     // 已读消息 ID 列表
+}
+
+// MessageReadCountDTO 消息已读计数传输对象
+type MessageReadCountDTO struct {
+	MessageID int64 `json:"message_id"` // 消息 ID
+	ReadCount int   `json:"read_count"` // 已读人数
+}
+
+// MessageReadDetailDTO 消息已读详情传输对象
+type MessageReadDetailDTO struct {
+	UserID       int64  `json:"user_id"`       // 已读用户 ID
+	UserNickname string `json:"user_nickname"` // 用户昵称
+	UserAvatar   string `json:"user_avatar"`   // 用户头像
+	ReadAt       string `json:"read_at"`       // 已读时间
+}
+
+// GetReadDetailRequest 获取已读详情请求
+// GET /api/v1/im/messages/:id/reads?page=1&page_size=20
+type GetReadDetailRequest struct {
+	Page     int `form:"page"`      // 页码（默认 1）
+	PageSize int `form:"page_size"` // 每页数量（默认 20）
+}
+
+// GetReadDetailResponse 获取已读详情响应
+type GetReadDetailResponse struct {
+	ReadList   []MessageReadDetailDTO `json:"read_list"`   // 已读用户列表
+	UnreadList []MessageReadDetailDTO `json:"unread_list"` // 未读用户列表
+	ReadCount  int                    `json:"read_count"`  // 已读人数
+	TotalCount int                    `json:"total_count"` // 群成员总数（不含发送者）
+}
+
+// ====== 免打扰 DTO ======
+
+// SetDoNotDisturbRequest 设置/取消免打扰请求
+// PUT /api/v1/im/conversations/:id/dnd
+type SetDoNotDisturbRequest struct {
+	IsDoNotDisturb bool `json:"is_do_not_disturb"` // true=开启, false=关闭
+}
+
+// ====== 跨模块接口数据传输 ======
+
+// GroupBrief 群简要信息（IM 模块通过 GroupInfoGetter 接口获取）
+type GroupBrief struct {
+	ID         int64  `json:"id"`
+	Name       string `json:"name"`
+	Avatar     string `json:"avatar"`
+	IsAllMuted bool   `json:"is_all_muted"`
+	Status     int    `json:"status"`
+}
--- a/backend/go-service/app/dto/im_dto.go
+++ b/backend/go-service/app/dto/im_dto.go
@@ -9,6 +9,7 @@ type SendMessageRequest struct {
 	Type           int     `json:"type"`              // 消息类型：1=文本
 	Content        string  `json:"content"`           // 消息内容
 	ClientMsgID    string  `json:"client_msg_id"`     // 客户端消息唯一 ID，用于幂等去重
+	AtUserIDs      []int64 `json:"at_user_ids"`       // @提醒用户 ID 列表（含 0 表示 @所有人）
 }

 // MessageDTO 消息传输对象（返回给前端）
@@ -20,6 +21,7 @@ type MessageDTO struct {
 	Content        string  `json:"content"`         // 消息内容
 	Status         int     `json:"status"`          // 消息状态：1=正常，2=已撤回
 	ClientMsgID    string  `json:"client_msg_id"`   // 客户端消息 ID
+	AtUserIDs      []int64 `json:"at_user_ids"`     // @提醒用户 ID 列表
 	CreatedAt      string  `json:"created_at"`      // 发送时间
 }

@@ -33,15 +35,18 @@ type RecallMessageRequest struct {
 // ConversationDTO 会话列表条目（返回给前端）
 type ConversationDTO struct {
 	ID              int64  `json:"id"`                 // 会话 ID
-	Type            int    `json:"type"`              // 会话类型：1=单聊
-	PeerUserID      int64  `json:"peer_user_id"`      // 单聊对方用户 ID
-	PeerNickname    string `json:"peer_nickname"`     // 对方昵称
-	PeerAvatar      string `json:"peer_avatar"`       // 对方头像
+	Type            int    `json:"type"`               // 会话类型：1=单聊，2=群聊
+	PeerUserID      int64  `json:"peer_user_id"`       // 单聊对方用户 ID（群聊为 0）
+	PeerNickname    string `json:"peer_nickname"`      // 对方昵称（群聊时为群名称）
+	PeerAvatar      string `json:"peer_avatar"`        // 对方头像（群聊时为群头像）
 	LastMsgContent  string `json:"last_msg_content"`   // 最后消息预览
 	LastMsgTime     string `json:"last_msg_time"`      // 最后消息时间
 	LastMsgSenderID *int64 `json:"last_msg_sender_id"` // 最后消息发送者 ID
 	IsPinned        bool   `json:"is_pinned"`          // 是否置顶
 	UnreadCount     int    `json:"unread_count"`       // 未读消息数
+	GroupID         int64  `json:"group_id,omitempty"` // 群聊 ID（仅 type=2 有值）
+	IsDoNotDisturb  bool   `json:"is_do_not_disturb"`  // 是否免打扰
+	AtMeCount       int    `json:"at_me_count"`        // 被@提醒未读计数
 }

 // ConversationListResponse 会话列表响应
--- a/backend/go-service/app/file/controller/file_controller.go
+++ b/backend/go-service/app/file/controller/file_controller.go
@@ -0,0 +1,70 @@
+// Package controller 提供文件上传模块的 HTTP 接口处理
+package controller
+
+import (
+	"github.com/echochat/backend/app/file/service"
+	"github.com/echochat/backend/pkg/middleware"
+	"github.com/echochat/backend/pkg/utils"
+	"github.com/gin-gonic/gin"
+)
+
+const maxUploadSize = 10 << 20 // 10 MB
+
+// FileController 文件上传控制器
+type FileController struct {
+	fileService *service.FileService
+}
+
+// NewFileController 创建文件上传控制器
+func NewFileController(fileService *service.FileService) *FileController {
+	return &FileController{fileService: fileService}
+}
+
+// Upload 处理文件上传请求
+// POST /api/v1/upload
+// 支持 multipart/form-data，字段名为 "file"
+func (ctl *FileController) Upload(c *gin.Context) {
+	ctx := c.Request.Context()
+	_, ok := middleware.GetCurrentUserID(c)
+	if !ok {
+		utils.ResponseUnauthorized(c, "无法获取当前用户信息")
+		return
+	}
+
+	fileHeader, err := c.FormFile("file")
+	if err != nil {
+		utils.ResponseBadRequest(c, "请选择要上传的文件")
+		return
+	}
+
+	if fileHeader.Size > maxUploadSize {
+		utils.ResponseBadRequest(c, "文件大小不能超过 10MB")
+		return
+	}
+
+	result, err := ctl.fileService.Upload(ctx, fileHeader)
+	if err != nil {
+		ctl.handleError(c, err, "文件上传失败")
+		return
+	}
+
+	utils.ResponseOK(c, result)
+}
+
+// handleError 统一业务错误映射
+// 已知业务错误 → 返回 Service 层定义的具体提示
+// 未知错误 → 返回 fallbackMsg（未传则默认"服务器内部错误"）
+func (ctl *FileController) handleError(c *gin.Context, err error, fallbackMsg ...string) {
+	switch err {
+	case service.ErrFileOpen:
+		utils.ResponseBadRequest(c, err.Error())
+	case service.ErrUploadFailed:
+		utils.ResponseError(c, err.Error())
+	default:
+		msg := "服务器内部错误"
+		if len(fallbackMsg) > 0 && fallbackMsg[0] != "" {
+			msg = fallbackMsg[0]
+		}
+		utils.ResponseError(c, msg)
+	}
+}
--- a/backend/go-service/app/file/provider.go
+++ b/backend/go-service/app/file/provider.go
@@ -0,0 +1,14 @@
+// Package file 文件上传模块 Wire 依赖注入配置
+package file
+
+import (
+	"github.com/echochat/backend/app/file/controller"
+	"github.com/echochat/backend/app/file/service"
+	"github.com/google/wire"
+)
+
+// FileSet 文件上传模块 Wire Provider Set
+var FileSet = wire.NewSet(
+	service.NewFileService,
+	controller.NewFileController,
+)
--- a/backend/go-service/app/file/router.go
+++ b/backend/go-service/app/file/router.go
@@ -0,0 +1,16 @@
+// Package file 文件上传模块路由注册
+package file
+
+import (
+	"github.com/echochat/backend/app/file/controller"
+	"github.com/gin-gonic/gin"
+)
+
+// RegisterRoutes 注册文件上传模块的所有路由（需要 JWT 中间件）
+func RegisterRoutes(r *gin.Engine, ctrl *controller.FileController, jwtAuth gin.HandlerFunc) {
+	authed := r.Group("/api/v1")
+	authed.Use(jwtAuth)
+	{
+		authed.POST("/upload", ctrl.Upload)
+	}
+}
--- a/backend/go-service/app/file/service/file_service.go
+++ b/backend/go-service/app/file/service/file_service.go
@@ -0,0 +1,90 @@
+// Package service 提供文件上传模块的业务逻辑
+// 封装 MinIO 对象存储的上传操作，返回可访问的文件 URL
+package service
+
+import (
+	"context"
+	"errors"
+	"fmt"
+	"mime/multipart"
+	"path/filepath"
+	"strings"
+	"time"
+
+	"github.com/echochat/backend/config"
+	"github.com/echochat/backend/pkg/logs"
+	"github.com/google/uuid"
+	"github.com/minio/minio-go/v7"
+	"go.uber.org/zap"
+)
+
+var (
+	ErrFileOpen     = errors.New("打开上传文件失败")
+	ErrUploadFailed = errors.New("文件上传失败")
+)
+
+// FileService 文件上传服务
+type FileService struct {
+	minioClient *minio.Client
+	minioCfg    *config.MinioConfig
+}
+
+// NewFileService 创建文件上传服务实例
+func NewFileService(client *minio.Client, cfg *config.MinioConfig) *FileService {
+	return &FileService{
+		minioClient: client,
+		minioCfg:    cfg,
+	}
+}
+
+// UploadResult 文件上传结果
+type UploadResult struct {
+	URL      string `json:"url"`
+	FileName string `json:"file_name"`
+	Size     int64  `json:"size"`
+}
+
+// Upload 上传文件到 MinIO，返回文件访问 URL
+// 文件按日期目录组织：uploads/2026/03/04/{uuid}.{ext}
+func (s *FileService) Upload(ctx context.Context, fileHeader *multipart.FileHeader) (*UploadResult, error) {
+	funcName := "service.file_service.Upload"
+	logs.Info(ctx, funcName, "上传文件",
+		zap.String("file_name", fileHeader.Filename),
+		zap.Int64("size", fileHeader.Size))
+
+	file, err := fileHeader.Open()
+	if err != nil {
+		logs.Error(ctx, funcName, "打开上传文件失败", zap.Error(err))
+		return nil, ErrFileOpen
+	}
+	defer file.Close()
+
+	ext := strings.ToLower(filepath.Ext(fileHeader.Filename))
+	now := time.Now()
+	objectName := fmt.Sprintf("uploads/%s/%s%s", now.Format("2006/01/02"), uuid.New().String(), ext)
+
+	contentType := fileHeader.Header.Get("Content-Type")
+	if contentType == "" {
+		contentType = "application/octet-stream"
+	}
+
+	_, err = s.minioClient.PutObject(ctx, s.minioCfg.Bucket, objectName, file, fileHeader.Size, minio.PutObjectOptions{
+		ContentType: contentType,
+	})
+	if err != nil {
+		logs.Error(ctx, funcName, "上传文件到 MinIO 失败", zap.Error(err))
+		return nil, ErrUploadFailed
+	}
+
+	scheme := "http"
+	if s.minioCfg.UseSSL {
+		scheme = "https"
+	}
+	url := fmt.Sprintf("%s://%s/%s/%s", scheme, s.minioCfg.Endpoint, s.minioCfg.Bucket, objectName)
+
+	return &UploadResult{
+		URL:      url,
+		FileName: fileHeader.Filename,
+		Size:     fileHeader.Size,
+	}, nil
+}
--- a/backend/go-service/app/group/controller/group_controller.go
+++ b/backend/go-service/app/group/controller/group_controller.go
@@ -0,0 +1,542 @@
+// Package controller 提供 group 模块的 HTTP 接口处理
+package controller
+
+import (
+	"strconv"
+
+	"github.com/echochat/backend/app/dto"
+	"github.com/echochat/backend/app/group/service"
+	"github.com/echochat/backend/pkg/middleware"
+	"github.com/echochat/backend/pkg/utils"
+	"github.com/gin-gonic/gin"
+)
+
+// GroupController 群聊管理控制器（REST API）
+type GroupController struct {
+	groupService *service.GroupService
+}
+
+// NewGroupController 创建 GroupController 实例
+func NewGroupController(groupService *service.GroupService) *GroupController {
+	return &GroupController{groupService: groupService}
+}
+
+// CreateGroup 创建群聊
+// POST /api/v1/groups
+func (ctl *GroupController) CreateGroup(c *gin.Context) {
+	ctx := c.Request.Context()
+	userID, ok := middleware.GetCurrentUserID(c)
+	if !ok {
+		utils.ResponseUnauthorized(c, "无法获取当前用户信息")
+		return
+	}
+
+	var req dto.CreateGroupRequest
+	if err := c.ShouldBindJSON(&req); err != nil {
+		utils.ResponseBadRequest(c, "参数校验失败: "+err.Error())
+		return
+	}
+
+	result, err := ctl.groupService.CreateGroup(ctx, userID, &req)
+	if err != nil {
+		ctl.handleError(c, err, "创建群聊失败")
+		return
+	}
+	utils.ResponseOK(c, result)
+}
+
+// GetGroupDetail 获取群详情
+// GET /api/v1/groups/:id
+func (ctl *GroupController) GetGroupDetail(c *gin.Context) {
+	ctx := c.Request.Context()
+	userID, ok := middleware.GetCurrentUserID(c)
+	if !ok {
+		utils.ResponseUnauthorized(c, "无法获取当前用户信息")
+		return
+	}
+
+	groupID, err := strconv.ParseInt(c.Param("id"), 10, 64)
+	if err != nil {
+		utils.ResponseBadRequest(c, "群 ID 格式错误")
+		return
+	}
+
+	result, err := ctl.groupService.GetGroupDetail(ctx, userID, groupID)
+	if err != nil {
+		ctl.handleError(c, err, "获取群详情失败")
+		return
+	}
+	utils.ResponseOK(c, result)
+}
+
+// UpdateGroup 更新群信息
+// PUT /api/v1/groups/:id
+func (ctl *GroupController) UpdateGroup(c *gin.Context) {
+	ctx := c.Request.Context()
+	userID, ok := middleware.GetCurrentUserID(c)
+	if !ok {
+		utils.ResponseUnauthorized(c, "无法获取当前用户信息")
+		return
+	}
+
+	groupID, err := strconv.ParseInt(c.Param("id"), 10, 64)
+	if err != nil {
+		utils.ResponseBadRequest(c, "群 ID 格式错误")
+		return
+	}
+
+	var req dto.UpdateGroupRequest
+	if err := c.ShouldBindJSON(&req); err != nil {
+		utils.ResponseBadRequest(c, "参数校验失败: "+err.Error())
+		return
+	}
+
+	if err := ctl.groupService.UpdateGroup(ctx, userID, groupID, &req); err != nil {
+		ctl.handleError(c, err, "更新群信息失败")
+		return
+	}
+	utils.ResponseOK(c, nil)
+}
+
+// DissolveGroup 解散群聊
+// DELETE /api/v1/groups/:id
+func (ctl *GroupController) DissolveGroup(c *gin.Context) {
+	ctx := c.Request.Context()
+	userID, ok := middleware.GetCurrentUserID(c)
+	if !ok {
+		utils.ResponseUnauthorized(c, "无法获取当前用户信息")
+		return
+	}
+
+	groupID, err := strconv.ParseInt(c.Param("id"), 10, 64)
+	if err != nil {
+		utils.ResponseBadRequest(c, "群 ID 格式错误")
+		return
+	}
+
+	if err := ctl.groupService.DissolveGroup(ctx, userID, groupID); err != nil {
+		ctl.handleError(c, err, "解散群聊失败")
+		return
+	}
+	utils.ResponseOK(c, nil)
+}
+
+// GetMembers 获取群成员列表
+// GET /api/v1/groups/:id/members
+func (ctl *GroupController) GetMembers(c *gin.Context) {
+	ctx := c.Request.Context()
+	userID, ok := middleware.GetCurrentUserID(c)
+	if !ok {
+		utils.ResponseUnauthorized(c, "无法获取当前用户信息")
+		return
+	}
+
+	groupID, err := strconv.ParseInt(c.Param("id"), 10, 64)
+	if err != nil {
+		utils.ResponseBadRequest(c, "群 ID 格式错误")
+		return
+	}
+
+	result, err := ctl.groupService.GetMembers(ctx, userID, groupID)
+	if err != nil {
+		ctl.handleError(c, err, "获取成员列表失败")
+		return
+	}
+	utils.ResponseOK(c, result)
+}
+
+// InviteMembers 邀请入群
+// POST /api/v1/groups/:id/members
+func (ctl *GroupController) InviteMembers(c *gin.Context) {
+	ctx := c.Request.Context()
+	userID, ok := middleware.GetCurrentUserID(c)
+	if !ok {
+		utils.ResponseUnauthorized(c, "无法获取当前用户信息")
+		return
+	}
+
+	groupID, err := strconv.ParseInt(c.Param("id"), 10, 64)
+	if err != nil {
+		utils.ResponseBadRequest(c, "群 ID 格式错误")
+		return
+	}
+
+	var req dto.InviteMembersRequest
+	if err := c.ShouldBindJSON(&req); err != nil {
+		utils.ResponseBadRequest(c, "参数校验失败: "+err.Error())
+		return
+	}
+
+	if err := ctl.groupService.InviteMembers(ctx, userID, groupID, req.UserIDs); err != nil {
+		ctl.handleError(c, err, "邀请入群失败")
+		return
+	}
+	utils.ResponseOK(c, nil)
+}
+
+// KickMember 踢出成员
+// DELETE /api/v1/groups/:id/members/:uid
+func (ctl *GroupController) KickMember(c *gin.Context) {
+	ctx := c.Request.Context()
+	userID, ok := middleware.GetCurrentUserID(c)
+	if !ok {
+		utils.ResponseUnauthorized(c, "无法获取当前用户信息")
+		return
+	}
+
+	groupID, err := strconv.ParseInt(c.Param("id"), 10, 64)
+	if err != nil {
+		utils.ResponseBadRequest(c, "群 ID 格式错误")
+		return
+	}
+
+	targetID, err := strconv.ParseInt(c.Param("uid"), 10, 64)
+	if err != nil {
+		utils.ResponseBadRequest(c, "用户 ID 格式错误")
+		return
+	}
+
+	if err := ctl.groupService.KickMember(ctx, userID, groupID, targetID); err != nil {
+		ctl.handleError(c, err, "踢出成员失败")
+		return
+	}
+	utils.ResponseOK(c, nil)
+}
+
+// SetMemberRole 设置/取消管理员
+// PUT /api/v1/groups/:id/members/:uid/role
+func (ctl *GroupController) SetMemberRole(c *gin.Context) {
+	ctx := c.Request.Context()
+	userID, ok := middleware.GetCurrentUserID(c)
+	if !ok {
+		utils.ResponseUnauthorized(c, "无法获取当前用户信息")
+		return
+	}
+
+	groupID, err := strconv.ParseInt(c.Param("id"), 10, 64)
+	if err != nil {
+		utils.ResponseBadRequest(c, "群 ID 格式错误")
+		return
+	}
+
+	targetID, err := strconv.ParseInt(c.Param("uid"), 10, 64)
+	if err != nil {
+		utils.ResponseBadRequest(c, "用户 ID 格式错误")
+		return
+	}
+
+	var req dto.SetRoleRequest
+	if err := c.ShouldBindJSON(&req); err != nil {
+		utils.ResponseBadRequest(c, "参数校验失败: "+err.Error())
+		return
+	}
+
+	if err := ctl.groupService.SetMemberRole(ctx, userID, groupID, targetID, req.Role); err != nil {
+		ctl.handleError(c, err, "设置角色失败")
+		return
+	}
+	utils.ResponseOK(c, nil)
+}
+
+// MuteMember 禁言/解除禁言
+// PUT /api/v1/groups/:id/members/:uid/mute
+func (ctl *GroupController) MuteMember(c *gin.Context) {
+	ctx := c.Request.Context()
+	userID, ok := middleware.GetCurrentUserID(c)
+	if !ok {
+		utils.ResponseUnauthorized(c, "无法获取当前用户信息")
+		return
+	}
+
+	groupID, err := strconv.ParseInt(c.Param("id"), 10, 64)
+	if err != nil {
+		utils.ResponseBadRequest(c, "群 ID 格式错误")
+		return
+	}
+
+	targetID, err := strconv.ParseInt(c.Param("uid"), 10, 64)
+	if err != nil {
+		utils.ResponseBadRequest(c, "用户 ID 格式错误")
+		return
+	}
+
+	var req dto.MuteRequest
+	if err := c.ShouldBindJSON(&req); err != nil {
+		utils.ResponseBadRequest(c, "参数校验失败: "+err.Error())
+		return
+	}
+
+	if err := ctl.groupService.MuteMember(ctx, userID, groupID, targetID, req.IsMuted); err != nil {
+		ctl.handleError(c, err, "操作失败")
+		return
+	}
+	utils.ResponseOK(c, nil)
+}
+
+// TransferOwner 转让群主
+// PUT /api/v1/groups/:id/transfer
+func (ctl *GroupController) TransferOwner(c *gin.Context) {
+	ctx := c.Request.Context()
+	userID, ok := middleware.GetCurrentUserID(c)
+	if !ok {
+		utils.ResponseUnauthorized(c, "无法获取当前用户信息")
+		return
+	}
+
+	groupID, err := strconv.ParseInt(c.Param("id"), 10, 64)
+	if err != nil {
+		utils.ResponseBadRequest(c, "群 ID 格式错误")
+		return
+	}
+
+	var req dto.TransferOwnerRequest
+	if err := c.ShouldBindJSON(&req); err != nil {
+		utils.ResponseBadRequest(c, "参数校验失败: "+err.Error())
+		return
+	}
+
+	if err := ctl.groupService.TransferOwner(ctx, userID, groupID, req.NewOwnerID); err != nil {
+		ctl.handleError(c, err, "转让群主失败")
+		return
+	}
+	utils.ResponseOK(c, nil)
+}
+
+// LeaveGroup 退出群聊
+// DELETE /api/v1/groups/:id/members/me
+func (ctl *GroupController) LeaveGroup(c *gin.Context) {
+	ctx := c.Request.Context()
+	userID, ok := middleware.GetCurrentUserID(c)
+	if !ok {
+		utils.ResponseUnauthorized(c, "无法获取当前用户信息")
+		return
+	}
+
+	groupID, err := strconv.ParseInt(c.Param("id"), 10, 64)
+	if err != nil {
+		utils.ResponseBadRequest(c, "群 ID 格式错误")
+		return
+	}
+
+	if err := ctl.groupService.LeaveGroup(ctx, userID, groupID); err != nil {
+		ctl.handleError(c, err, "退出群聊失败")
+		return
+	}
+	utils.ResponseOK(c, nil)
+}
+
+// UpdateNickname 修改群内昵称
+// PUT /api/v1/groups/:id/members/me/nickname
+func (ctl *GroupController) UpdateNickname(c *gin.Context) {
+	ctx := c.Request.Context()
+	userID, ok := middleware.GetCurrentUserID(c)
+	if !ok {
+		utils.ResponseUnauthorized(c, "无法获取当前用户信息")
+		return
+	}
+
+	groupID, err := strconv.ParseInt(c.Param("id"), 10, 64)
+	if err != nil {
+		utils.ResponseBadRequest(c, "群 ID 格式错误")
+		return
+	}
+
+	var req dto.UpdateNicknameRequest
+	if err := c.ShouldBindJSON(&req); err != nil {
+		utils.ResponseBadRequest(c, "参数校验失败: "+err.Error())
+		return
+	}
+
+	if err := ctl.groupService.UpdateNickname(ctx, userID, groupID, req.Nickname); err != nil {
+		ctl.handleError(c, err, "修改昵称失败")
+		return
+	}
+	utils.ResponseOK(c, nil)
+}
+
+// SubmitJoinRequest 申请入群
+// POST /api/v1/groups/:id/join-requests
+func (ctl *GroupController) SubmitJoinRequest(c *gin.Context) {
+	ctx := c.Request.Context()
+	userID, ok := middleware.GetCurrentUserID(c)
+	if !ok {
+		utils.ResponseUnauthorized(c, "无法获取当前用户信息")
+		return
+	}
+
+	groupID, err := strconv.ParseInt(c.Param("id"), 10, 64)
+	if err != nil {
+		utils.ResponseBadRequest(c, "群 ID 格式错误")
+		return
+	}
+
+	var req dto.JoinGroupRequest
+	if err := c.ShouldBindJSON(&req); err != nil {
+		utils.ResponseBadRequest(c, "参数校验失败: "+err.Error())
+		return
+	}
+
+	if err := ctl.groupService.SubmitJoinRequest(ctx, userID, groupID, req.Message); err != nil {
+		ctl.handleError(c, err, "申请入群失败")
+		return
+	}
+	utils.ResponseOK(c, nil)
+}
+
+// GetJoinRequests 获取入群申请列表
+// GET /api/v1/groups/:id/join-requests
+func (ctl *GroupController) GetJoinRequests(c *gin.Context) {
+	ctx := c.Request.Context()
+	userID, ok := middleware.GetCurrentUserID(c)
+	if !ok {
+		utils.ResponseUnauthorized(c, "无法获取当前用户信息")
+		return
+	}
+
+	groupID, err := strconv.ParseInt(c.Param("id"), 10, 64)
+	if err != nil {
+		utils.ResponseBadRequest(c, "群 ID 格式错误")
+		return
+	}
+
+	result, err := ctl.groupService.GetJoinRequests(ctx, userID, groupID)
+	if err != nil {
+		ctl.handleError(c, err, "获取入群申请失败")
+		return
+	}
+	utils.ResponseOK(c, result)
+}
+
+// ReviewJoinRequest 审批入群申请
+// PUT /api/v1/groups/:id/join-requests/:rid
+func (ctl *GroupController) ReviewJoinRequest(c *gin.Context) {
+	ctx := c.Request.Context()
+	userID, ok := middleware.GetCurrentUserID(c)
+	if !ok {
+		utils.ResponseUnauthorized(c, "无法获取当前用户信息")
+		return
+	}
+
+	groupID, err := strconv.ParseInt(c.Param("id"), 10, 64)
+	if err != nil {
+		utils.ResponseBadRequest(c, "群 ID 格式错误")
+		return
+	}
+
+	requestID, err := strconv.ParseInt(c.Param("rid"), 10, 64)
+	if err != nil {
+		utils.ResponseBadRequest(c, "申请 ID 格式错误")
+		return
+	}
+
+	var req dto.ReviewJoinRequest
+	if err := c.ShouldBindJSON(&req); err != nil {
+		utils.ResponseBadRequest(c, "参数校验失败: "+err.Error())
+		return
+	}
+
+	if err := ctl.groupService.ReviewJoinRequest(ctx, userID, groupID, requestID, req.Action); err != nil {
+		ctl.handleError(c, err, "审批失败")
+		return
+	}
+	utils.ResponseOK(c, nil)
+}
+
+// SearchGroups 搜索群聊
+// GET /api/v1/groups/search?keyword=xx&page=1&page_size=20
+func (ctl *GroupController) SearchGroups(c *gin.Context) {
+	ctx := c.Request.Context()
+	_, ok := middleware.GetCurrentUserID(c)
+	if !ok {
+		utils.ResponseUnauthorized(c, "无法获取当前用户信息")
+		return
+	}
+
+	var req dto.SearchGroupRequest
+	if err := c.ShouldBindQuery(&req); err != nil {
+		utils.ResponseBadRequest(c, "参数校验失败: "+err.Error())
+		return
+	}
+
+	result, err := ctl.groupService.SearchGroups(ctx, &req)
+	if err != nil {
+		ctl.handleError(c, err, "搜索群聊失败")
+		return
+	}
+	utils.ResponseOK(c, result)
+}
+
+// SetAllMuted 设置全体禁言
+// PUT /api/v1/groups/:id/all-mute
+func (ctl *GroupController) SetAllMuted(c *gin.Context) {
+	ctx := c.Request.Context()
+	userID, ok := middleware.GetCurrentUserID(c)
+	if !ok {
+		utils.ResponseUnauthorized(c, "无法获取当前用户信息")
+		return
+	}
+
+	groupID, err := strconv.ParseInt(c.Param("id"), 10, 64)
+	if err != nil {
+		utils.ResponseBadRequest(c, "群 ID 格式错误")
+		return
+	}
+
+	var body struct {
+		IsAllMuted bool `json:"is_all_muted"`
+	}
+	if err := c.ShouldBindJSON(&body); err != nil {
+		utils.ResponseBadRequest(c, "参数校验失败: "+err.Error())
+		return
+	}
+
+	if err := ctl.groupService.SetAllMuted(ctx, userID, groupID, body.IsAllMuted); err != nil {
+		ctl.handleError(c, err, "设置全体禁言失败")
+		return
+	}
+	utils.ResponseOK(c, nil)
+}
+
+// handleError 统一业务错误映射
+// 已知业务错误 → 返回 Service 层定义的具体提示
+// 未知错误 → 返回 fallbackMsg（未传则默认"服务器内部错误"）
+func (ctl *GroupController) handleError(c *gin.Context, err error, fallbackMsg ...string) {
+	switch err {
+	case service.ErrGroupNotFound:
+		utils.ResponseNotFound(c, err.Error())
+	case service.ErrGroupDissolved:
+		utils.ResponseBadRequest(c, err.Error())
+	case service.ErrNotGroupMember:
+		utils.ResponseForbidden(c, err.Error())
+	case service.ErrNotGroupOwner:
+		utils.ResponseForbidden(c, err.Error())
+	case service.ErrNotGroupAdmin:
+		utils.ResponseForbidden(c, err.Error())
+	case service.ErrGroupFull:
+		utils.ResponseBadRequest(c, err.Error())
+	case service.ErrAlreadyMember:
+		utils.ResponseBadRequest(c, err.Error())
+	case service.ErrCannotKickHigherRole:
+		utils.ResponseForbidden(c, err.Error())
+	case service.ErrOwnerCannotLeave:
+		utils.ResponseBadRequest(c, err.Error())
+	case service.ErrCannotMuteSelf:
+		utils.ResponseBadRequest(c, err.Error())
+	case service.ErrAlreadyMuted:
+		utils.ResponseBadRequest(c, err.Error())
+	case service.ErrUserMuted:
+		utils.ResponseForbidden(c, err.Error())
+	case service.ErrGroupAllMuted:
+		utils.ResponseForbidden(c, err.Error())
+	case service.ErrPendingRequestExists:
+		utils.ResponseBadRequest(c, err.Error())
+	case service.ErrJoinRequestNotFound:
+		utils.ResponseNotFound(c, err.Error())
+	default:
+		msg := "服务器内部错误"
+		if len(fallbackMsg) > 0 && fallbackMsg[0] != "" {
+			msg = fallbackMsg[0]
+		}
+		utils.ResponseError(c, msg)
+	}
+}
--- a/backend/go-service/app/group/dao/group_dao.go
+++ b/backend/go-service/app/group/dao/group_dao.go
@@ -0,0 +1,346 @@
+// Package dao 提供 group 模块的数据库访问操作
+package dao
+
+import (
+	"context"
+	"time"
+
+	"github.com/echochat/backend/app/constants"
+	"github.com/echochat/backend/app/dto"
+	"github.com/echochat/backend/app/group/model"
+	imModel "github.com/echochat/backend/app/im/model"
+	"github.com/echochat/backend/pkg/logs"
+	"go.uber.org/zap"
+	"gorm.io/gorm"
+)
+
+// GroupDAO 群聊数据访问对象
+type GroupDAO struct {
+	db *gorm.DB
+}
+
+// NewGroupDAO 创建 GroupDAO 实例
+func NewGroupDAO(db *gorm.DB) *GroupDAO {
+	return &GroupDAO{db: db}
+}
+
+// CreateGroupWithMembers 在事务中创建群聊（会话 + 群信息 + 群成员）
+// 创建者自动成为群主（role=2）
+func (d *GroupDAO) CreateGroupWithMembers(ctx context.Context, ownerID int64, name, avatar string, memberIDs []int64) (*model.Group, error) {
+	funcName := "dao.group_dao.CreateGroupWithMembers"
+	logs.Info(ctx, funcName, "创建群聊",
+		zap.Int64("owner_id", ownerID), zap.String("name", name), zap.Int("member_count", len(memberIDs)+1))
+
+	var group model.Group
+	err := d.db.WithContext(ctx).Transaction(func(tx *gorm.DB) error {
+		conv := &imModel.Conversation{
+			Type:      constants.ConversationTypeGroup,
+			CreatorID: ownerID,
+		}
+		if err := tx.Create(conv).Error; err != nil {
+			logs.Error(ctx, funcName, "创建会话失败", zap.Error(err))
+			return err
+		}
+
+		group = model.Group{
+			ConversationID: conv.ID,
+			Name:           name,
+			Avatar:         avatar,
+			OwnerID:        ownerID,
+			MaxMembers:     constants.GroupDefaultMaxMembers,
+			Status:         constants.GroupStatusNormal,
+		}
+		if err := tx.Create(&group).Error; err != nil {
+			logs.Error(ctx, funcName, "创建群信息失败", zap.Error(err))
+			return err
+		}
+
+		now := time.Now()
+		ownerMember := &imModel.ConversationMember{
+			ConversationID: conv.ID,
+			UserID:         ownerID,
+			Role:           constants.GroupRoleOwner,
+			JoinedAt:       &now,
+		}
+		if err := tx.Create(ownerMember).Error; err != nil {
+			logs.Error(ctx, funcName, "创建群主成员记录失败", zap.Error(err))
+			return err
+		}
+
+		for _, uid := range memberIDs {
+			member := &imModel.ConversationMember{
+				ConversationID: conv.ID,
+				UserID:         uid,
+				Role:           constants.GroupRoleNormal,
+				JoinedAt:       &now,
+			}
+			if err := tx.Create(member).Error; err != nil {
+				logs.Error(ctx, funcName, "创建群成员记录失败",
+					zap.Int64("user_id", uid), zap.Error(err))
+				return err
+			}
+		}
+
+		return nil
+	})
+
+	if err != nil {
+		logs.Error(ctx, funcName, "创建群聊失败", zap.Error(err))
+		return nil, err
+	}
+	return &group, nil
+}
+
+// GetByID 根据群 ID 获取群信息
+func (d *GroupDAO) GetByID(ctx context.Context, groupID int64) (*model.Group, error) {
+	funcName := "dao.group_dao.GetByID"
+	logs.Debug(ctx, funcName, "获取群信息", zap.Int64("group_id", groupID))
+
+	var group model.Group
+	err := d.db.WithContext(ctx).First(&group, groupID).Error
+	if err != nil {
+		return nil, err
+	}
+	return &group, nil
+}
+
+// GetByConversationID 根据会话 ID 获取群信息
+func (d *GroupDAO) GetByConversationID(ctx context.Context, conversationID int64) (*model.Group, error) {
+	funcName := "dao.group_dao.GetByConversationID"
+	logs.Debug(ctx, funcName, "按会话 ID 获取群信息", zap.Int64("conversation_id", conversationID))
+
+	var group model.Group
+	err := d.db.WithContext(ctx).Where("conversation_id = ?", conversationID).First(&group).Error
+	if err != nil {
+		return nil, err
+	}
+	return &group, nil
+}
+
+// UpdateGroupInfo 更新群基本信息（名称/头像/公告/可搜索性）
+func (d *GroupDAO) UpdateGroupInfo(ctx context.Context, groupID int64, updates map[string]interface{}) error {
+	funcName := "dao.group_dao.UpdateGroupInfo"
+	logs.Info(ctx, funcName, "更新群信息", zap.Int64("group_id", groupID))
+
+	return d.db.WithContext(ctx).
+		Model(&model.Group{}).
+		Where("id = ?", groupID).
+		Updates(updates).Error
+}
+
+// DissolveGroup 解散群聊（标记状态为已解散）
+func (d *GroupDAO) DissolveGroup(ctx context.Context, groupID int64) error {
+	funcName := "dao.group_dao.DissolveGroup"
+	logs.Info(ctx, funcName, "解散群聊", zap.Int64("group_id", groupID))
+
+	return d.db.WithContext(ctx).
+		Model(&model.Group{}).
+		Where("id = ?", groupID).
+		Update("status", constants.GroupStatusDissolved).Error
+}
+
+// TransferOwner 转让群主
+func (d *GroupDAO) TransferOwner(ctx context.Context, groupID, oldOwnerID, newOwnerID int64, conversationID int64) error {
+	funcName := "dao.group_dao.TransferOwner"
+	logs.Info(ctx, funcName, "转让群主",
+		zap.Int64("group_id", groupID), zap.Int64("old_owner", oldOwnerID), zap.Int64("new_owner", newOwnerID))
+
+	return d.db.WithContext(ctx).Transaction(func(tx *gorm.DB) error {
+		if err := tx.Model(&model.Group{}).
+			Where("id = ?", groupID).
+			Update("owner_id", newOwnerID).Error; err != nil {
+			return err
+		}
+
+		if err := tx.Model(&imModel.ConversationMember{}).
+			Where("conversation_id = ? AND user_id = ?", conversationID, oldOwnerID).
+			Update("role", constants.GroupRoleNormal).Error; err != nil {
+			return err
+		}
+
+		if err := tx.Model(&imModel.ConversationMember{}).
+			Where("conversation_id = ? AND user_id = ?", conversationID, newOwnerID).
+			Update("role", constants.GroupRoleOwner).Error; err != nil {
+			return err
+		}
+
+		return nil
+	})
+}
+
+// SetAllMuted 设置/取消全体禁言
+func (d *GroupDAO) SetAllMuted(ctx context.Context, groupID int64, isMuted bool) error {
+	funcName := "dao.group_dao.SetAllMuted"
+	logs.Info(ctx, funcName, "设置全体禁言", zap.Int64("group_id", groupID), zap.Bool("is_muted", isMuted))
+
+	return d.db.WithContext(ctx).
+		Model(&model.Group{}).
+		Where("id = ?", groupID).
+		Update("is_all_muted", isMuted).Error
+}
+
+// GetGroupBrief 获取群简要信息（满足 im/service.GroupInfoGetter 接口）
+func (d *GroupDAO) GetGroupBrief(ctx context.Context, conversationID int64) (*dto.GroupBrief, error) {
+	funcName := "dao.group_dao.GetGroupBrief"
+	logs.Debug(ctx, funcName, "获取群简要信息", zap.Int64("conversation_id", conversationID))
+
+	var group model.Group
+	err := d.db.WithContext(ctx).Where("conversation_id = ?", conversationID).First(&group).Error
+	if err != nil {
+		return nil, err
+	}
+	return &dto.GroupBrief{
+		ID:         group.ID,
+		Name:       group.Name,
+		Avatar:     group.Avatar,
+		IsAllMuted: group.IsAllMuted,
+		Status:     group.Status,
+	}, nil
+}
+
+// GetMemberCount 获取群成员数量
+func (d *GroupDAO) GetMemberCount(ctx context.Context, conversationID int64) (int64, error) {
+	var count int64
+	err := d.db.WithContext(ctx).
+		Model(&imModel.ConversationMember{}).
+		Where("conversation_id = ?", conversationID).
+		Count(&count).Error
+	return count, err
+}
+
+// GetMember 获取指定群成员记录
+func (d *GroupDAO) GetMember(ctx context.Context, conversationID, userID int64) (*imModel.ConversationMember, error) {
+	funcName := "dao.group_dao.GetMember"
+	logs.Debug(ctx, funcName, "查询群成员",
+		zap.Int64("conversation_id", conversationID), zap.Int64("user_id", userID))
+
+	var member imModel.ConversationMember
+	err := d.db.WithContext(ctx).
+		Where("conversation_id = ? AND user_id = ?", conversationID, userID).
+		First(&member).Error
+	if err != nil {
+		return nil, err
+	}
+	return &member, nil
+}
+
+// GetMembers 获取群所有成员列表
+func (d *GroupDAO) GetMembers(ctx context.Context, conversationID int64) ([]imModel.ConversationMember, error) {
+	funcName := "dao.group_dao.GetMembers"
+	logs.Debug(ctx, funcName, "获取群成员列表", zap.Int64("conversation_id", conversationID))
+
+	var members []imModel.ConversationMember
+	err := d.db.WithContext(ctx).
+		Where("conversation_id = ?", conversationID).
+		Order("role DESC, joined_at ASC").
+		Find(&members).Error
+	return members, err
+}
+
+// GetMemberIDs 获取群所有成员 ID
+func (d *GroupDAO) GetMemberIDs(ctx context.Context, conversationID int64) ([]int64, error) {
+	var ids []int64
+	err := d.db.WithContext(ctx).
+		Model(&imModel.ConversationMember{}).
+		Where("conversation_id = ?", conversationID).
+		Pluck("user_id", &ids).Error
+	return ids, err
+}
+
+// GetAdminIDs 获取群主和管理员 ID 列表（用于推送入群申请通知）
+func (d *GroupDAO) GetAdminIDs(ctx context.Context, conversationID int64) ([]int64, error) {
+	var ids []int64
+	err := d.db.WithContext(ctx).
+		Model(&imModel.ConversationMember{}).
+		Where("conversation_id = ? AND role >= ?", conversationID, constants.GroupRoleAdmin).
+		Pluck("user_id", &ids).Error
+	return ids, err
+}
+
+// AddMember 添加群成员
+func (d *GroupDAO) AddMember(ctx context.Context, conversationID, userID int64, role int) error {
+	funcName := "dao.group_dao.AddMember"
+	logs.Info(ctx, funcName, "添加群成员",
+		zap.Int64("conversation_id", conversationID), zap.Int64("user_id", userID))
+
+	now := time.Now()
+	member := &imModel.ConversationMember{
+		ConversationID: conversationID,
+		UserID:         userID,
+		Role:           role,
+		JoinedAt:       &now,
+	}
+	return d.db.WithContext(ctx).Create(member).Error
+}
+
+// RemoveMember 移除群成员
+func (d *GroupDAO) RemoveMember(ctx context.Context, conversationID, userID int64) error {
+	funcName := "dao.group_dao.RemoveMember"
+	logs.Info(ctx, funcName, "移除群成员",
+		zap.Int64("conversation_id", conversationID), zap.Int64("user_id", userID))
+
+	return d.db.WithContext(ctx).
+		Where("conversation_id = ? AND user_id = ?", conversationID, userID).
+		Delete(&imModel.ConversationMember{}).Error
+}
+
+// UpdateMemberRole 更新成员角色
+func (d *GroupDAO) UpdateMemberRole(ctx context.Context, conversationID, userID int64, role int) error {
+	funcName := "dao.group_dao.UpdateMemberRole"
+	logs.Info(ctx, funcName, "更新成员角色",
+		zap.Int64("conversation_id", conversationID), zap.Int64("user_id", userID), zap.Int("role", role))
+
+	return d.db.WithContext(ctx).
+		Model(&imModel.ConversationMember{}).
+		Where("conversation_id = ? AND user_id = ?", conversationID, userID).
+		Update("role", role).Error
+}
+
+// UpdateMemberMuted 更新成员禁言状态
+func (d *GroupDAO) UpdateMemberMuted(ctx context.Context, conversationID, userID int64, isMuted bool) error {
+	funcName := "dao.group_dao.UpdateMemberMuted"
+	logs.Info(ctx, funcName, "更新成员禁言状态",
+		zap.Int64("conversation_id", conversationID), zap.Int64("user_id", userID), zap.Bool("is_muted", isMuted))
+
+	return d.db.WithContext(ctx).
+		Model(&imModel.ConversationMember{}).
+		Where("conversation_id = ? AND user_id = ?", conversationID, userID).
+		Update("is_muted", isMuted).Error
+}
+
+// UpdateMemberNickname 更新成员群内昵称
+func (d *GroupDAO) UpdateMemberNickname(ctx context.Context, conversationID, userID int64, nickname string) error {
+	funcName := "dao.group_dao.UpdateMemberNickname"
+	logs.Info(ctx, funcName, "更新群昵称",
+		zap.Int64("conversation_id", conversationID), zap.Int64("user_id", userID))
+
+	return d.db.WithContext(ctx).
+		Model(&imModel.ConversationMember{}).
+		Where("conversation_id = ? AND user_id = ?", conversationID, userID).
+		Update("nickname", nickname).Error
+}
+
+// SearchGroups 搜索可发现的群聊（按群名称全文搜索）
+func (d *GroupDAO) SearchGroups(ctx context.Context, keyword string, offset, limit int) ([]model.Group, int64, error) {
+	funcName := "dao.group_dao.SearchGroups"
+	logs.Debug(ctx, funcName, "搜索群聊", zap.String("keyword", keyword))
+
+	var total int64
+	query := d.db.WithContext(ctx).
+		Model(&model.Group{}).
+		Where("status = ? AND is_searchable = true AND to_tsvector('simple', name) @@ plainto_tsquery('simple', ?)",
+			constants.GroupStatusNormal, keyword)
+
+	if err := query.Count(&total).Error; err != nil {
+		logs.Error(ctx, funcName, "搜索计数失败", zap.Error(err))
+		return nil, 0, err
+	}
+
+	var groups []model.Group
+	err := query.Offset(offset).Limit(limit).Order("created_at DESC").Find(&groups).Error
+	if err != nil {
+		logs.Error(ctx, funcName, "搜索查询失败", zap.Error(err))
+		return nil, 0, err
+	}
+	return groups, total, nil
+}
--- a/backend/go-service/app/group/dao/join_request_dao.go
+++ b/backend/go-service/app/group/dao/join_request_dao.go
@@ -0,0 +1,112 @@
+package dao
+
+import (
+	"context"
+
+	"github.com/echochat/backend/app/constants"
+	"github.com/echochat/backend/app/group/model"
+	"github.com/echochat/backend/pkg/logs"
+	"go.uber.org/zap"
+	"gorm.io/gorm"
+)
+
+// JoinRequestDAO 入群申请数据访问对象
+type JoinRequestDAO struct {
+	db *gorm.DB
+}
+
+// NewJoinRequestDAO 创建 JoinRequestDAO 实例
+func NewJoinRequestDAO(db *gorm.DB) *JoinRequestDAO {
+	return &JoinRequestDAO{db: db}
+}
+
+// Create 创建入群申请
+func (d *JoinRequestDAO) Create(ctx context.Context, groupID, userID int64, message string) (*model.GroupJoinRequest, error) {
+	funcName := "dao.join_request_dao.Create"
+	logs.Info(ctx, funcName, "创建入群申请",
+		zap.Int64("group_id", groupID), zap.Int64("user_id", userID))
+
+	req := &model.GroupJoinRequest{
+		GroupID: groupID,
+		UserID:  userID,
+		Message: message,
+		Status:  constants.JoinRequestStatusPending,
+	}
+	err := d.db.WithContext(ctx).Create(req).Error
+	if err != nil {
+		logs.Error(ctx, funcName, "创建入群申请失败", zap.Error(err))
+	}
+	return req, err
+}
+
+// GetByID 根据 ID 获取入群申请
+func (d *JoinRequestDAO) GetByID(ctx context.Context, id int64) (*model.GroupJoinRequest, error) {
+	var req model.GroupJoinRequest
+	err := d.db.WithContext(ctx).First(&req, id).Error
+	if err != nil {
+		return nil, err
+	}
+	return &req, nil
+}
+
+// GetPendingByGroupAndUser 查找用户对某群的待处理申请
+func (d *JoinRequestDAO) GetPendingByGroupAndUser(ctx context.Context, groupID, userID int64) (*model.GroupJoinRequest, error) {
+	funcName := "dao.join_request_dao.GetPendingByGroupAndUser"
+	logs.Debug(ctx, funcName, "查找待处理申请",
+		zap.Int64("group_id", groupID), zap.Int64("user_id", userID))
+
+	var req model.GroupJoinRequest
+	err := d.db.WithContext(ctx).
+		Where("group_id = ? AND user_id = ? AND status = ?", groupID, userID, constants.JoinRequestStatusPending).
+		First(&req).Error
+	if err == gorm.ErrRecordNotFound {
+		return nil, nil
+	}
+	if err != nil {
+		return nil, err
+	}
+	return &req, nil
+}
+
+// GetListByGroup 获取群的入群申请列表
+func (d *JoinRequestDAO) GetListByGroup(ctx context.Context, groupID int64) ([]model.GroupJoinRequest, error) {
+	funcName := "dao.join_request_dao.GetListByGroup"
+	logs.Debug(ctx, funcName, "获取入群申请列表", zap.Int64("group_id", groupID))
+
+	var requests []model.GroupJoinRequest
+	err := d.db.WithContext(ctx).
+		Where("group_id = ?", groupID).
+		Order("created_at DESC").
+		Find(&requests).Error
+	return requests, err
+}
+
+// Approve 通过入群申请
+func (d *JoinRequestDAO) Approve(ctx context.Context, id, reviewerID int64) error {
+	funcName := "dao.join_request_dao.Approve"
+	logs.Info(ctx, funcName, "通过入群申请",
+		zap.Int64("request_id", id), zap.Int64("reviewer_id", reviewerID))
+
+	return d.db.WithContext(ctx).
+		Model(&model.GroupJoinRequest{}).
+		Where("id = ?", id).
+		Updates(map[string]interface{}{
+			"status":      constants.JoinRequestStatusApproved,
+			"reviewer_id": reviewerID,
+		}).Error
+}
+
+// Reject 拒绝入群申请
+func (d *JoinRequestDAO) Reject(ctx context.Context, id, reviewerID int64) error {
+	funcName := "dao.join_request_dao.Reject"
+	logs.Info(ctx, funcName, "拒绝入群申请",
+		zap.Int64("request_id", id), zap.Int64("reviewer_id", reviewerID))
+
+	return d.db.WithContext(ctx).
+		Model(&model.GroupJoinRequest{}).
+		Where("id = ?", id).
+		Updates(map[string]interface{}{
+			"status":      constants.JoinRequestStatusRejected,
+			"reviewer_id": reviewerID,
+		}).Error
+}
--- a/backend/go-service/app/group/dao/message_read_dao.go
+++ b/backend/go-service/app/group/dao/message_read_dao.go
@@ -0,0 +1,129 @@
+package dao
+
+import (
+	"context"
+
+	"github.com/echochat/backend/app/group/model"
+	"github.com/echochat/backend/pkg/logs"
+	"go.uber.org/zap"
+	"gorm.io/gorm"
+	"gorm.io/gorm/clause"
+)
+
+// MessageReadDAO 消息已读记录数据访问对象
+type MessageReadDAO struct {
+	db *gorm.DB
+}
+
+// NewMessageReadDAO 创建 MessageReadDAO 实例
+func NewMessageReadDAO(db *gorm.DB) *MessageReadDAO {
+	return &MessageReadDAO{db: db}
+}
+
+// BatchCreate 批量创建已读记录（忽略重复冲突）
+func (d *MessageReadDAO) BatchCreate(ctx context.Context, reads []model.MessageRead) error {
+	funcName := "dao.message_read_dao.BatchCreate"
+	logs.Info(ctx, funcName, "批量创建已读记录", zap.Int("count", len(reads)))
+
+	if len(reads) == 0 {
+		return nil
+	}
+	return d.db.WithContext(ctx).
+		Clauses(clause.OnConflict{DoNothing: true}).
+		Create(&reads).Error
+}
+
+// GetReadCount 获取消息的已读人数
+func (d *MessageReadDAO) GetReadCount(ctx context.Context, messageID int64) (int64, error) {
+	var count int64
+	err := d.db.WithContext(ctx).
+		Model(&model.MessageRead{}).
+		Where("message_id = ?", messageID).
+		Count(&count).Error
+	return count, err
+}
+
+// GetReadCountBatch 批量获取多条消息的已读人数
+func (d *MessageReadDAO) GetReadCountBatch(ctx context.Context, messageIDs []int64) (map[int64]int, error) {
+	funcName := "dao.message_read_dao.GetReadCountBatch"
+	logs.Debug(ctx, funcName, "批量获取已读计数", zap.Int("count", len(messageIDs)))
+
+	type result struct {
+		MessageID int64 `gorm:"column:message_id"`
+		ReadCount int   `gorm:"column:read_count"`
+	}
+
+	var results []result
+	err := d.db.WithContext(ctx).
+		Model(&model.MessageRead{}).
+		Select("message_id, COUNT(*) as read_count").
+		Where("message_id IN ?", messageIDs).
+		Group("message_id").
+		Scan(&results).Error
+
+	if err != nil {
+		return nil, err
+	}
+
+	m := make(map[int64]int, len(results))
+	for _, r := range results {
+		m[r.MessageID] = r.ReadCount
+	}
+	return m, nil
+}
+
+// GetReadUsers 获取消息的已读用户列表
+func (d *MessageReadDAO) GetReadUsers(ctx context.Context, messageID int64) ([]model.MessageRead, error) {
+	funcName := "dao.message_read_dao.GetReadUsers"
+	logs.Debug(ctx, funcName, "获取已读用户列表", zap.Int64("message_id", messageID))
+
+	var reads []model.MessageRead
+	err := d.db.WithContext(ctx).
+		Where("message_id = ?", messageID).
+		Order("read_at ASC").
+		Find(&reads).Error
+	return reads, err
+}
+
+// BatchCreateReads 批量标记消息已读（满足 im/service.MessageReadRecorder 接口）
+func (d *MessageReadDAO) BatchCreateReads(ctx context.Context, messageIDs []int64, userID int64) error {
+	funcName := "dao.message_read_dao.BatchCreateReads"
+	logs.Info(ctx, funcName, "批量标记已读",
+		zap.Int64("user_id", userID), zap.Int("count", len(messageIDs)))
+
+	if len(messageIDs) == 0 {
+		return nil
+	}
+
+	reads := make([]model.MessageRead, 0, len(messageIDs))
+	for _, msgID := range messageIDs {
+		reads = append(reads, model.MessageRead{
+			MessageID: msgID,
+			UserID:    userID,
+		})
+	}
+	return d.BatchCreate(ctx, reads)
+}
+
+// GetReadUserIDs 获取消息的已读用户 ID 列表（满足 im/service.MessageReadRecorder 接口）
+func (d *MessageReadDAO) GetReadUserIDs(ctx context.Context, messageID int64) ([]int64, error) {
+	funcName := "dao.message_read_dao.GetReadUserIDs"
+	logs.Debug(ctx, funcName, "获取已读用户 ID 列表", zap.Int64("message_id", messageID))
+
+	var ids []int64
+	err := d.db.WithContext(ctx).
+		Model(&model.MessageRead{}).
+		Where("message_id = ?", messageID).
+		Pluck("user_id", &ids).Error
+	return ids, err
+}
+
+// HasRead 检查用户是否已读某消息
+func (d *MessageReadDAO) HasRead(ctx context.Context, messageID, userID int64) (bool, error) {
+	var count int64
+	err := d.db.WithContext(ctx).
+		Model(&model.MessageRead{}).
+		Where("message_id = ? AND user_id = ?", messageID, userID).
+		Count(&count).Error
+	return count > 0, err
+}
--- a/backend/go-service/app/group/model/group.go
+++ b/backend/go-service/app/group/model/group.go
@@ -0,0 +1,27 @@
+// Package model 定义 group 模块的数据库模型
+package model
+
+import "time"
+
+// Group 群聊信息模型，对应 im_groups 表
+// 与 im_conversations (type=2) 一对一关联
+// Status: 1=正常，2=已解散
+type Group struct {
+	ID             int64     `json:"id" gorm:"primaryKey;autoIncrement"`                          // 群唯一标识
+	ConversationID int64     `json:"conversation_id" gorm:"not null;uniqueIndex"`                 // 关联 im_conversations.id
+	Name           string    `json:"name" gorm:"size:100;not null;default:''"`                    // 群名称
+	Avatar         string    `json:"avatar" gorm:"size:500;default:''"`                           // 群头像 URL（MinIO）
+	OwnerID        int64     `json:"owner_id" gorm:"not null;index:idx_im_groups_owner"`          // 群主用户 ID
+	Notice         string    `json:"notice" gorm:"type:text;default:''"`                          // 群公告内容
+	MaxMembers     int       `json:"max_members" gorm:"not null;default:200"`                     // 最大成员数
+	IsSearchable   bool      `json:"is_searchable" gorm:"not null;default:true"`                  // 是否可被搜索发现
+	IsAllMuted     bool      `json:"is_all_muted" gorm:"not null;default:false"`                  // 是否全体禁言
+	Status         int       `json:"status" gorm:"not null;default:1"`                            // 群状态：1=正常，2=已解散
+	CreatedAt      time.Time `json:"created_at" gorm:"not null;autoCreateTime;type:timestamp(0)"` // 创建时间
+	UpdatedAt      time.Time `json:"updated_at" gorm:"not null;autoUpdateTime;type:timestamp(0)"` // 更新时间
+}
+
+// TableName 指定数据库表名
+func (Group) TableName() string {
+	return "im_groups"
+}
--- a/backend/go-service/app/group/model/join_request.go
+++ b/backend/go-service/app/group/model/join_request.go
@@ -0,0 +1,21 @@
+package model
+
+import "time"
+
+// GroupJoinRequest 入群申请模型，对应 im_group_join_requests 表
+// Status: 0=待审批，1=通过，2=拒绝
+type GroupJoinRequest struct {
+	ID         int64     `json:"id" gorm:"primaryKey;autoIncrement"`                          // 申请唯一标识
+	GroupID    int64     `json:"group_id" gorm:"not null;index:idx_group_join_req_group"`     // 目标群 ID
+	UserID     int64     `json:"user_id" gorm:"not null;index:idx_group_join_req_user"`       // 申请人用户 ID
+	Message    string    `json:"message" gorm:"type:text;default:''"`                         // 申请附言
+	ReviewerID *int64    `json:"reviewer_id"`                                                 // 审批人用户 ID
+	Status     int       `json:"status" gorm:"not null;default:0"`                            // 状态：0=待审批，1=通过，2=拒绝
+	CreatedAt  time.Time `json:"created_at" gorm:"not null;autoCreateTime;type:timestamp(0)"` // 申请时间
+	UpdatedAt  time.Time `json:"updated_at" gorm:"not null;autoUpdateTime;type:timestamp(0)"` // 更新时间
+}
+
+// TableName 指定数据库表名
+func (GroupJoinRequest) TableName() string {
+	return "im_group_join_requests"
+}
--- a/backend/go-service/app/group/model/message_read.go
+++ b/backend/go-service/app/group/model/message_read.go
@@ -0,0 +1,16 @@
+package model
+
+import "time"
+
+// MessageRead 群聊消息已读记录模型，对应 im_message_reads 表
+// 复合主键 (message_id, user_id)，记录每条群消息的已读用户
+type MessageRead struct {
+	MessageID int64     `json:"message_id" gorm:"primaryKey"`                                // 消息 ID
+	UserID    int64     `json:"user_id" gorm:"primaryKey"`                                   // 已读用户 ID
+	ReadAt    time.Time `json:"read_at" gorm:"not null;autoCreateTime;type:timestamp(0)"`    // 已读时间
+}
+
+// TableName 指定数据库表名
+func (MessageRead) TableName() string {
+	return "im_message_reads"
+}
--- a/backend/go-service/app/group/provider.go
+++ b/backend/go-service/app/group/provider.go
@@ -0,0 +1,18 @@
+// Package group 群聊管理模块
+package group
+
+import (
+	"github.com/echochat/backend/app/group/controller"
+	"github.com/echochat/backend/app/group/dao"
+	"github.com/echochat/backend/app/group/service"
+	"github.com/google/wire"
+)
+
+// GroupSet 群聊模块 Wire Provider Set
+var GroupSet = wire.NewSet(
+	dao.NewGroupDAO,
+	dao.NewJoinRequestDAO,
+	dao.NewMessageReadDAO,
+	service.NewGroupService,
+	controller.NewGroupController,
+)
--- a/backend/go-service/app/group/router.go
+++ b/backend/go-service/app/group/router.go
@@ -0,0 +1,38 @@
+package group
+
+import (
+	"github.com/echochat/backend/app/group/controller"
+	"github.com/gin-gonic/gin"
+)
+
+// RegisterRoutes 注册 group 模块的所有路由（需要 JWT 中间件）
+func RegisterRoutes(r *gin.Engine, ctrl *controller.GroupController, jwtAuth gin.HandlerFunc) {
+	authed := r.Group("/api/v1")
+	authed.Use(jwtAuth)
+	{
+		// 群聊管理
+		authed.POST("/groups", ctrl.CreateGroup)
+		authed.GET("/groups/search", ctrl.SearchGroups)
+		authed.GET("/groups/:id", ctrl.GetGroupDetail)
+		authed.PUT("/groups/:id", ctrl.UpdateGroup)
+		authed.DELETE("/groups/:id", ctrl.DissolveGroup)
+
+		// 群成员管理
+		authed.GET("/groups/:id/members", ctrl.GetMembers)
+		authed.POST("/groups/:id/members", ctrl.InviteMembers)
+		authed.DELETE("/groups/:id/members/me", ctrl.LeaveGroup)
+		authed.DELETE("/groups/:id/members/:uid", ctrl.KickMember)
+		authed.PUT("/groups/:id/members/me/nickname", ctrl.UpdateNickname)
+		authed.PUT("/groups/:id/members/:uid/role", ctrl.SetMemberRole)
+		authed.PUT("/groups/:id/members/:uid/mute", ctrl.MuteMember)
+
+		// 群主转让 + 全体禁言
+		authed.PUT("/groups/:id/transfer", ctrl.TransferOwner)
+		authed.PUT("/groups/:id/all-mute", ctrl.SetAllMuted)
+
+		// 入群申请
+		authed.POST("/groups/:id/join-requests", ctrl.SubmitJoinRequest)
+		authed.GET("/groups/:id/join-requests", ctrl.GetJoinRequests)
+		authed.PUT("/groups/:id/join-requests/:rid", ctrl.ReviewJoinRequest)
+	}
+}
--- a/backend/go-service/app/group/service/group_service.go
+++ b/backend/go-service/app/group/service/group_service.go
@@ -0,0 +1,940 @@
+// Package service 提供 group 模块的业务逻辑
+package service
+
+import (
+	"context"
+	"errors"
+	"fmt"
+
+	authModel "github.com/echochat/backend/app/auth/model"
+	"github.com/echochat/backend/app/constants"
+	"github.com/echochat/backend/app/dto"
+	"github.com/echochat/backend/app/group/dao"
+	"github.com/echochat/backend/app/group/model"
+	imModel "github.com/echochat/backend/app/im/model"
+	"github.com/echochat/backend/pkg/logs"
+	"github.com/echochat/backend/pkg/ws"
+	"go.uber.org/zap"
+	"gorm.io/gorm"
+)
+
+var (
+	ErrGroupNotFound        = errors.New("群聊不存在")
+	ErrGroupDissolved       = errors.New("群聊已解散")
+	ErrNotGroupMember       = errors.New("你不是该群成员")
+	ErrNotGroupOwner        = errors.New("仅群主可执行此操作")
+	ErrNotGroupAdmin        = errors.New("仅群主或管理员可执行此操作")
+	ErrGroupFull            = errors.New("群成员已满")
+	ErrAlreadyMember        = errors.New("该用户已是群成员")
+	ErrCannotKickHigherRole = errors.New("不能操作同级或更高权限的成员")
+	ErrOwnerCannotLeave     = errors.New("群主不能退出群聊，请先转让群主")
+	ErrCannotMuteSelf       = errors.New("不能禁言自己")
+	ErrAlreadyMuted         = errors.New("该成员已被禁言")
+	ErrUserMuted            = errors.New("你已被禁言，无法发送消息")
+	ErrGroupAllMuted        = errors.New("当前群已开启全体禁言")
+	ErrPendingRequestExists = errors.New("已有待处理的入群申请")
+	ErrJoinRequestNotFound  = errors.New("入群申请不存在")
+)
+
+// UserInfoProvider 获取用户信息的接口（通过接口注入，由 contact.FriendshipDAO 隐式实现）
+type UserInfoProvider interface {
+	GetUsersByIDs(ctx context.Context, userIDs []int64) ([]authModel.User, error)
+}
+
+// MessageWriter 写入系统消息的接口（由 im.MessageDAO 隐式实现）
+type MessageWriter interface {
+	Create(ctx context.Context, msg *imModel.Message) error
+}
+
+// GroupService 群聊业务服务
+type GroupService struct {
+	groupDAO       *dao.GroupDAO
+	joinRequestDAO *dao.JoinRequestDAO
+	userInfo       UserInfoProvider
+	pubsub         *ws.PubSub
+	msgWriter      MessageWriter
+}
+
+// NewGroupService 创建 GroupService 实例
+func NewGroupService(
+	groupDAO *dao.GroupDAO,
+	joinRequestDAO *dao.JoinRequestDAO,
+	userInfo UserInfoProvider,
+	pubsub *ws.PubSub,
+	msgWriter MessageWriter,
+) *GroupService {
+	return &GroupService{
+		groupDAO:       groupDAO,
+		joinRequestDAO: joinRequestDAO,
+		userInfo:       userInfo,
+		pubsub:         pubsub,
+		msgWriter:      msgWriter,
+	}
+}
+
+// CreateGroup 创建群聊
+func (s *GroupService) CreateGroup(ctx context.Context, ownerID int64, req *dto.CreateGroupRequest) (*dto.GroupDTO, error) {
+	funcName := "service.group_service.CreateGroup"
+	logs.Info(ctx, funcName, "创建群聊",
+		zap.Int64("owner_id", ownerID), zap.String("name", req.Name), zap.Int("member_count", len(req.MemberIDs)))
+
+	group, err := s.groupDAO.CreateGroupWithMembers(ctx, ownerID, req.Name, req.Avatar, req.MemberIDs)
+	if err != nil {
+		logs.Error(ctx, funcName, "创建群聊失败", zap.Error(err))
+		return nil, err
+	}
+
+	s.writeSystemMessage(ctx, group.ConversationID, fmt.Sprintf("%s 创建了群聊", s.getUserNickname(ctx, ownerID)))
+
+	allMemberIDs := append([]int64{ownerID}, req.MemberIDs...)
+	s.pushToMembers(ctx, allMemberIDs, 0, "group.created", map[string]interface{}{
+		"group_id":        group.ID,
+		"conversation_id": group.ConversationID,
+		"name":            group.Name,
+		"owner_id":        ownerID,
+	})
+
+	return s.toGroupDTO(group, int(len(req.MemberIDs)+1)), nil
+}
+
+// GetGroupDetail 获取群详情（需要是群成员）
+func (s *GroupService) GetGroupDetail(ctx context.Context, userID, groupID int64) (*dto.GroupDTO, error) {
+	funcName := "service.group_service.GetGroupDetail"
+	logs.Debug(ctx, funcName, "获取群详情",
+		zap.Int64("user_id", userID), zap.Int64("group_id", groupID))
+
+	group, err := s.groupDAO.GetByID(ctx, groupID)
+	if err != nil {
+		if errors.Is(err, gorm.ErrRecordNotFound) {
+			return nil, ErrGroupNotFound
+		}
+		return nil, err
+	}
+
+	_, err = s.groupDAO.GetMember(ctx, group.ConversationID, userID)
+	if err != nil {
+		if errors.Is(err, gorm.ErrRecordNotFound) {
+			return nil, ErrNotGroupMember
+		}
+		return nil, err
+	}
+
+	count, _ := s.groupDAO.GetMemberCount(ctx, group.ConversationID)
+	return s.toGroupDTO(group, int(count)), nil
+}
+
+// UpdateGroup 更新群信息（群主或管理员）
+func (s *GroupService) UpdateGroup(ctx context.Context, userID, groupID int64, req *dto.UpdateGroupRequest) error {
+	funcName := "service.group_service.UpdateGroup"
+	logs.Info(ctx, funcName, "更新群信息",
+		zap.Int64("user_id", userID), zap.Int64("group_id", groupID))
+
+	group, _, err := s.checkGroupAdmin(ctx, groupID, userID)
+	if err != nil {
+		return err
+	}
+
+	updates := make(map[string]interface{})
+	if req.Name != nil {
+		updates["name"] = *req.Name
+	}
+	if req.Avatar != nil {
+		updates["avatar"] = *req.Avatar
+	}
+	if req.Notice != nil {
+		updates["notice"] = *req.Notice
+	}
+	if req.IsSearchable != nil {
+		updates["is_searchable"] = *req.IsSearchable
+	}
+
+	if len(updates) == 0 {
+		return nil
+	}
+
+	if err := s.groupDAO.UpdateGroupInfo(ctx, groupID, updates); err != nil {
+		return err
+	}
+
+	if req.Notice != nil {
+		s.writeSystemMessage(ctx, group.ConversationID,
+			fmt.Sprintf("%s 更新了群公告", s.getUserNickname(ctx, userID)))
+	}
+
+	s.pushToGroupMembers(ctx, group.ConversationID, 0, "group.info.update", map[string]interface{}{
+		"group_id":        groupID,
+		"conversation_id": group.ConversationID,
+		"operator_id":     userID,
+		"updates":         updates,
+	})
+
+	return nil
+}
+
+// DissolveGroup 解散群聊（仅群主）
+func (s *GroupService) DissolveGroup(ctx context.Context, userID, groupID int64) error {
+	funcName := "service.group_service.DissolveGroup"
+	logs.Info(ctx, funcName, "解散群聊",
+		zap.Int64("user_id", userID), zap.Int64("group_id", groupID))
+
+	group, err := s.getActiveGroup(ctx, groupID)
+	if err != nil {
+		return err
+	}
+	if group.OwnerID != userID {
+		return ErrNotGroupOwner
+	}
+
+	memberIDs, _ := s.groupDAO.GetMemberIDs(ctx, group.ConversationID)
+
+	if err := s.groupDAO.DissolveGroup(ctx, groupID); err != nil {
+		return err
+	}
+
+	s.writeSystemMessage(ctx, group.ConversationID, "群聊已解散")
+
+	s.pushToMembers(ctx, memberIDs, 0, "group.dissolved", map[string]interface{}{
+		"group_id":        groupID,
+		"conversation_id": group.ConversationID,
+		"operator_id":     userID,
+	})
+
+	return nil
+}
+
+// GetMembers 获取群成员列表（需要是群成员）
+func (s *GroupService) GetMembers(ctx context.Context, userID, groupID int64) ([]dto.GroupMemberDTO, error) {
+	funcName := "service.group_service.GetMembers"
+	logs.Debug(ctx, funcName, "获取群成员列表",
+		zap.Int64("user_id", userID), zap.Int64("group_id", groupID))
+
+	group, err := s.getActiveGroup(ctx, groupID)
+	if err != nil {
+		return nil, err
+	}
+
+	_, err = s.groupDAO.GetMember(ctx, group.ConversationID, userID)
+	if err != nil {
+		if errors.Is(err, gorm.ErrRecordNotFound) {
+			return nil, ErrNotGroupMember
+		}
+		return nil, err
+	}
+
+	members, err := s.groupDAO.GetMembers(ctx, group.ConversationID)
+	if err != nil {
+		return nil, err
+	}
+
+	userIDs := make([]int64, 0, len(members))
+	for _, m := range members {
+		userIDs = append(userIDs, m.UserID)
+	}
+
+	userMap := make(map[int64]*authModel.User)
+	if len(userIDs) > 0 && s.userInfo != nil {
+		users, uErr := s.userInfo.GetUsersByIDs(ctx, userIDs)
+		if uErr != nil {
+			logs.Error(ctx, funcName, "批量查询用户信息失败", zap.Error(uErr))
+		} else {
+			for i := range users {
+				userMap[users[i].ID] = &users[i]
+			}
+		}
+	}
+
+	list := make([]dto.GroupMemberDTO, 0, len(members))
+	for _, m := range members {
+		item := dto.GroupMemberDTO{
+			UserID:   m.UserID,
+			Nickname: m.Nickname,
+			Role:     m.Role,
+			IsMuted:  m.IsMuted,
+		}
+		if m.JoinedAt != nil {
+			item.JoinedAt = m.JoinedAt.Format("2006-01-02 15:04:05")
+		}
+		if user, ok := userMap[m.UserID]; ok {
+			item.UserNickname = user.Nickname
+			item.Avatar = user.Avatar
+		}
+		list = append(list, item)
+	}
+
+	return list, nil
+}
+
+// InviteMembers 邀请用户入群（群主/管理员）
+func (s *GroupService) InviteMembers(ctx context.Context, userID, groupID int64, targetIDs []int64) error {
+	funcName := "service.group_service.InviteMembers"
+	logs.Info(ctx, funcName, "邀请入群",
+		zap.Int64("user_id", userID), zap.Int64("group_id", groupID), zap.Int("count", len(targetIDs)))
+
+	group, _, err := s.checkGroupAdmin(ctx, groupID, userID)
+	if err != nil {
+		return err
+	}
+
+	count, err := s.groupDAO.GetMemberCount(ctx, group.ConversationID)
+	if err != nil {
+		return err
+	}
+	if int(count)+len(targetIDs) > group.MaxMembers {
+		return ErrGroupFull
+	}
+
+	addedIDs := make([]int64, 0, len(targetIDs))
+	for _, uid := range targetIDs {
+		existing, _ := s.groupDAO.GetMember(ctx, group.ConversationID, uid)
+		if existing != nil {
+			continue
+		}
+		if err := s.groupDAO.AddMember(ctx, group.ConversationID, uid, constants.GroupRoleNormal); err != nil {
+			logs.Error(ctx, funcName, "添加成员失败", zap.Int64("target_id", uid), zap.Error(err))
+			return err
+		}
+		addedIDs = append(addedIDs, uid)
+	}
+
+	if len(addedIDs) > 0 {
+		inviterName := s.getUserNickname(ctx, userID)
+		addedNames := s.getUserNicknames(ctx, addedIDs)
+		s.writeSystemMessage(ctx, group.ConversationID,
+			fmt.Sprintf("%s 邀请 %s 加入了群聊", inviterName, joinNames(addedNames)))
+
+		s.pushToGroupMembers(ctx, group.ConversationID, 0, "group.member.join", map[string]interface{}{
+			"group_id":        groupID,
+			"conversation_id": group.ConversationID,
+			"user_ids":        addedIDs,
+			"operator_id":     userID,
+		})
+	}
+
+	return nil
+}
+
+// KickMember 踢出群成员（群主/管理员，不能操作同级或更高权限的成员）
+func (s *GroupService) KickMember(ctx context.Context, userID, groupID, targetID int64) error {
+	funcName := "service.group_service.KickMember"
+	logs.Info(ctx, funcName, "踢出成员",
+		zap.Int64("user_id", userID), zap.Int64("group_id", groupID), zap.Int64("target_id", targetID))
+
+	group, operatorMember, err := s.checkGroupAdmin(ctx, groupID, userID)
+	if err != nil {
+		return err
+	}
+
+	targetMember, err := s.groupDAO.GetMember(ctx, group.ConversationID, targetID)
+	if err != nil {
+		if errors.Is(err, gorm.ErrRecordNotFound) {
+			return ErrNotGroupMember
+		}
+		return err
+	}
+
+	if targetMember.Role >= operatorMember.Role {
+		return ErrCannotKickHigherRole
+	}
+
+	if err := s.groupDAO.RemoveMember(ctx, group.ConversationID, targetID); err != nil {
+		return err
+	}
+
+	targetName := s.getUserNickname(ctx, targetID)
+	s.writeSystemMessage(ctx, group.ConversationID,
+		fmt.Sprintf("%s 被移出了群聊", targetName))
+
+	s.pushToGroupMembers(ctx, group.ConversationID, 0, "group.member.kicked", map[string]interface{}{
+		"group_id":        groupID,
+		"conversation_id": group.ConversationID,
+		"user_id":         targetID,
+		"operator_id":     userID,
+	})
+	s.pushToUser(ctx, targetID, "group.member.kicked", map[string]interface{}{
+		"group_id":        groupID,
+		"conversation_id": group.ConversationID,
+		"user_id":         targetID,
+		"operator_id":     userID,
+	})
+
+	return nil
+}
+
+// SetMemberRole 设置/取消管理员（仅群主）
+func (s *GroupService) SetMemberRole(ctx context.Context, userID, groupID, targetID int64, role int) error {
+	funcName := "service.group_service.SetMemberRole"
+	logs.Info(ctx, funcName, "设置成员角色",
+		zap.Int64("user_id", userID), zap.Int64("group_id", groupID),
+		zap.Int64("target_id", targetID), zap.Int("role", role))
+
+	group, err := s.getActiveGroup(ctx, groupID)
+	if err != nil {
+		return err
+	}
+	if group.OwnerID != userID {
+		return ErrNotGroupOwner
+	}
+
+	_, err = s.groupDAO.GetMember(ctx, group.ConversationID, targetID)
+	if err != nil {
+		if errors.Is(err, gorm.ErrRecordNotFound) {
+			return ErrNotGroupMember
+		}
+		return err
+	}
+
+	if err := s.groupDAO.UpdateMemberRole(ctx, group.ConversationID, targetID, role); err != nil {
+		return err
+	}
+
+	targetName := s.getUserNickname(ctx, targetID)
+	if role == constants.GroupRoleAdmin {
+		s.writeSystemMessage(ctx, group.ConversationID, fmt.Sprintf("%s 被设为管理员", targetName))
+	} else {
+		s.writeSystemMessage(ctx, group.ConversationID, fmt.Sprintf("%s 被取消管理员", targetName))
+	}
+
+	s.pushToGroupMembers(ctx, group.ConversationID, 0, "group.role.update", map[string]interface{}{
+		"group_id":        groupID,
+		"conversation_id": group.ConversationID,
+		"user_id":         targetID,
+		"role":            role,
+		"operator_id":     userID,
+	})
+
+	return nil
+}
+
+// MuteMember 禁言/解除禁言成员（群主/管理员）
+func (s *GroupService) MuteMember(ctx context.Context, userID, groupID, targetID int64, isMuted bool) error {
+	funcName := "service.group_service.MuteMember"
+	logs.Info(ctx, funcName, "更新禁言状态",
+		zap.Int64("user_id", userID), zap.Int64("group_id", groupID),
+		zap.Int64("target_id", targetID), zap.Bool("is_muted", isMuted))
+
+	if userID == targetID {
+		return ErrCannotMuteSelf
+	}
+
+	group, operatorMember, err := s.checkGroupAdmin(ctx, groupID, userID)
+	if err != nil {
+		return err
+	}
+
+	targetMember, err := s.groupDAO.GetMember(ctx, group.ConversationID, targetID)
+	if err != nil {
+		if errors.Is(err, gorm.ErrRecordNotFound) {
+			return ErrNotGroupMember
+		}
+		return err
+	}
+
+	if targetMember.Role >= operatorMember.Role {
+		return ErrCannotKickHigherRole
+	}
+
+	if err := s.groupDAO.UpdateMemberMuted(ctx, group.ConversationID, targetID, isMuted); err != nil {
+		return err
+	}
+
+	s.pushToGroupMembers(ctx, group.ConversationID, 0, "group.mute.update", map[string]interface{}{
+		"group_id":        groupID,
+		"conversation_id": group.ConversationID,
+		"user_id":         targetID,
+		"is_muted":        isMuted,
+		"operator_id":     userID,
+	})
+
+	return nil
+}
+
+// LeaveGroup 退出群聊（群主不能退出，需先转让）
+func (s *GroupService) LeaveGroup(ctx context.Context, userID, groupID int64) error {
+	funcName := "service.group_service.LeaveGroup"
+	logs.Info(ctx, funcName, "退出群聊",
+		zap.Int64("user_id", userID), zap.Int64("group_id", groupID))
+
+	group, err := s.getActiveGroup(ctx, groupID)
+	if err != nil {
+		return err
+	}
+	if group.OwnerID == userID {
+		return ErrOwnerCannotLeave
+	}
+
+	_, err = s.groupDAO.GetMember(ctx, group.ConversationID, userID)
+	if err != nil {
+		if errors.Is(err, gorm.ErrRecordNotFound) {
+			return ErrNotGroupMember
+		}
+		return err
+	}
+
+	if err := s.groupDAO.RemoveMember(ctx, group.ConversationID, userID); err != nil {
+		return err
+	}
+
+	userName := s.getUserNickname(ctx, userID)
+	s.writeSystemMessage(ctx, group.ConversationID, fmt.Sprintf("%s 退出了群聊", userName))
+
+	s.pushToGroupMembers(ctx, group.ConversationID, 0, "group.member.leave", map[string]interface{}{
+		"group_id":        groupID,
+		"conversation_id": group.ConversationID,
+		"user_id":         userID,
+	})
+
+	return nil
+}
+
+// TransferOwner 转让群主（仅群主）
+func (s *GroupService) TransferOwner(ctx context.Context, userID, groupID, newOwnerID int64) error {
+	funcName := "service.group_service.TransferOwner"
+	logs.Info(ctx, funcName, "转让群主",
+		zap.Int64("user_id", userID), zap.Int64("group_id", groupID), zap.Int64("new_owner", newOwnerID))
+
+	group, err := s.getActiveGroup(ctx, groupID)
+	if err != nil {
+		return err
+	}
+	if group.OwnerID != userID {
+		return ErrNotGroupOwner
+	}
+
+	_, err = s.groupDAO.GetMember(ctx, group.ConversationID, newOwnerID)
+	if err != nil {
+		if errors.Is(err, gorm.ErrRecordNotFound) {
+			return ErrNotGroupMember
+		}
+		return err
+	}
+
+	if err := s.groupDAO.TransferOwner(ctx, groupID, userID, newOwnerID, group.ConversationID); err != nil {
+		return err
+	}
+
+	oldOwnerName := s.getUserNickname(ctx, userID)
+	newOwnerName := s.getUserNickname(ctx, newOwnerID)
+	s.writeSystemMessage(ctx, group.ConversationID,
+		fmt.Sprintf("%s 将群主转让给了 %s", oldOwnerName, newOwnerName))
+
+	s.pushToGroupMembers(ctx, group.ConversationID, 0, "group.owner.transfer", map[string]interface{}{
+		"group_id":        groupID,
+		"conversation_id": group.ConversationID,
+		"old_owner_id":    userID,
+		"new_owner_id":    newOwnerID,
+	})
+
+	return nil
+}
+
+// UpdateNickname 修改群内昵称
+func (s *GroupService) UpdateNickname(ctx context.Context, userID, groupID int64, nickname string) error {
+	funcName := "service.group_service.UpdateNickname"
+	logs.Info(ctx, funcName, "修改群昵称",
+		zap.Int64("user_id", userID), zap.Int64("group_id", groupID))
+
+	group, err := s.getActiveGroup(ctx, groupID)
+	if err != nil {
+		return err
+	}
+
+	_, err = s.groupDAO.GetMember(ctx, group.ConversationID, userID)
+	if err != nil {
+		if errors.Is(err, gorm.ErrRecordNotFound) {
+			return ErrNotGroupMember
+		}
+		return err
+	}
+
+	return s.groupDAO.UpdateMemberNickname(ctx, group.ConversationID, userID, nickname)
+}
+
+// SubmitJoinRequest 提交入群申请
+func (s *GroupService) SubmitJoinRequest(ctx context.Context, userID, groupID int64, message string) error {
+	funcName := "service.group_service.SubmitJoinRequest"
+	logs.Info(ctx, funcName, "提交入群申请",
+		zap.Int64("user_id", userID), zap.Int64("group_id", groupID))
+
+	group, err := s.getActiveGroup(ctx, groupID)
+	if err != nil {
+		return err
+	}
+
+	existing, _ := s.groupDAO.GetMember(ctx, group.ConversationID, userID)
+	if existing != nil {
+		return ErrAlreadyMember
+	}
+
+	pending, _ := s.joinRequestDAO.GetPendingByGroupAndUser(ctx, groupID, userID)
+	if pending != nil {
+		return ErrPendingRequestExists
+	}
+
+	req, err := s.joinRequestDAO.Create(ctx, groupID, userID, message)
+	if err != nil {
+		return err
+	}
+
+	adminIDs, _ := s.groupDAO.GetAdminIDs(ctx, group.ConversationID)
+	userName := s.getUserNickname(ctx, userID)
+	s.pushToMembers(ctx, adminIDs, 0, "group.join.request", map[string]interface{}{
+		"group_id":      groupID,
+		"request_id":    req.ID,
+		"user_id":       userID,
+		"user_nickname": userName,
+		"message":       message,
+	})
+
+	return nil
+}
+
+// GetJoinRequests 获取入群申请列表（群主/管理员）
+func (s *GroupService) GetJoinRequests(ctx context.Context, userID, groupID int64) ([]dto.JoinRequestDTO, error) {
+	funcName := "service.group_service.GetJoinRequests"
+	logs.Debug(ctx, funcName, "获取入群申请列表",
+		zap.Int64("user_id", userID), zap.Int64("group_id", groupID))
+
+	_, _, err := s.checkGroupAdmin(ctx, groupID, userID)
+	if err != nil {
+		return nil, err
+	}
+
+	requests, err := s.joinRequestDAO.GetListByGroup(ctx, groupID)
+	if err != nil {
+		return nil, err
+	}
+
+	userIDs := make([]int64, 0, len(requests))
+	for _, r := range requests {
+		userIDs = append(userIDs, r.UserID)
+	}
+
+	userMap := make(map[int64]*authModel.User)
+	if len(userIDs) > 0 && s.userInfo != nil {
+		users, uErr := s.userInfo.GetUsersByIDs(ctx, userIDs)
+		if uErr != nil {
+			logs.Error(ctx, funcName, "批量查询用户信息失败", zap.Error(uErr))
+		} else {
+			for i := range users {
+				userMap[users[i].ID] = &users[i]
+			}
+		}
+	}
+
+	list := make([]dto.JoinRequestDTO, 0, len(requests))
+	for _, r := range requests {
+		item := dto.JoinRequestDTO{
+			ID:        r.ID,
+			GroupID:   r.GroupID,
+			UserID:    r.UserID,
+			Message:   r.Message,
+			Status:    r.Status,
+			CreatedAt: r.CreatedAt.Format("2006-01-02 15:04:05"),
+		}
+		if user, ok := userMap[r.UserID]; ok {
+			item.UserNickname = user.Nickname
+			item.UserAvatar = user.Avatar
+		}
+		list = append(list, item)
+	}
+
+	return list, nil
+}
+
+// ReviewJoinRequest 审批入群申请（群主/管理员）
+func (s *GroupService) ReviewJoinRequest(ctx context.Context, userID, groupID, requestID int64, action string) error {
+	funcName := "service.group_service.ReviewJoinRequest"
+	logs.Info(ctx, funcName, "审批入群申请",
+		zap.Int64("user_id", userID), zap.Int64("request_id", requestID), zap.String("action", action))
+
+	group, _, err := s.checkGroupAdmin(ctx, groupID, userID)
+	if err != nil {
+		return err
+	}
+
+	req, err := s.joinRequestDAO.GetByID(ctx, requestID)
+	if err != nil {
+		if errors.Is(err, gorm.ErrRecordNotFound) {
+			return ErrJoinRequestNotFound
+		}
+		return err
+	}
+
+	if req.GroupID != groupID || req.Status != constants.JoinRequestStatusPending {
+		return ErrJoinRequestNotFound
+	}
+
+	if action == "approve" {
+		count, _ := s.groupDAO.GetMemberCount(ctx, group.ConversationID)
+		if int(count) >= group.MaxMembers {
+			return ErrGroupFull
+		}
+
+		if err := s.joinRequestDAO.Approve(ctx, requestID, userID); err != nil {
+			return err
+		}
+		if err := s.groupDAO.AddMember(ctx, group.ConversationID, req.UserID, constants.GroupRoleNormal); err != nil {
+			return err
+		}
+
+		newMemberName := s.getUserNickname(ctx, req.UserID)
+		s.writeSystemMessage(ctx, group.ConversationID, fmt.Sprintf("%s 加入了群聊", newMemberName))
+
+		s.pushToUser(ctx, req.UserID, "group.join.approved", map[string]interface{}{
+			"group_id":        groupID,
+			"conversation_id": group.ConversationID,
+			"request_id":      requestID,
+		})
+
+		s.pushToGroupMembers(ctx, group.ConversationID, 0, "group.member.join", map[string]interface{}{
+			"group_id":        groupID,
+			"conversation_id": group.ConversationID,
+			"user_ids":        []int64{req.UserID},
+		})
+
+		return nil
+	}
+
+	return s.joinRequestDAO.Reject(ctx, requestID, userID)
+}
+
+// SearchGroups 搜索公开群
+func (s *GroupService) SearchGroups(ctx context.Context, req *dto.SearchGroupRequest) (*dto.SearchGroupResponse, error) {
+	funcName := "service.group_service.SearchGroups"
+	logs.Debug(ctx, funcName, "搜索群聊", zap.String("keyword", req.Keyword))
+
+	page := req.Page
+	if page <= 0 {
+		page = 1
+	}
+	pageSize := req.PageSize
+	if pageSize <= 0 {
+		pageSize = 20
+	}
+	offset := (page - 1) * pageSize
+
+	groups, total, err := s.groupDAO.SearchGroups(ctx, req.Keyword, offset, pageSize)
+	if err != nil {
+		return nil, err
+	}
+
+	list := make([]dto.GroupDTO, 0, len(groups))
+	for _, g := range groups {
+		count, _ := s.groupDAO.GetMemberCount(ctx, g.ConversationID)
+		list = append(list, *s.toGroupDTO(&g, int(count)))
+	}
+
+	return &dto.SearchGroupResponse{List: list, Total: total}, nil
+}
+
+// SetAllMuted 设置/取消全体禁言（群主/管理员）
+func (s *GroupService) SetAllMuted(ctx context.Context, userID, groupID int64, isMuted bool) error {
+	funcName := "service.group_service.SetAllMuted"
+	logs.Info(ctx, funcName, "设置全体禁言",
+		zap.Int64("user_id", userID), zap.Int64("group_id", groupID), zap.Bool("is_muted", isMuted))
+
+	group, _, err := s.checkGroupAdmin(ctx, groupID, userID)
+	if err != nil {
+		return err
+	}
+
+	if err := s.groupDAO.SetAllMuted(ctx, groupID, isMuted); err != nil {
+		return err
+	}
+
+	operatorName := s.getUserNickname(ctx, userID)
+	if isMuted {
+		s.writeSystemMessage(ctx, group.ConversationID, fmt.Sprintf("%s 开启了全体禁言", operatorName))
+	} else {
+		s.writeSystemMessage(ctx, group.ConversationID, fmt.Sprintf("%s 关闭了全体禁言", operatorName))
+	}
+
+	s.pushToGroupMembers(ctx, group.ConversationID, 0, "group.mute.update", map[string]interface{}{
+		"group_id":        groupID,
+		"conversation_id": group.ConversationID,
+		"is_all_muted":    isMuted,
+		"operator_id":     userID,
+	})
+
+	return nil
+}
+
+// ====== 内部辅助方法 ======
+
+// getActiveGroup 获取群聊并校验是否存在且未解散
+func (s *GroupService) getActiveGroup(ctx context.Context, groupID int64) (*model.Group, error) {
+	group, err := s.groupDAO.GetByID(ctx, groupID)
+	if err != nil {
+		if errors.Is(err, gorm.ErrRecordNotFound) {
+			return nil, ErrGroupNotFound
+		}
+		return nil, err
+	}
+	if group.Status == constants.GroupStatusDissolved {
+		return nil, ErrGroupDissolved
+	}
+	return group, nil
+}
+
+// checkGroupAdmin 校验用户是群主或管理员
+func (s *GroupService) checkGroupAdmin(ctx context.Context, groupID, userID int64) (*model.Group, *imMember, error) {
+	group, err := s.getActiveGroup(ctx, groupID)
+	if err != nil {
+		return nil, nil, err
+	}
+
+	member, err := s.groupDAO.GetMember(ctx, group.ConversationID, userID)
+	if err != nil {
+		if errors.Is(err, gorm.ErrRecordNotFound) {
+			return nil, nil, ErrNotGroupMember
+		}
+		return nil, nil, err
+	}
+
+	if member.Role < constants.GroupRoleAdmin {
+		return nil, nil, ErrNotGroupAdmin
+	}
+
+	return group, &imMember{
+		UserID: member.UserID,
+		Role:   member.Role,
+	}, nil
+}
+
+// imMember 内部使用的成员简要信息
+type imMember struct {
+	UserID int64
+	Role   int
+}
+
+// ====== 推送和系统消息辅助方法 ======
+
+// pushToUser 向单个用户推送通知
+func (s *GroupService) pushToUser(ctx context.Context, userID int64, event string, data interface{}) {
+	if s.pubsub == nil {
+		return
+	}
+	push := ws.NewPushMessage(event, data)
+	bytes, err := ws.MarshalPush(push)
+	if err != nil {
+		logs.Error(ctx, "service.group_service.pushToUser", "序列化推送消息失败", zap.Error(err))
+		return
+	}
+	if err := s.pubsub.Publish(ctx, userID, bytes); err != nil {
+		logs.Error(ctx, "service.group_service.pushToUser", "推送失败",
+			zap.Int64("user_id", userID), zap.Error(err))
+	}
+}
+
+// pushToMembers 向指定用户列表推送通知（排除 excludeUID）
+func (s *GroupService) pushToMembers(ctx context.Context, memberIDs []int64, excludeUID int64, event string, data interface{}) {
+	if s.pubsub == nil || len(memberIDs) == 0 {
+		return
+	}
+	push := ws.NewPushMessage(event, data)
+	bytes, err := ws.MarshalPush(push)
+	if err != nil {
+		logs.Error(ctx, "service.group_service.pushToMembers", "序列化推送消息失败", zap.Error(err))
+		return
+	}
+	for _, uid := range memberIDs {
+		if uid == excludeUID {
+			continue
+		}
+		if pErr := s.pubsub.Publish(ctx, uid, bytes); pErr != nil {
+			logs.Error(ctx, "service.group_service.pushToMembers", "推送失败",
+				zap.Int64("user_id", uid), zap.Error(pErr))
+		}
+	}
+}
+
+// pushToGroupMembers 向群所有成员推送通知（通过 conversationID 查成员）
+func (s *GroupService) pushToGroupMembers(ctx context.Context, conversationID int64, excludeUID int64, event string, data interface{}) {
+	memberIDs, err := s.groupDAO.GetMemberIDs(ctx, conversationID)
+	if err != nil {
+		logs.Error(ctx, "service.group_service.pushToGroupMembers", "获取成员列表失败", zap.Error(err))
+		return
+	}
+	s.pushToMembers(ctx, memberIDs, excludeUID, event, data)
+}
+
+// writeSystemMessage 写入系统消息到群会话
+func (s *GroupService) writeSystemMessage(ctx context.Context, conversationID int64, content string) {
+	if s.msgWriter == nil {
+		return
+	}
+	msg := &imModel.Message{
+		ConversationID: conversationID,
+		SenderID:       0,
+		Type:           constants.MessageTypeSystem,
+		Content:        content,
+		Status:         constants.MessageStatusNormal,
+	}
+	if err := s.msgWriter.Create(ctx, msg); err != nil {
+		logs.Error(ctx, "service.group_service.writeSystemMessage", "写入系统消息失败", zap.Error(err))
+	}
+}
+
+// getUserNickname 获取单个用户昵称（推送文案使用，查询失败返回默认值）
+func (s *GroupService) getUserNickname(ctx context.Context, userID int64) string {
+	if s.userInfo == nil {
+		return "用户"
+	}
+	users, err := s.userInfo.GetUsersByIDs(ctx, []int64{userID})
+	if err != nil || len(users) == 0 {
+		return "用户"
+	}
+	return users[0].Nickname
+}
+
+// getUserNicknames 批量获取用户昵称列表
+func (s *GroupService) getUserNicknames(ctx context.Context, userIDs []int64) []string {
+	if s.userInfo == nil || len(userIDs) == 0 {
+		return nil
+	}
+	users, err := s.userInfo.GetUsersByIDs(ctx, userIDs)
+	if err != nil {
+		return nil
+	}
+	nameMap := make(map[int64]string, len(users))
+	for _, u := range users {
+		nameMap[u.ID] = u.Nickname
+	}
+	names := make([]string, 0, len(userIDs))
+	for _, id := range userIDs {
+		if n, ok := nameMap[id]; ok {
+			names = append(names, n)
+		}
+	}
+	return names
+}
+
+// joinNames 将名称列表用顿号连接（中文习惯）
+func joinNames(names []string) string {
+	if len(names) == 0 {
+		return ""
+	}
+	result := names[0]
+	for i := 1; i < len(names); i++ {
+		result += "、" + names[i]
+	}
+	return result
+}
+
+// toGroupDTO 将 model.Group 转换为 dto.GroupDTO
+func (s *GroupService) toGroupDTO(g *model.Group, memberCount int) *dto.GroupDTO {
+	return &dto.GroupDTO{
+		ID:             g.ID,
+		ConversationID: g.ConversationID,
+		Name:           g.Name,
+		Avatar:         g.Avatar,
+		OwnerID:        g.OwnerID,
+		Notice:         g.Notice,
+		MaxMembers:     g.MaxMembers,
+		MemberCount:    memberCount,
+		IsSearchable:   g.IsSearchable,
+		IsAllMuted:     g.IsAllMuted,
+		Status:         g.Status,
+		CreatedAt:      g.CreatedAt.Format("2006-01-02 15:04:05"),
+	}
+}
--- a/backend/go-service/app/im/controller/im_controller.go
+++ b/backend/go-service/app/im/controller/im_controller.go
@@ -180,6 +180,30 @@ func (ctl *IMController) GetTotalUnread(c *gin.Context) {
 	utils.ResponseOK(c, gin.H{"total_unread": count})
 }

+// GetMessageReadDetail 获取消息已读详情
+// GET /api/v1/im/messages/:id/reads
+func (ctl *IMController) GetMessageReadDetail(c *gin.Context) {
+	ctx := c.Request.Context()
+	userID, ok := middleware.GetCurrentUserID(c)
+	if !ok {
+		utils.ResponseUnauthorized(c, "无法获取当前用户信息")
+		return
+	}
+
+	messageID, err := strconv.ParseInt(c.Param("id"), 10, 64)
+	if err != nil {
+		utils.ResponseBadRequest(c, "消息 ID 格式错误")
+		return
+	}
+
+	result, err := ctl.imService.GetMessageReadDetail(ctx, userID, messageID)
+	if err != nil {
+		ctl.handleError(c, err, "获取已读详情失败")
+		return
+	}
+	utils.ResponseOK(c, result)
+}
+
 // handleError 统一业务错误映射
 // 已知业务错误 → 返回 Service 层定义的具体提示
 // 未知错误 → 返回 fallbackMsg（未传则默认"服务器内部错误"）
@@ -203,6 +227,12 @@ func (ctl *IMController) handleError(c *gin.Context, err error, fallbackMsg ...s
 		utils.ResponseForbidden(c, err.Error())
 	case service.ErrDuplicateMsg:
 		utils.ResponseBadRequest(c, err.Error())
+	case service.ErrGroupDissolved:
+		utils.ResponseBadRequest(c, err.Error())
+	case service.ErrGroupAllMuted:
+		utils.ResponseForbidden(c, err.Error())
+	case service.ErrUserMuted:
+		utils.ResponseForbidden(c, err.Error())
 	default:
 		msg := "服务器内部错误"
 		if len(fallbackMsg) > 0 && fallbackMsg[0] != "" {
--- a/backend/go-service/app/im/dao/conversation_dao.go
+++ b/backend/go-service/app/im/dao/conversation_dao.go
@@ -86,13 +86,14 @@ func (d *ConversationDAO) GetUserConversations(ctx context.Context, userID int64
 	err := d.db.WithContext(ctx).
 		Raw(`SELECT c.id, c.type, c.last_message_id, c.last_msg_content, c.last_msg_time, c.last_msg_sender_id,
 			        cm.is_pinned, cm.unread_count, cm.clear_before_msg_id,
-			        peer.user_id AS peer_user_id
+			        cm.is_do_not_disturb, cm.at_me_count,
+			        COALESCE(peer.user_id, 0) AS peer_user_id
 			 FROM im_conversations c
 			 JOIN im_conversation_members cm ON cm.conversation_id = c.id AND cm.user_id = ?
-			 LEFT JOIN im_conversation_members peer ON peer.conversation_id = c.id AND peer.user_id != ?
+			 LEFT JOIN im_conversation_members peer ON peer.conversation_id = c.id AND peer.user_id != ? AND c.type = ?
 			 WHERE cm.is_deleted = false
 			 ORDER BY cm.is_pinned DESC, c.last_msg_time DESC NULLS LAST`,
-			userID, userID).
+			userID, userID, constants.ConversationTypePrivate).
 		Scan(&results).Error

 	if err != nil {
@@ -112,6 +113,8 @@ type ConversationWithMember struct {
 	IsPinned         bool       `json:"is_pinned"`
 	UnreadCount      int        `json:"unread_count"`
 	ClearBeforeMsgID int64      `json:"clear_before_msg_id"`
+	IsDoNotDisturb   bool       `json:"is_do_not_disturb"`
+	AtMeCount        int        `json:"at_me_count"`
 	PeerUserID       int64      `json:"peer_user_id"`
 }

@@ -216,6 +219,44 @@ func (d *ConversationDAO) IncrementUnread(ctx context.Context, conversationID, u
 		UpdateColumn("unread_count", gorm.Expr("unread_count + 1")).Error
 }

+// IncrementAtMeCount 将指定成员的 @提醒计数 +1
+func (d *ConversationDAO) IncrementAtMeCount(ctx context.Context, conversationID, userID int64) error {
+	return d.db.WithContext(ctx).
+		Model(&model.ConversationMember{}).
+		Where("conversation_id = ? AND user_id = ?", conversationID, userID).
+		UpdateColumn("at_me_count", gorm.Expr("at_me_count + 1")).Error
+}
+
+// ClearAtMeCount 清零指定成员的 @提醒计数
+func (d *ConversationDAO) ClearAtMeCount(ctx context.Context, conversationID, userID int64) error {
+	return d.db.WithContext(ctx).
+		Model(&model.ConversationMember{}).
+		Where("conversation_id = ? AND user_id = ?", conversationID, userID).
+		Update("at_me_count", 0).Error
+}
+
+// GetMemberDNDMap 批量获取会话成员的免打扰状态（返回 userID → isDoNotDisturb 的映射）
+func (d *ConversationDAO) GetMemberDNDMap(ctx context.Context, conversationID int64) (map[int64]bool, error) {
+	type memberDND struct {
+		UserID         int64 `json:"user_id"`
+		IsDoNotDisturb bool  `json:"is_do_not_disturb"`
+	}
+	var members []memberDND
+	err := d.db.WithContext(ctx).
+		Model(&model.ConversationMember{}).
+		Select("user_id, is_do_not_disturb").
+		Where("conversation_id = ?", conversationID).
+		Scan(&members).Error
+	if err != nil {
+		return nil, err
+	}
+	result := make(map[int64]bool, len(members))
+	for _, m := range members {
+		result[m.UserID] = m.IsDoNotDisturb
+	}
+	return result, nil
+}
+
 // ClearUnread 清零指定成员的未读消息数
 func (d *ConversationDAO) ClearUnread(ctx context.Context, conversationID, userID int64, lastMsgID int64) error {
 	return d.db.WithContext(ctx).
--- a/backend/go-service/app/im/handler/event_handler.go
+++ b/backend/go-service/app/im/handler/event_handler.go
@@ -34,6 +34,7 @@ func (h *EventHandler) registerEvents() {
 	h.hub.RegisterEvent("im.message.send", h.handleSendMessage)
 	h.hub.RegisterEvent("im.message.recall", h.handleRecallMessage)
 	h.hub.RegisterEvent("im.conversation.read", h.handleMarkRead)
+	h.hub.RegisterEvent("im.group.read", h.handleGroupRead)
 	h.hub.RegisterEvent("im.typing", h.handleTyping)
 }

@@ -111,6 +112,29 @@ func (h *EventHandler) handleMarkRead(client *ws.Client, msg *ws.Message) {
 	h.sendACK(client, msg, 0, "ok", nil)
 }

+// handleGroupRead 处理群聊消息标记已读事件
+func (h *EventHandler) handleGroupRead(client *ws.Client, msg *ws.Message) {
+	funcName := "handler.event_handler.handleGroupRead"
+	ctx := context.Background()
+
+	var req dto.MarkGroupReadRequest
+	if err := json.Unmarshal(msg.Data, &req); err != nil {
+		logs.Warn(ctx, funcName, "解析群已读请求失败",
+			zap.Int64("user_id", client.UserID), zap.Error(err))
+		h.sendACK(client, msg, -1, "请求参数格式错误", nil)
+		return
+	}
+
+	if err := h.imService.MarkGroupMessagesRead(ctx, client.UserID, &req); err != nil {
+		logs.Warn(ctx, funcName, "群已读标记失败",
+			zap.Int64("user_id", client.UserID), zap.Error(err))
+		h.sendACK(client, msg, -1, err.Error(), nil)
+		return
+	}
+
+	h.sendACK(client, msg, 0, "ok", nil)
+}
+
 // handleTyping 处理正在输入事件（通过 PubSub 转发给对方，支持跨实例）
 func (h *EventHandler) handleTyping(client *ws.Client, msg *ws.Message) {
 	funcName := "handler.event_handler.handleTyping"
--- a/backend/go-service/app/im/model/conversation_member.go
+++ b/backend/go-service/app/im/model/conversation_member.go
@@ -4,6 +4,7 @@ import "time"

 // ConversationMember 会话成员模型，对应 im_conversation_members 表
 // 每个会话的每个成员一条记录，存储置顶/未读/软删除等个人视图
+// 群聊场景下额外使用 Role/Nickname/IsMuted/IsDoNotDisturb/JoinedAt/AtMeCount 字段
 type ConversationMember struct {
 	ID               int64      `json:"id" gorm:"primaryKey;autoIncrement"`                          // 记录唯一标识
 	ConversationID   int64      `json:"conversation_id" gorm:"not null;uniqueIndex:idx_conv_user"`   // 所属会话 ID
@@ -13,6 +14,12 @@ type ConversationMember struct {
 	UnreadCount      int        `json:"unread_count" gorm:"default:0"`                               // 该成员在此会话中的未读消息数
 	LastReadMsgID    int64      `json:"last_read_msg_id" gorm:"default:0"`                           // 该成员最后已读消息 ID
 	ClearBeforeMsgID int64      `json:"clear_before_msg_id" gorm:"default:0"`                        // 清空记录时的消息截止 ID（个人视图，不影响对方）
+	Role             int        `json:"role" gorm:"not null;default:0"`                              // 成员角色：0=普通成员，1=管理员，2=群主
+	Nickname         string     `json:"nickname" gorm:"size:50;default:''"`                          // 群内昵称（仅群聊有效）
+	IsMuted          bool       `json:"is_muted" gorm:"not null;default:false"`                      // 是否被禁言
+	IsDoNotDisturb   bool       `json:"is_do_not_disturb" gorm:"not null;default:false"`             // 是否消息免打扰
+	JoinedAt         *time.Time `json:"joined_at" gorm:"type:timestamp(0)"`                          // 加入群聊时间
+	AtMeCount        int        `json:"at_me_count" gorm:"default:0"`                                // 被@提醒未读计数
 	CreatedAt        time.Time  `json:"created_at" gorm:"not null;autoCreateTime;type:timestamp(0)"` // 加入会话时间
 	UpdatedAt        time.Time  `json:"updated_at" gorm:"not null;autoUpdateTime;type:timestamp(0)"` // 最后更新时间
 }
--- a/backend/go-service/app/im/model/message.go
+++ b/backend/go-service/app/im/model/message.go
@@ -1,19 +1,24 @@
 package model

-import "time"
+import (
+	"time"
+
+	"github.com/echochat/backend/pkg/utils"
+)

 // Message 消息模型，对应 im_messages 表
-// Type: 1=文本（预留 2=图片 3=语音 4=视频 5=文件）
+// Type: 1=文本（预留 2=图片 3=语音 4=视频 5=文件），10=系统消息
 // Status: 1=正常 2=已撤回 3=已删除
 type Message struct {
 	ID             int64            `json:"id" gorm:"primaryKey;autoIncrement"`                                       // 消息唯一标识，自增主键
 	ConversationID int64            `json:"conversation_id" gorm:"not null;index:idx_msg_conv_time;index:idx_msg_conv_id"` // 所属会话 ID
-	SenderID       int64     `json:"sender_id" gorm:"not null"`                                                // 发送者用户 ID
-	Type           int       `json:"type" gorm:"not null;default:1"`                                           // 消息类型：1=文本（预留扩展）
+	SenderID       int64            `json:"sender_id" gorm:"not null"`                                                // 发送者用户 ID（系统消息为 0）
+	Type           int              `json:"type" gorm:"not null;default:1"`                                           // 消息类型：1=文本，10=系统消息
 	Content        string           `json:"content" gorm:"type:text;not null"`                                        // 消息内容
 	Extra          *string          `json:"extra" gorm:"type:jsonb"`                                                  // 扩展数据（JSON 格式，预留图片/语音等元信息）
 	Status         int              `json:"status" gorm:"not null;default:1"`                                         // 消息状态：1=正常，2=已撤回，3=已删除
 	ClientMsgID    string           `json:"client_msg_id" gorm:"size:64;default:''"`                                  // 客户端消息唯一 ID，用于幂等去重
+	AtUserIDs      utils.Int64Array `json:"at_user_ids" gorm:"type:bigint[]"`                                         // @提醒用户 ID 列表，nil=无@，含 0 表示 @所有人
 	CreatedAt      time.Time        `json:"created_at" gorm:"not null;autoCreateTime;type:timestamp(0)"`              // 消息发送时间
 }

--- a/backend/go-service/app/im/provider.go
+++ b/backend/go-service/app/im/provider.go
@@ -22,7 +22,8 @@ func ProvideMessageDAO(db *gorm.DB) *dao.MessageDAO {
 }

 // ProvideIMService 创建 IMService 实例
-// friendChecker 和 userInfoGetter 由 contact 模块的 FriendshipDAO 隐式实现
+// friendChecker / userInfoGetter 由 contact.FriendshipDAO 隐式实现
+// groupInfo 由 group.GroupDAO 隐式实现
 func ProvideIMService(
 	convDAO *dao.ConversationDAO,
 	msgDAO *dao.MessageDAO,
@@ -30,8 +31,10 @@ func ProvideIMService(
 	rdb *redis.Client,
 	friendChecker service.FriendChecker,
 	userInfoGetter service.UserInfoGetter,
+	groupInfo service.GroupInfoGetter,
+	readRecorder service.MessageReadRecorder,
 ) *service.IMService {
-	return service.NewIMService(convDAO, msgDAO, pubsub, rdb, friendChecker, userInfoGetter)
+	return service.NewIMService(convDAO, msgDAO, pubsub, rdb, friendChecker, userInfoGetter, groupInfo, readRecorder)
 }

 // ProvideIMEventHandler 创建 IM WS 事件处理器并注册事件到 Hub
--- a/backend/go-service/app/im/router.go
+++ b/backend/go-service/app/im/router.go
@@ -23,5 +23,8 @@ func RegisterRoutes(r *gin.Engine, ctrl *controller.IMController, jwtAuth gin.Ha

 		// 未读数
 		authed.GET("/unread", ctrl.GetTotalUnread)
+
+		// 已读回执
+		authed.GET("/messages/:id/reads", ctrl.GetMessageReadDetail)
 	}
 }
--- a/backend/go-service/app/im/service/im_service.go
+++ b/backend/go-service/app/im/service/im_service.go
@@ -32,6 +32,9 @@ var (
 	ErrNotMember        = errors.New("你不是该会话的成员")
 	ErrDuplicateMsg     = errors.New("重复消息")
 	ErrInvalidMsgType   = errors.New("不支持的消息类型")
+	ErrGroupDissolved   = errors.New("群聊已解散")
+	ErrGroupAllMuted    = errors.New("当前群已开启全体禁言")
+	ErrUserMuted        = errors.New("你已被禁言，无法发送消息")
 )

 // IMService 即时通讯核心业务服务
@@ -42,6 +45,8 @@ type IMService struct {
 	rdb            *redis.Client
 	friendChecker  FriendChecker
 	userInfoGetter UserInfoGetter
+	groupInfo      GroupInfoGetter
+	readRecorder   MessageReadRecorder
 }

 // NewIMService 创建 IMService 实例
@@ -52,6 +57,8 @@ func NewIMService(
 	rdb *redis.Client,
 	friendChecker FriendChecker,
 	userInfoGetter UserInfoGetter,
+	groupInfo GroupInfoGetter,
+	readRecorder MessageReadRecorder,
 ) *IMService {
 	return &IMService{
 		convDAO:        convDAO,
@@ -60,15 +67,14 @@ func NewIMService(
 		rdb:            rdb,
 		friendChecker:  friendChecker,
 		userInfoGetter: userInfoGetter,
+		groupInfo:      groupInfo,
+		readRecorder:   readRecorder,
 	}
 }

-// SendMessage 发送消息（核心流程）
-// 1. 校验好友关系
-// 2. 查找或创建会话
-// 3. 幂等去重（client_msg_id）
-// 4. 写入消息 + 更新会话最后消息 + 递增对方未读数
-// 5. 通过 PubSub 推送给接收方
+// SendMessage 发送消息（核心流程，同时支持单聊和群聊）
+// 单聊：校验好友关系 → 查找/创建会话 → 写入消息 → 推送给对方
+// 群聊：校验群成员+禁言 → 写入消息（含 @信息）→ 推送给所有群成员
 func (s *IMService) SendMessage(ctx context.Context, senderID int64, req *dto.SendMessageRequest) (*dto.MessageDTO, error) {
 	funcName := "service.im_service.SendMessage"
 	logs.Info(ctx, funcName, "发送消息",
@@ -87,9 +93,26 @@ func (s *IMService) SendMessage(ctx context.Context, senderID int64, req *dto.Se
 	}

 	convID := req.ConversationID
-	var peerID int64

 	if convID == 0 && req.TargetUserID > 0 {
+		return s.sendPrivateMessage(ctx, senderID, req)
+	} else if convID > 0 {
+		conv, err := s.convDAO.GetByID(ctx, convID)
+		if err != nil {
+			return nil, ErrConvNotFound
+		}
+		if conv.Type == constants.ConversationTypeGroup {
+			return s.sendGroupMessage(ctx, senderID, req)
+		}
+		return s.sendPrivateMessageByConvID(ctx, senderID, convID, req)
+	}
+	return nil, ErrConvNotFound
+}
+
+// sendPrivateMessage 发送单聊消息（首次发送，通过 TargetUserID）
+func (s *IMService) sendPrivateMessage(ctx context.Context, senderID int64, req *dto.SendMessageRequest) (*dto.MessageDTO, error) {
+	funcName := "service.im_service.sendPrivateMessage"
+
 	isFriend, err := s.friendChecker.IsFriend(ctx, senderID, req.TargetUserID)
 	if err != nil {
 		logs.Error(ctx, funcName, "检查好友关系失败", zap.Error(err))
@@ -103,25 +126,32 @@ func (s *IMService) SendMessage(ctx context.Context, senderID int64, req *dto.Se
 	if err != nil {
 		return nil, err
 	}
-		convID = conv.ID
-		peerID = req.TargetUserID
-	} else if convID > 0 {
+
+	return s.writeAndPushPrivateMessage(ctx, senderID, conv.ID, req.TargetUserID, req)
+}
+
+// sendPrivateMessageByConvID 发送单聊消息（已有会话 ID）
+func (s *IMService) sendPrivateMessageByConvID(ctx context.Context, senderID, convID int64, req *dto.SendMessageRequest) (*dto.MessageDTO, error) {
+	funcName := "service.im_service.sendPrivateMessageByConvID"
+
 	member, err := s.convDAO.GetMember(ctx, convID, senderID)
-		if err != nil {
+	if err != nil || member == nil {
 		return nil, ErrNotMember
 	}
-		if member == nil {
-			return nil, ErrNotMember
-		}
-		peerID, err = s.convDAO.GetPeerUserID(ctx, convID, senderID)
+
+	peerID, err := s.convDAO.GetPeerUserID(ctx, convID, senderID)
 	if err != nil {
 		logs.Error(ctx, funcName, "查询对方用户 ID 失败", zap.Error(err))
 		return nil, err
 	}
-	} else {
-		return nil, ErrConvNotFound
+
+	return s.writeAndPushPrivateMessage(ctx, senderID, convID, peerID, req)
 }

+// writeAndPushPrivateMessage 单聊：幂等去重 + 写消息 + 推送
+func (s *IMService) writeAndPushPrivateMessage(ctx context.Context, senderID, convID, peerID int64, req *dto.SendMessageRequest) (*dto.MessageDTO, error) {
+	funcName := "service.im_service.writeAndPushPrivateMessage"
+
 	if req.ClientMsgID != "" {
 		existing, err := s.msgDAO.FindByClientMsgID(ctx, convID, req.ClientMsgID)
 		if err != nil {
@@ -160,40 +190,161 @@ func (s *IMService) SendMessage(ctx context.Context, senderID int64, req *dto.Se

 	s.incrementTotalUnread(ctx, peerID)

-	pushData := map[string]interface{}{
-		"id":              msg.ID,
-		"conversation_id": convID,
-		"sender_id":       senderID,
-		"type":            msg.Type,
-		"content":         msg.Content,
-		"client_msg_id":   msg.ClientMsgID,
-		"created_at":      msg.CreatedAt.Format("2006-01-02 15:04:05"),
-	}
-	if senderUsers, sErr := s.userInfoGetter.GetUsersByIDs(ctx, []int64{senderID}); sErr == nil && len(senderUsers) > 0 {
-		pushData["sender_name"] = senderUsers[0].Nickname
-		pushData["sender_avatar"] = senderUsers[0].Avatar
-	}
+	pushData := s.buildMessagePushData(ctx, msg, senderID)
+	pushData["conv_type"] = constants.ConversationTypePrivate
 	s.pushToUser(ctx, peerID, "im.message.new", pushData)

 	return s.toMessageDTO(msg), nil
 }

-// RecallMessage 撤回消息（2分钟内）
-// 撤回成功后，若被撤回消息是会话最后一条，则同步更新会话预览文本
-func (s *IMService) RecallMessage(ctx context.Context, senderID int64, messageID int64) error {
+// sendGroupMessage 发送群聊消息
+func (s *IMService) sendGroupMessage(ctx context.Context, senderID int64, req *dto.SendMessageRequest) (*dto.MessageDTO, error) {
+	funcName := "service.im_service.sendGroupMessage"
+	convID := req.ConversationID
+
+	member, err := s.convDAO.GetMember(ctx, convID, senderID)
+	if err != nil || member == nil {
+		return nil, ErrNotMember
+	}
+
+	if s.groupInfo != nil {
+		groupBrief, gErr := s.groupInfo.GetGroupBrief(ctx, convID)
+		if gErr != nil {
+			logs.Error(ctx, funcName, "获取群信息失败", zap.Error(gErr))
+			return nil, ErrConvNotFound
+		}
+		if groupBrief.Status == constants.GroupStatusDissolved {
+			return nil, ErrGroupDissolved
+		}
+		if groupBrief.IsAllMuted && member.Role < constants.GroupRoleAdmin {
+			return nil, ErrGroupAllMuted
+		}
+	}
+
+	if member.IsMuted {
+		return nil, ErrUserMuted
+	}
+
+	if req.ClientMsgID != "" {
+		existing, err := s.msgDAO.FindByClientMsgID(ctx, convID, req.ClientMsgID)
+		if err != nil {
+			logs.Error(ctx, funcName, "幂等去重查询失败", zap.Error(err))
+			return nil, err
+		}
+		if existing != nil {
+			return s.toMessageDTO(existing), ErrDuplicateMsg
+		}
+	}
+
+	msg := &model.Message{
+		ConversationID: convID,
+		SenderID:       senderID,
+		Type:           req.Type,
+		Content:        req.Content,
+		Status:         constants.MessageStatusNormal,
+		ClientMsgID:    req.ClientMsgID,
+	}
+	if len(req.AtUserIDs) > 0 {
+		msg.AtUserIDs = req.AtUserIDs
+	}
+	if err := s.msgDAO.Create(ctx, msg); err != nil {
+		return nil, err
+	}
+
+	now := time.Now()
+	if err := s.convDAO.UpdateLastMessage(ctx, convID, msg.ID, truncateContent(req.Content, 100), senderID, now); err != nil {
+		logs.Error(ctx, funcName, "更新最后消息失败", zap.Error(err))
+	}
+
+	memberIDs, err := s.convDAO.GetConversationMemberIDs(ctx, convID)
+	if err != nil {
+		logs.Error(ctx, funcName, "获取群成员列表失败", zap.Error(err))
+		return s.toMessageDTO(msg), nil
+	}
+
+	dndMap, dndErr := s.convDAO.GetMemberDNDMap(ctx, convID)
+	if dndErr != nil {
+		logs.Error(ctx, funcName, "获取免打扰状态失败", zap.Error(dndErr))
+		dndMap = make(map[int64]bool)
+	}
+
+	pushData := s.buildMessagePushData(ctx, msg, senderID)
+	pushData["conv_type"] = constants.ConversationTypeGroup
+	if len(req.AtUserIDs) > 0 {
+		pushData["at_user_ids"] = req.AtUserIDs
+	}
+
+	for _, uid := range memberIDs {
+		if uid == senderID {
+			continue
+		}
+		if err := s.convDAO.IncrementUnread(ctx, convID, uid); err != nil {
+			logs.Error(ctx, funcName, "递增未读计数失败", zap.Int64("user_id", uid), zap.Error(err))
+		}
+
+		if !dndMap[uid] {
+			s.incrementTotalUnread(ctx, uid)
+		}
+
+		if len(req.AtUserIDs) > 0 {
+			isAtMe := false
+			for _, atID := range req.AtUserIDs {
+				if atID == uid || atID == 0 {
+					isAtMe = true
+					break
+				}
+			}
+			if isAtMe {
+				if err := s.convDAO.IncrementAtMeCount(ctx, convID, uid); err != nil {
+					logs.Error(ctx, funcName, "递增@计数失败", zap.Int64("user_id", uid), zap.Error(err))
+				}
+			}
+		}
+
+		s.pushToUser(ctx, uid, "im.message.new", pushData)
+	}
+
+	return s.toMessageDTO(msg), nil
+}
+
+// RecallMessage 撤回消息
+// 单聊：只能撤回自己的消息，2 分钟内
+// 群聊：自己的消息 2 分钟内撤回；群主/管理员可无时限撤回任何消息
+func (s *IMService) RecallMessage(ctx context.Context, operatorID int64, messageID int64) error {
 	funcName := "service.im_service.RecallMessage"
 	logs.Info(ctx, funcName, "撤回消息",
-		zap.Int64("sender_id", senderID), zap.Int64("message_id", messageID))
+		zap.Int64("operator_id", operatorID), zap.Int64("message_id", messageID))

 	msg, err := s.msgDAO.GetByID(ctx, messageID)
 	if err != nil {
 		return ErrMsgNotFound
 	}
-	if msg.SenderID != senderID {
+
+	conv, err := s.convDAO.GetByID(ctx, msg.ConversationID)
+	if err != nil {
+		logs.Error(ctx, funcName, "获取会话信息失败", zap.Error(err))
+		return ErrConvNotFound
+	}
+
+	isAdmin := false
+	if conv.Type == constants.ConversationTypeGroup {
+		member, mErr := s.convDAO.GetMember(ctx, msg.ConversationID, operatorID)
+		if mErr != nil || member == nil {
+			return ErrNotMember
+		}
+		isAdmin = member.Role >= constants.GroupRoleAdmin
+	}
+
+	if msg.SenderID == operatorID {
+		if time.Since(msg.CreatedAt).Seconds() > float64(constants.MessageRecallTimeLimit) {
+			if !isAdmin {
+				return ErrRecallTimeout
+			}
+		}
+	} else {
+		if !isAdmin {
 			return ErrNotSender
 		}
-	if time.Since(msg.CreatedAt).Seconds() > float64(constants.MessageRecallTimeLimit) {
-		return ErrRecallTimeout
 	}

 	if err := s.msgDAO.UpdateStatus(ctx, messageID, constants.MessageStatusRecalled); err != nil {
@@ -201,16 +352,31 @@ func (s *IMService) RecallMessage(ctx context.Context, senderID int64, messageID
 		return err
 	}

-	conv, err := s.convDAO.GetByID(ctx, msg.ConversationID)
-	if err != nil {
-		logs.Error(ctx, funcName, "获取会话信息失败", zap.Error(err))
-	} else if conv.LastMessageID != nil && *conv.LastMessageID == msg.ID {
-		senderInfo, infoErr := s.userInfoGetter.GetUsersByIDs(ctx, []int64{senderID})
 	recallText := "撤回了一条消息"
+	if msg.SenderID != operatorID && isAdmin {
+		operatorInfo, infoErr := s.userInfoGetter.GetUsersByIDs(ctx, []int64{operatorID, msg.SenderID})
+		operatorName := "管理员"
+		senderName := "成员"
+		if infoErr == nil {
+			for _, u := range operatorInfo {
+				if u.ID == operatorID {
+					operatorName = u.Nickname
+				}
+				if u.ID == msg.SenderID {
+					senderName = u.Nickname
+				}
+			}
+		}
+		recallText = fmt.Sprintf("管理员 %s 撤回了 %s 的一条消息", operatorName, senderName)
+	} else {
+		senderInfo, infoErr := s.userInfoGetter.GetUsersByIDs(ctx, []int64{operatorID})
 		if infoErr == nil && len(senderInfo) > 0 {
 			recallText = senderInfo[0].Nickname + " 撤回了一条消息"
 		}
-		if updateErr := s.convDAO.UpdateLastMessage(ctx, msg.ConversationID, msg.ID, recallText, senderID, msg.CreatedAt); updateErr != nil {
+	}
+
+	if conv.LastMessageID != nil && *conv.LastMessageID == msg.ID {
+		if updateErr := s.convDAO.UpdateLastMessage(ctx, msg.ConversationID, msg.ID, recallText, operatorID, msg.CreatedAt); updateErr != nil {
 			logs.Error(ctx, funcName, "更新会话预览失败", zap.Error(updateErr))
 		}
 	}
@@ -221,20 +387,22 @@ func (s *IMService) RecallMessage(ctx context.Context, senderID int64, messageID
 		return nil
 	}
 	for _, uid := range memberIDs {
-		if uid == senderID {
+		if uid == operatorID {
 			continue
 		}
 		s.pushToUser(ctx, uid, "im.message.recalled", map[string]interface{}{
 			"message_id":      messageID,
 			"conversation_id": msg.ConversationID,
-			"sender_id":       senderID,
+			"operator_id":     operatorID,
+			"sender_id":       msg.SenderID,
+			"recall_text":     recallText,
 		})
 	}

 	return nil
 }

-// GetConversationList 获取会话列表（含对方用户信息）
+// GetConversationList 获取会话列表（含对方用户信息 / 群聊信息）
 func (s *IMService) GetConversationList(ctx context.Context, userID int64) (*dto.ConversationListResponse, error) {
 	funcName := "service.im_service.GetConversationList"
 	logs.Debug(ctx, funcName, "获取会话列表", zap.Int64("user_id", userID))
@@ -245,17 +413,20 @@ func (s *IMService) GetConversationList(ctx context.Context, userID int64) (*dto
 	}

 	peerIDs := make([]int64, 0, len(convs))
+	groupConvIDs := make([]int64, 0)
 	for _, c := range convs {
-		if c.PeerUserID > 0 {
+		if c.Type == constants.ConversationTypePrivate && c.PeerUserID > 0 {
 			peerIDs = append(peerIDs, c.PeerUserID)
+		} else if c.Type == constants.ConversationTypeGroup {
+			groupConvIDs = append(groupConvIDs, c.ID)
 		}
 	}

 	userMap := make(map[int64]*userBrief)
 	if len(peerIDs) > 0 {
-		users, err := s.userInfoGetter.GetUsersByIDs(ctx, peerIDs)
-		if err != nil {
-			logs.Error(ctx, funcName, "批量查询用户信息失败", zap.Error(err))
+		users, uErr := s.userInfoGetter.GetUsersByIDs(ctx, peerIDs)
+		if uErr != nil {
+			logs.Error(ctx, funcName, "批量查询用户信息失败", zap.Error(uErr))
 		} else {
 			for i := range users {
 				u := users[i]
@@ -264,17 +435,31 @@ func (s *IMService) GetConversationList(ctx context.Context, userID int64) (*dto
 		}
 	}

+	groupMap := make(map[int64]*dto.GroupBrief)
+	if s.groupInfo != nil && len(groupConvIDs) > 0 {
+		for _, convID := range groupConvIDs {
+			brief, gErr := s.groupInfo.GetGroupBrief(ctx, convID)
+			if gErr != nil {
+				logs.Error(ctx, funcName, "获取群信息失败",
+					zap.Int64("conversation_id", convID), zap.Error(gErr))
+				continue
+			}
+			groupMap[convID] = brief
+		}
+	}
+
 	list := make([]dto.ConversationDTO, 0, len(convs))
 	for _, c := range convs {
-		peerID := c.PeerUserID
 		item := dto.ConversationDTO{
 			ID:              c.ID,
 			Type:            c.Type,
-			PeerUserID:      peerID,
+			PeerUserID:      c.PeerUserID,
 			LastMsgContent:  c.LastMsgContent,
 			LastMsgSenderID: c.LastMsgSenderID,
 			IsPinned:        c.IsPinned,
 			UnreadCount:     c.UnreadCount,
+			IsDoNotDisturb:  c.IsDoNotDisturb,
+			AtMeCount:       c.AtMeCount,
 		}
 		if c.ClearBeforeMsgID > 0 && c.LastMessageID != nil && *c.LastMessageID <= c.ClearBeforeMsgID {
 			item.LastMsgContent = ""
@@ -283,10 +468,20 @@ func (s *IMService) GetConversationList(ctx context.Context, userID int64) (*dto
 		if c.LastMsgTime != nil {
 			item.LastMsgTime = c.LastMsgTime.Format("2006-01-02 15:04:05")
 		}
-		if brief, ok := userMap[peerID]; ok {
+
+		if c.Type == constants.ConversationTypePrivate {
+			if brief, ok := userMap[c.PeerUserID]; ok {
 				item.PeerNickname = brief.Nickname
 				item.PeerAvatar = brief.Avatar
 			}
+		} else if c.Type == constants.ConversationTypeGroup {
+			if gBrief, ok := groupMap[c.ID]; ok {
+				item.PeerNickname = gBrief.Name
+				item.PeerAvatar = gBrief.Avatar
+				item.GroupID = gBrief.ID
+			}
+		}
+
 		list = append(list, item)
 	}

@@ -360,6 +555,133 @@ func (s *IMService) MarkRead(ctx context.Context, userID int64, conversationID i
 	return nil
 }

+// MarkGroupMessagesRead 标记群聊消息已读（消息级别）
+// 将指定消息标记为已读 + 推送已读计数变化给消息发送者
+func (s *IMService) MarkGroupMessagesRead(ctx context.Context, userID int64, req *dto.MarkGroupReadRequest) error {
+	funcName := "service.im_service.MarkGroupMessagesRead"
+	logs.Info(ctx, funcName, "群消息标记已读",
+		zap.Int64("user_id", userID), zap.Int64("conversation_id", req.ConversationID),
+		zap.Int("msg_count", len(req.MessageIDs)))
+
+	member, err := s.convDAO.GetMember(ctx, req.ConversationID, userID)
+	if err != nil || member == nil {
+		return ErrNotMember
+	}
+
+	if s.readRecorder == nil || len(req.MessageIDs) == 0 {
+		return nil
+	}
+
+	if err := s.readRecorder.BatchCreateReads(ctx, req.MessageIDs, userID); err != nil {
+		logs.Error(ctx, funcName, "批量创建已读记录失败", zap.Error(err))
+		return err
+	}
+
+	if member.AtMeCount > 0 {
+		if err := s.convDAO.ClearAtMeCount(ctx, req.ConversationID, userID); err != nil {
+			logs.Error(ctx, funcName, "清零@计数失败", zap.Error(err))
+		}
+	}
+
+	readCounts, err := s.readRecorder.GetReadCountBatch(ctx, req.MessageIDs)
+	if err != nil {
+		logs.Error(ctx, funcName, "获取已读计数失败", zap.Error(err))
+		return nil
+	}
+
+	for _, msgID := range req.MessageIDs {
+		msg, mErr := s.msgDAO.GetByID(ctx, msgID)
+		if mErr != nil || msg.SenderID == userID {
+			continue
+		}
+		count := readCounts[msgID]
+		s.pushToUser(ctx, msg.SenderID, "im.message.read.count", map[string]interface{}{
+			"message_id":      msgID,
+			"conversation_id": req.ConversationID,
+			"read_count":      count,
+		})
+	}
+
+	return nil
+}
+
+// GetMessageReadDetail 获取消息已读详情（已读/未读用户列表）
+func (s *IMService) GetMessageReadDetail(ctx context.Context, userID int64, messageID int64) (*dto.GetReadDetailResponse, error) {
+	funcName := "service.im_service.GetMessageReadDetail"
+	logs.Debug(ctx, funcName, "获取已读详情",
+		zap.Int64("user_id", userID), zap.Int64("message_id", messageID))
+
+	msg, err := s.msgDAO.GetByID(ctx, messageID)
+	if err != nil {
+		return nil, ErrMsgNotFound
+	}
+
+	member, err := s.convDAO.GetMember(ctx, msg.ConversationID, userID)
+	if err != nil || member == nil {
+		return nil, ErrNotMember
+	}
+
+	memberIDs, err := s.convDAO.GetConversationMemberIDs(ctx, msg.ConversationID)
+	if err != nil {
+		return nil, err
+	}
+
+	readUserIDs := make(map[int64]bool)
+	if s.readRecorder != nil {
+		ids, rErr := s.readRecorder.GetReadUserIDs(ctx, messageID)
+		if rErr != nil {
+			logs.Error(ctx, funcName, "获取已读用户列表失败", zap.Error(rErr))
+		} else {
+			for _, id := range ids {
+				readUserIDs[id] = true
+			}
+		}
+	}
+
+	allUserIDs := make([]int64, 0, len(memberIDs))
+	for _, id := range memberIDs {
+		if id != msg.SenderID {
+			allUserIDs = append(allUserIDs, id)
+		}
+	}
+
+	userMap := make(map[int64]*userBrief)
+	if len(allUserIDs) > 0 {
+		users, uErr := s.userInfoGetter.GetUsersByIDs(ctx, allUserIDs)
+		if uErr != nil {
+			logs.Error(ctx, funcName, "批量查询用户信息失败", zap.Error(uErr))
+		} else {
+			for i := range users {
+				u := users[i]
+				userMap[u.ID] = &userBrief{Nickname: u.Nickname, Avatar: u.Avatar}
+			}
+		}
+	}
+
+	var readList, unreadList []dto.MessageReadDetailDTO
+	for _, uid := range allUserIDs {
+		item := dto.MessageReadDetailDTO{
+			UserID: uid,
+		}
+		if brief, ok := userMap[uid]; ok {
+			item.UserNickname = brief.Nickname
+			item.UserAvatar = brief.Avatar
+		}
+		if readUserIDs[uid] {
+			readList = append(readList, item)
+		} else {
+			unreadList = append(unreadList, item)
+		}
+	}
+
+	return &dto.GetReadDetailResponse{
+		ReadList:   readList,
+		UnreadList: unreadList,
+		ReadCount:  len(readList),
+		TotalCount: len(allUserIDs),
+	}, nil
+}
+
 // PinConversation 置顶/取消置顶会话
 func (s *IMService) PinConversation(ctx context.Context, userID int64, conversationID int64, isPinned bool) error {
 	funcName := "service.im_service.PinConversation"
@@ -580,7 +902,7 @@ func (s *IMService) decrementTotalUnread(ctx context.Context, userID int64, coun

 // toMessageDTO 将 model.Message 转换为 dto.MessageDTO
 func (s *IMService) toMessageDTO(m *model.Message) *dto.MessageDTO {
-	return &dto.MessageDTO{
+	d := &dto.MessageDTO{
 		ID:             m.ID,
 		ConversationID: m.ConversationID,
 		SenderID:       m.SenderID,
@@ -590,6 +912,28 @@ func (s *IMService) toMessageDTO(m *model.Message) *dto.MessageDTO {
 		ClientMsgID:    m.ClientMsgID,
 		CreatedAt:      m.CreatedAt.Format("2006-01-02 15:04:05"),
 	}
+	if len(m.AtUserIDs) > 0 {
+		d.AtUserIDs = []int64(m.AtUserIDs)
+	}
+	return d
+}
+
+// buildMessagePushData 构建消息推送数据（单聊/群聊通用）
+func (s *IMService) buildMessagePushData(ctx context.Context, msg *model.Message, senderID int64) map[string]interface{} {
+	pushData := map[string]interface{}{
+		"id":              msg.ID,
+		"conversation_id": msg.ConversationID,
+		"sender_id":       senderID,
+		"type":            msg.Type,
+		"content":         msg.Content,
+		"client_msg_id":   msg.ClientMsgID,
+		"created_at":      msg.CreatedAt.Format("2006-01-02 15:04:05"),
+	}
+	if senderUsers, sErr := s.userInfoGetter.GetUsersByIDs(ctx, []int64{senderID}); sErr == nil && len(senderUsers) > 0 {
+		pushData["sender_name"] = senderUsers[0].Nickname
+		pushData["sender_avatar"] = senderUsers[0].Avatar
+	}
+	return pushData
 }

 // userBrief 用户简要信息（内部使用）
--- a/backend/go-service/app/im/service/interfaces.go
+++ b/backend/go-service/app/im/service/interfaces.go
@@ -5,6 +5,7 @@ import (
 	"context"

 	authModel "github.com/echochat/backend/app/auth/model"
+	"github.com/echochat/backend/app/dto"
 )

 // FriendChecker 好友关系校验接口
@@ -18,3 +19,19 @@ type FriendChecker interface {
 type UserInfoGetter interface {
 	GetUsersByIDs(ctx context.Context, userIDs []int64) ([]authModel.User, error)
 }
+
+// GroupInfoGetter 群信息查询接口（Phase 2c）
+// 由 group.GroupDAO 隐式实现，通过 Wire 接口注入
+// IM 模块通过此接口获取群表信息（判断全体禁言、已解散等）
+// 成员信息（角色/禁言/列表）通过 convDAO 直接查询 im_conversation_members 表
+type GroupInfoGetter interface {
+	GetGroupBrief(ctx context.Context, conversationID int64) (*dto.GroupBrief, error)
+}
+
+// MessageReadRecorder 群消息已读记录接口（Phase 2c）
+// 由 group.MessageReadDAO 隐式实现
+type MessageReadRecorder interface {
+	BatchCreateReads(ctx context.Context, messageIDs []int64, userID int64) error
+	GetReadCountBatch(ctx context.Context, messageIDs []int64) (map[int64]int, error)
+	GetReadUserIDs(ctx context.Context, messageID int64) ([]int64, error)
+}
--- a/backend/go-service/app/provider/provider.go
+++ b/backend/go-service/app/provider/provider.go
@@ -7,13 +7,17 @@ import (
 	authController "github.com/echochat/backend/app/auth/controller"
 	"github.com/echochat/backend/app/auth/service"
 	contactController "github.com/echochat/backend/app/contact/controller"
+	fileController "github.com/echochat/backend/app/file/controller"
+	groupController "github.com/echochat/backend/app/group/controller"
 	imController "github.com/echochat/backend/app/im/controller"
 	imHandler "github.com/echochat/backend/app/im/handler"
 	wsApp "github.com/echochat/backend/app/ws"
 	"github.com/echochat/backend/config"
 	"github.com/echochat/backend/pkg/db"
+	"github.com/echochat/backend/pkg/storage"
 	"github.com/echochat/backend/pkg/ws"
 	"github.com/google/wire"
+	"github.com/minio/minio-go/v7"
 	"github.com/redis/go-redis/v9"
 	"gorm.io/gorm"
 )
@@ -23,12 +27,14 @@ type App struct {
 	Config                *config.Config
 	DB                    *gorm.DB
 	Redis                 *redis.Client
+	MinioClient           *minio.Client                               // MinIO 对象存储客户端
 	AuthService           *service.AuthService                        // Auth 认证服务
 	AuthController        *authController.AuthController              // 前台认证控制器
 	AdminAuthController   *authController.AdminAuthController         // 后台认证控制器
 	UserManageController    *adminController.UserManageController       // 管理端用户管理控制器
 	OnlineController        *adminController.OnlineController           // 管理端在线监控控制器
 	ContactManageController *adminController.ContactManageController    // 管理端好友关系管理控制器
+	GroupManageController   *adminController.GroupManageController      // 管理端群组管理控制器
 	WSHandler             *wsApp.Handler                              // WebSocket 连接处理器
 	Hub                   *ws.Hub                                     // WebSocket Hub 连接管理
 	PubSub                *ws.PubSub                                  // Redis Pub/Sub 消息路由
@@ -37,6 +43,8 @@ type App struct {
 	IMController          *imController.IMController                 // IM 即时通讯控制器
 	IMEventHandler        *imHandler.EventHandler                    // IM WS 事件处理器
 	OfflinePusher         *imHandler.OfflinePusher                   // 离线消息推送器
+	FileController        *fileController.FileController             // 文件上传控制器
+	GroupController       *groupController.GroupController           // 群聊管理控制器
 }

 // NewApp 创建应用实例
@@ -44,12 +52,14 @@ func NewApp(
 	cfg *config.Config,
 	gormDB *gorm.DB,
 	redisClient *redis.Client,
+	minioClient *minio.Client,
 	authService *service.AuthService,
 	authCtrl *authController.AuthController,
 	adminAuthCtrl *authController.AdminAuthController,
 	userManageCtrl *adminController.UserManageController,
 	onlineCtrl *adminController.OnlineController,
 	contactManageCtrl *adminController.ContactManageController,
+	groupManageCtrl *adminController.GroupManageController,
 	wsHandler *wsApp.Handler,
 	hub *ws.Hub,
 	pubsub *ws.PubSub,
@@ -58,6 +68,8 @@ func NewApp(
 	imCtrl *imController.IMController,
 	imEventHandler *imHandler.EventHandler,
 	offlinePusher *imHandler.OfflinePusher,
+	fileCtrl *fileController.FileController,
+	groupCtrl *groupController.GroupController,
 ) *App {
 	// 注入离线消息推送器到 WS Handler
 	wsHandler.SetOfflinePusher(offlinePusher)
@@ -66,12 +78,14 @@ func NewApp(
 		Config:                  cfg,
 		DB:                      gormDB,
 		Redis:                   redisClient,
+		MinioClient:             minioClient,
 		AuthService:             authService,
 		AuthController:          authCtrl,
 		AdminAuthController:     adminAuthCtrl,
 		UserManageController:    userManageCtrl,
 		OnlineController:        onlineCtrl,
 		ContactManageController: contactManageCtrl,
+		GroupManageController:   groupManageCtrl,
 		WSHandler:               wsHandler,
 		Hub:                     hub,
 		PubSub:                  pubsub,
@@ -80,6 +94,8 @@ func NewApp(
 		IMController:            imCtrl,
 		IMEventHandler:          imEventHandler,
 		OfflinePusher:           offlinePusher,
+		FileController:          fileCtrl,
+		GroupController:         groupCtrl,
 	}
 }

@@ -98,12 +114,19 @@ func provideJWTConfig(cfg *config.Config) *config.JWTConfig {
 	return &cfg.JWT
 }

+// provideMinioConfig 从全局 Config 中提取 MinioConfig
+func provideMinioConfig(cfg *config.Config) *config.MinioConfig {
+	return &cfg.Minio
+}
+
 // InfraSet 基础设施层 Provider Set
 var InfraSet = wire.NewSet(
 	provideDBConfig,
 	provideRedisConfig,
 	provideJWTConfig,
+	provideMinioConfig,
 	db.NewPostgres,
 	db.NewRedis,
+	storage.NewMinioClient,
 	NewApp,
 )
--- a/backend/go-service/app/provider/wire.go
+++ b/backend/go-service/app/provider/wire.go
@@ -6,11 +6,16 @@ package provider
 import (
 	"github.com/echochat/backend/app/admin"
 	"github.com/echochat/backend/app/auth"
-	"github.com/echochat/backend/app/contact"
 	authService "github.com/echochat/backend/app/auth/service"
+	"github.com/echochat/backend/app/contact"
 	contactDAO "github.com/echochat/backend/app/contact/dao"
 	contactService "github.com/echochat/backend/app/contact/service"
+	fileApp "github.com/echochat/backend/app/file"
+	groupApp "github.com/echochat/backend/app/group"
+	groupDAO "github.com/echochat/backend/app/group/dao"
+	groupService "github.com/echochat/backend/app/group/service"
 	imApp "github.com/echochat/backend/app/im"
+	imDAO "github.com/echochat/backend/app/im/dao"
 	imService "github.com/echochat/backend/app/im/service"
 	wsApp "github.com/echochat/backend/app/ws"
 	"github.com/echochat/backend/config"
@@ -26,11 +31,17 @@ func InitializeApp(cfg *config.Config) (*App, error) {
 		wsApp.WSSet,
 		contact.ContactSet,
 		imApp.IMSet,
+		fileApp.FileSet,
+		groupApp.GroupSet,
 		wire.Bind(new(wsApp.FriendIDsGetter), new(*contactDAO.FriendshipDAO)),
+		wire.Bind(new(groupService.UserInfoProvider), new(*contactDAO.FriendshipDAO)),
+		wire.Bind(new(imService.GroupInfoGetter), new(*groupDAO.GroupDAO)),
+		wire.Bind(new(imService.MessageReadRecorder), new(*groupDAO.MessageReadDAO)),
 		wire.Bind(new(wsApp.TokenValidator), new(*authService.AuthService)),
 		wire.Bind(new(imService.FriendChecker), new(*contactDAO.FriendshipDAO)),
 		wire.Bind(new(imService.UserInfoGetter), new(*contactDAO.FriendshipDAO)),
 		wire.Bind(new(contactService.OnlineChecker), new(*wsApp.OnlineService)),
+		wire.Bind(new(groupService.MessageWriter), new(*imDAO.MessageDAO)),
 	)
 	return nil, nil
 }
--- a/backend/go-service/app/provider/wire_gen.go
+++ b/backend/go-service/app/provider/wire_gen.go
@@ -16,10 +16,16 @@ import (
 	controller3 "github.com/echochat/backend/app/contact/controller"
 	dao3 "github.com/echochat/backend/app/contact/dao"
 	service3 "github.com/echochat/backend/app/contact/service"
+	controller4 "github.com/echochat/backend/app/file/controller"
+	service4 "github.com/echochat/backend/app/file/service"
+	controller5 "github.com/echochat/backend/app/group/controller"
+	dao4 "github.com/echochat/backend/app/group/dao"
+	service5 "github.com/echochat/backend/app/group/service"
 	imApp "github.com/echochat/backend/app/im"
 	"github.com/echochat/backend/app/ws"
 	"github.com/echochat/backend/config"
 	"github.com/echochat/backend/pkg/db"
+	"github.com/echochat/backend/pkg/storage"
 )

 // Injectors from wire.go:
@@ -36,6 +42,11 @@ func InitializeApp(cfg *config.Config) (*App, error) {
 	if err != nil {
 		return nil, err
 	}
+	minioConfig := provideMinioConfig(cfg)
+	minioClient, err := storage.NewMinioClient(minioConfig)
+	if err != nil {
+		return nil, err
+	}
 	userDAO := dao.NewUserDAO(gormDB)
 	roleDAO := dao.NewRoleDAO(gormDB)
 	jwtConfig := provideJWTConfig(cfg)
@@ -62,11 +73,26 @@ func InitializeApp(cfg *config.Config) (*App, error) {
 	// IM 模块初始化
 	conversationDAO := imApp.ProvideConversationDAO(gormDB)
 	messageDAO := imApp.ProvideMessageDAO(gormDB)
-	imService := imApp.ProvideIMService(conversationDAO, messageDAO, pubSub, client, friendshipDAO, friendshipDAO)
+	groupDAO := dao4.NewGroupDAO(gormDB)
+	messageReadDAO := dao4.NewMessageReadDAO(gormDB)
+	imService := imApp.ProvideIMService(conversationDAO, messageDAO, pubSub, client, friendshipDAO, friendshipDAO, groupDAO, messageReadDAO)
 	imEventHandler := imApp.ProvideIMEventHandler(imService, hub)
 	offlinePusher := imApp.ProvideOfflinePusher(imService, conversationDAO, pubSub)
 	imController := imApp.ProvideIMController(imService)

-	app := NewApp(cfg, gormDB, client, authService, authController, adminAuthController, userManageController, onlineController, contactManageController, handler, hub, pubSub, onlineService, contactController, imController, imEventHandler, offlinePusher)
+	// File 模块初始化
+	fileService := service4.NewFileService(minioClient, minioConfig)
+	fileController := controller4.NewFileController(fileService)
+
+	// Group 模块初始化
+	joinRequestDAO := dao4.NewJoinRequestDAO(gormDB)
+	groupService := service5.NewGroupService(groupDAO, joinRequestDAO, friendshipDAO, pubSub, messageDAO)
+	groupController := controller5.NewGroupController(groupService)
+
+	// Admin 群组管理初始化
+	groupManageService := service2.NewGroupManageService(gormDB, groupDAO)
+	groupManageController := controller2.NewGroupManageController(groupManageService)
+
+	app := NewApp(cfg, gormDB, client, minioClient, authService, authController, adminAuthController, userManageController, onlineController, contactManageController, groupManageController, handler, hub, pubSub, onlineService, contactController, imController, imEventHandler, offlinePusher, fileController, groupController)
 	return app, nil
 }
--- a/backend/go-service/config/config.dev.yaml
+++ b/backend/go-service/config/config.dev.yaml
@@ -45,3 +45,11 @@ log:
    max_backups: 10    # 保留的旧日志归档文件最大数量，超出的自动删除
    max_age: 30        # 旧日志归档文件保留天数，超过天数的自动删除
    compress: false    # 是否对归档的旧日志文件进行 gzip 压缩（生产环境建议 true）
+
+# MinIO 对象存储配置
+minio:
+  endpoint: "localhost:9000"           # MinIO 服务地址
+  access_key: "echochat"               # 访问密钥（与 docker-compose 中的 MINIO_ROOT_USER 一致）
+  secret_key: "echochat123456"         # 密钥（与 docker-compose 中的 MINIO_ROOT_PASSWORD 一致）
+  bucket: "echochat"                   # 存储桶名称
+  use_ssl: false                       # 开发环境不使用 HTTPS
--- a/backend/go-service/config/config.docker.yaml
+++ b/backend/go-service/config/config.docker.yaml
@@ -40,3 +40,10 @@ log:
    max_backups: 10
    max_age: 30
    compress: false
+
+minio:
+  endpoint: "minio:9000"
+  access_key: "echochat"
+  secret_key: "echochat123456"
+  bucket: "echochat"
+  use_ssl: false
--- a/backend/go-service/config/config.go
+++ b/backend/go-service/config/config.go
@@ -16,6 +16,16 @@ type Config struct {
 	Redis    RedisConfig    `mapstructure:"redis"`
 	JWT      JWTConfig      `mapstructure:"jwt"`
 	Log      LogConfig      `mapstructure:"log"`
+	Minio    MinioConfig    `mapstructure:"minio"`
+}
+
+// MinioConfig MinIO 对象存储配置
+type MinioConfig struct {
+	Endpoint  string `mapstructure:"endpoint"`   // MinIO 服务地址（host:port）
+	AccessKey string `mapstructure:"access_key"` // 访问密钥
+	SecretKey string `mapstructure:"secret_key"` // 密钥
+	Bucket    string `mapstructure:"bucket"`     // 存储桶名称
+	UseSSL    bool   `mapstructure:"use_ssl"`    // 是否使用 HTTPS
 }

 // ServerConfig HTTP 服务配置
--- a/backend/go-service/go.mod
+++ b/backend/go-service/go.mod
@@ -8,6 +8,7 @@ require (
 	github.com/google/uuid v1.6.0
 	github.com/google/wire v0.7.0
 	github.com/gorilla/websocket v1.5.3
+	github.com/minio/minio-go/v7 v7.0.83
 	github.com/redis/go-redis/v9 v9.18.0
 	github.com/spf13/viper v1.21.0
 	go.uber.org/zap v1.27.1
@@ -23,14 +24,16 @@ require (
 	github.com/cespare/xxhash/v2 v2.3.0 // indirect
 	github.com/cloudwego/base64x v0.1.6 // indirect
 	github.com/dgryski/go-rendezvous v0.0.0-20200823014737-9f7001d12a5f // indirect
+	github.com/dustin/go-humanize v1.0.1 // indirect
 	github.com/fsnotify/fsnotify v1.9.0 // indirect
 	github.com/gabriel-vasile/mimetype v1.4.8 // indirect
 	github.com/gin-contrib/sse v1.1.0 // indirect
+	github.com/go-ini/ini v1.67.0 // indirect
 	github.com/go-playground/locales v0.14.1 // indirect
 	github.com/go-playground/universal-translator v0.18.1 // indirect
 	github.com/go-playground/validator/v10 v10.27.0 // indirect
 	github.com/go-viper/mapstructure/v2 v2.4.0 // indirect
-	github.com/goccy/go-json v0.10.2 // indirect
+	github.com/goccy/go-json v0.10.4 // indirect
 	github.com/goccy/go-yaml v1.18.0 // indirect
 	github.com/jackc/pgpassfile v1.0.0 // indirect
 	github.com/jackc/pgservicefile v0.0.0-20240606120523-5a60cdf6a761 // indirect
@@ -39,14 +42,17 @@ require (
 	github.com/jinzhu/inflection v1.0.0 // indirect
 	github.com/jinzhu/now v1.1.5 // indirect
 	github.com/json-iterator/go v1.1.12 // indirect
+	github.com/klauspost/compress v1.17.11 // indirect
 	github.com/klauspost/cpuid/v2 v2.3.0 // indirect
 	github.com/leodido/go-urn v1.4.0 // indirect
 	github.com/mattn/go-isatty v0.0.20 // indirect
+	github.com/minio/md5-simd v1.1.2 // indirect
 	github.com/modern-go/concurrent v0.0.0-20180228061459-e0a39a4cb421 // indirect
 	github.com/modern-go/reflect2 v1.0.2 // indirect
 	github.com/pelletier/go-toml/v2 v2.2.4 // indirect
 	github.com/quic-go/qpack v0.5.1 // indirect
 	github.com/quic-go/quic-go v0.54.0 // indirect
+	github.com/rs/xid v1.6.0 // indirect
 	github.com/sagikazarmark/locafero v0.11.0 // indirect
 	github.com/sourcegraph/conc v0.3.1-0.20240121214520-5f936abd7ae8 // indirect
 	github.com/spf13/afero v1.15.0 // indirect
--- a/backend/go-service/go.sum
+++ b/backend/go-service/go.sum
@@ -15,6 +15,8 @@ github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c
 github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/dgryski/go-rendezvous v0.0.0-20200823014737-9f7001d12a5f h1:lO4WD4F/rVNCu3HqELle0jiPLLBs70cWOduZpkS1E78=
 github.com/dgryski/go-rendezvous v0.0.0-20200823014737-9f7001d12a5f/go.mod h1:cuUVRXasLTGF7a8hSLbxyZXjz+1KgoB3wDUb6vlszIc=
+github.com/dustin/go-humanize v1.0.1 h1:GzkhY7T5VNhEkwH0PVJgjz+fX1rhBrR7pRT3mDkpeCY=
+github.com/dustin/go-humanize v1.0.1/go.mod h1:Mu1zIs6XwVuF/gI1OepvI0qD18qycQx+mFykh5fBlto=
 github.com/frankban/quicktest v1.14.6 h1:7Xjx+VpznH+oBnejlPUj8oUpdxnVs4f8XU8WnHkI4W8=
 github.com/frankban/quicktest v1.14.6/go.mod h1:4ptaffx2x8+WTWXmUCuVU6aPUX1/Mz7zb5vbUoiM6w0=
 github.com/fsnotify/fsnotify v1.9.0 h1:2Ml+OJNzbYCTzsxtv8vKSFD9PbJjmhYF14k/jKC7S9k=
@@ -25,6 +27,8 @@ github.com/gin-contrib/sse v1.1.0 h1:n0w2GMuUpWDVp7qSpvze6fAu9iRxJY4Hmj6AmBOU05w
 github.com/gin-contrib/sse v1.1.0/go.mod h1:hxRZ5gVpWMT7Z0B0gSNYqqsSCNIJMjzvm6fqCz9vjwM=
 github.com/gin-gonic/gin v1.11.0 h1:OW/6PLjyusp2PPXtyxKHU0RbX6I/l28FTdDlae5ueWk=
 github.com/gin-gonic/gin v1.11.0/go.mod h1:+iq/FyxlGzII0KHiBGjuNn4UNENUlKbGlNmc+W50Dls=
+github.com/go-ini/ini v1.67.0 h1:z6ZrTEZqSWOTyH2FlglNbNgARyHG8oLW9gMELqKr06A=
+github.com/go-ini/ini v1.67.0/go.mod h1:ByCAeIL28uOIIG0E3PJtZPDL8WnHpFKFOtgjp+3Ies8=
 github.com/go-playground/assert/v2 v2.2.0 h1:JvknZsQTYeFEAhQwI4qEt9cyV5ONwRHC+lYKSsYSR8s=
 github.com/go-playground/assert/v2 v2.2.0/go.mod h1:VDjEfimB/XKnb+ZQfWdccd7VUvScMdVu0Titje2rxJ4=
 github.com/go-playground/locales v0.14.1 h1:EWaQ/wswjilfKLTECiXz7Rh+3BjFhfDFKv/oXslEjJA=
@@ -35,8 +39,8 @@ github.com/go-playground/validator/v10 v10.27.0 h1:w8+XrWVMhGkxOaaowyKH35gFydVHO
 github.com/go-playground/validator/v10 v10.27.0/go.mod h1:I5QpIEbmr8On7W0TktmJAumgzX4CA1XNl4ZmDuVHKKo=
 github.com/go-viper/mapstructure/v2 v2.4.0 h1:EBsztssimR/CONLSZZ04E8qAkxNYq4Qp9LvH92wZUgs=
 github.com/go-viper/mapstructure/v2 v2.4.0/go.mod h1:oJDH3BJKyqBA2TXFhDsKDGDTlndYOZ6rGS0BRZIxGhM=
-github.com/goccy/go-json v0.10.2 h1:CrxCmQqYDkv1z7lO7Wbh2HN93uovUHgrECaO5ZrCXAU=
-github.com/goccy/go-json v0.10.2/go.mod h1:6MelG93GURQebXPDq3khkgXZkazVtN9CRI+MGFi0w8I=
+github.com/goccy/go-json v0.10.4 h1:JSwxQzIqKfmFX1swYPpUThQZp/Ka4wzJdK0LWVytLPM=
+github.com/goccy/go-json v0.10.4/go.mod h1:oq7eo15ShAhp70Anwd5lgX2pLfOS3QCiwU/PULtXL6M=
 github.com/goccy/go-yaml v1.18.0 h1:8W7wMFS12Pcas7KU+VVkaiCng+kG8QiFeFwzFb+rwuw=
 github.com/goccy/go-yaml v1.18.0/go.mod h1:XBurs7gK8ATbW4ZPGKgcbrY1Br56PdM69F7LkFRi1kA=
 github.com/golang-jwt/jwt/v5 v5.2.1 h1:OuVbFODueb089Lh128TAcimifWaLhJwVflnrgM17wHk=
@@ -64,6 +68,9 @@ github.com/jinzhu/now v1.1.5 h1:/o9tlHleP7gOFmsnYNz3RGnqzefHA47wQpKrrdTIwXQ=
 github.com/jinzhu/now v1.1.5/go.mod h1:d3SSVoowX0Lcu0IBviAWJpolVfI5UJVZZ7cO71lE/z8=
 github.com/json-iterator/go v1.1.12 h1:PV8peI4a0ysnczrg+LtxykD8LfKY9ML6u2jnxaEnrnM=
 github.com/json-iterator/go v1.1.12/go.mod h1:e30LSqwooZae/UwlEbR2852Gd8hjQvJoHmT4TnhNGBo=
+github.com/klauspost/compress v1.17.11 h1:In6xLpyWOi1+C7tXUUWv2ot1QvBjxevKAaI6IXrJmUc=
+github.com/klauspost/compress v1.17.11/go.mod h1:pMDklpSncoRMuLFrf1W9Ss9KT+0rH90U12bZKk7uwG0=
+github.com/klauspost/cpuid/v2 v2.0.1/go.mod h1:FInQzS24/EEf25PyTYn52gqo7WaD8xa0213Md/qVLRg=
 github.com/klauspost/cpuid/v2 v2.3.0 h1:S4CRMLnYUhGeDFDqkGriYKdfoFlDnMtqTiI/sFzhA9Y=
 github.com/klauspost/cpuid/v2 v2.3.0/go.mod h1:hqwkgyIinND0mEev00jJYCxPNVRVXFQeu1XKlok6oO0=
 github.com/kr/pretty v0.3.1 h1:flRD4NNwYAUpkphVc1HcthR4KEIFJ65n8Mw5qdRn3LE=
@@ -74,6 +81,10 @@ github.com/leodido/go-urn v1.4.0 h1:WT9HwE9SGECu3lg4d/dIA+jxlljEa1/ffXKmRjqdmIQ=
 github.com/leodido/go-urn v1.4.0/go.mod h1:bvxc+MVxLKB4z00jd1z+Dvzr47oO32F/QSNjSBOlFxI=
 github.com/mattn/go-isatty v0.0.20 h1:xfD0iDuEKnDkl03q4limB+vH+GxLEtL/jb4xVJSWWEY=
 github.com/mattn/go-isatty v0.0.20/go.mod h1:W+V8PltTTMOvKvAeJH7IuucS94S2C6jfK/D7dTCTo3Y=
+github.com/minio/md5-simd v1.1.2 h1:Gdi1DZK69+ZVMoNHRXJyNcxrMA4dSxoYHZSQbirFg34=
+github.com/minio/md5-simd v1.1.2/go.mod h1:MzdKDxYpY2BT9XQFocsiZf/NKVtR7nkE4RoEpN+20RM=
+github.com/minio/minio-go/v7 v7.0.83 h1:W4Kokksvlz3OKf3OqIlzDNKd4MERlC2oN8YptwJ0+GA=
+github.com/minio/minio-go/v7 v7.0.83/go.mod h1:57YXpvc5l3rjPdhqNrDsvVlY0qPI6UTk1bflAe+9doY=
 github.com/modern-go/concurrent v0.0.0-20180228061459-e0a39a4cb421 h1:ZqeYNhU3OHLH3mGKHDcjJRFFRrJa6eAM5H+CtDdOsPc=
 github.com/modern-go/concurrent v0.0.0-20180228061459-e0a39a4cb421/go.mod h1:6dJC0mAP4ikYIbvyc7fijjWJddQyLn8Ig3JB5CqoB9Q=
 github.com/modern-go/reflect2 v1.0.2 h1:xBagoLtFs94CBntxluKeaWgTMpvLxC4ur3nMaC9Gz0M=
@@ -90,6 +101,8 @@ github.com/redis/go-redis/v9 v9.18.0 h1:pMkxYPkEbMPwRdenAzUNyFNrDgHx9U+DrBabWNfS
 github.com/redis/go-redis/v9 v9.18.0/go.mod h1:k3ufPphLU5YXwNTUcCRXGxUoF1fqxnhFQmscfkCoDA0=
 github.com/rogpeppe/go-internal v1.9.0 h1:73kH8U+JUqXU8lRuOHeVHaa/SZPifC7BkcraZVejAe8=
 github.com/rogpeppe/go-internal v1.9.0/go.mod h1:WtVeX8xhTBvf0smdhujwtBcq4Qrzq/fJaraNFVN+nFs=
+github.com/rs/xid v1.6.0 h1:fV591PaemRlL6JfRxGDEPl69wICngIQ3shQtzfy2gxU=
+github.com/rs/xid v1.6.0/go.mod h1:7XoLgs4eV+QndskICGsho+ADou8ySMSjJKDIan90Nz0=
 github.com/sagikazarmark/locafero v0.11.0 h1:1iurJgmM9G3PA/I+wWYIOw/5SyBtxapeHDcg+AAIFXc=
 github.com/sagikazarmark/locafero v0.11.0/go.mod h1:nVIGvgyzw595SUSUE6tvCp3YYTeHs15MvlmU87WwIik=
 github.com/sourcegraph/conc v0.3.1-0.20240121214520-5f936abd7ae8 h1:+jumHNA0Wrelhe64i8F6HNlS8pkoyMv5sreGx2Ry5Rw=
--- a/backend/go-service/pkg/storage/minio.go
+++ b/backend/go-service/pkg/storage/minio.go
@@ -0,0 +1,38 @@
+// Package storage 提供对象存储基础设施
+// 封装 MinIO 客户端初始化和存储桶自动创建逻辑
+package storage
+
+import (
+	"context"
+	"fmt"
+
+	"github.com/echochat/backend/config"
+	"github.com/minio/minio-go/v7"
+	"github.com/minio/minio-go/v7/pkg/credentials"
+)
+
+// NewMinioClient 初始化 MinIO 客户端并确保存储桶存在
+// 启动时自动创建配置中指定的 bucket（如不存在）
+func NewMinioClient(cfg *config.MinioConfig) (*minio.Client, error) {
+	client, err := minio.New(cfg.Endpoint, &minio.Options{
+		Creds:  credentials.NewStaticV4(cfg.AccessKey, cfg.SecretKey, ""),
+		Secure: cfg.UseSSL,
+	})
+	if err != nil {
+		return nil, fmt.Errorf("创建 MinIO 客户端失败: %w", err)
+	}
+
+	ctx := context.Background()
+	exists, err := client.BucketExists(ctx, cfg.Bucket)
+	if err != nil {
+		return nil, fmt.Errorf("检查存储桶 %s 失败: %w", cfg.Bucket, err)
+	}
+
+	if !exists {
+		if err := client.MakeBucket(ctx, cfg.Bucket, minio.MakeBucketOptions{}); err != nil {
+			return nil, fmt.Errorf("创建存储桶 %s 失败: %w", cfg.Bucket, err)
+		}
+	}
+
+	return client, nil
+}
--- a/backend/go-service/pkg/utils/int64_array.go
+++ b/backend/go-service/pkg/utils/int64_array.go
@@ -0,0 +1,70 @@
+// Package utils 提供通用工具类型和函数
+package utils
+
+import (
+	"database/sql/driver"
+	"fmt"
+	"strconv"
+	"strings"
+)
+
+// Int64Array 自定义 PostgreSQL BIGINT[] 类型
+// 实现 sql.Scanner 和 driver.Valuer 接口，用于 GORM 与 PostgreSQL 数组字段交互
+type Int64Array []int64
+
+// Scan 从数据库读取 PostgreSQL BIGINT[] 格式：{1,2,3}
+func (a *Int64Array) Scan(src interface{}) error {
+	if src == nil {
+		*a = nil
+		return nil
+	}
+
+	var s string
+	switch v := src.(type) {
+	case []byte:
+		s = string(v)
+	case string:
+		s = v
+	default:
+		return fmt.Errorf("Int64Array.Scan: 不支持的类型 %T", src)
+	}
+
+	s = strings.TrimSpace(s)
+	if s == "{}" || s == "" {
+		*a = Int64Array{}
+		return nil
+	}
+
+	s = strings.Trim(s, "{}")
+	parts := strings.Split(s, ",")
+	result := make(Int64Array, 0, len(parts))
+	for _, p := range parts {
+		p = strings.TrimSpace(p)
+		if p == "" {
+			continue
+		}
+		n, err := strconv.ParseInt(p, 10, 64)
+		if err != nil {
+			return fmt.Errorf("Int64Array.Scan: 解析 '%s' 失败: %w", p, err)
+		}
+		result = append(result, n)
+	}
+	*a = result
+	return nil
+}
+
+// Value 写入数据库时转换为 PostgreSQL BIGINT[] 格式：{1,2,3}
+func (a Int64Array) Value() (driver.Value, error) {
+	if a == nil {
+		return nil, nil
+	}
+	if len(a) == 0 {
+		return "{}", nil
+	}
+
+	parts := make([]string, len(a))
+	for i, v := range a {
+		parts[i] = strconv.FormatInt(v, 10)
+	}
+	return "{" + strings.Join(parts, ",") + "}", nil
+}
--- a/backend/go-service/router/router.go
+++ b/backend/go-service/router/router.go
@@ -9,6 +9,8 @@ import (
 	"github.com/echochat/backend/app/admin"
 	"github.com/echochat/backend/app/auth"
 	"github.com/echochat/backend/app/contact"
+	fileApp "github.com/echochat/backend/app/file"
+	groupApp "github.com/echochat/backend/app/group"
 	imApp "github.com/echochat/backend/app/im"
 	"github.com/echochat/backend/app/provider"
 	wsApp "github.com/echochat/backend/app/ws"
@@ -34,10 +36,12 @@ func Setup(engine *gin.Engine, app *provider.App) {

 	// --- 各模块路由注册 ---
 	auth.RegisterRoutes(engine, app.AuthController, app.AdminAuthController, jwtAuth)
-	admin.RegisterRoutes(engine, app.UserManageController, app.OnlineController, app.ContactManageController, jwtAuth)
+	admin.RegisterRoutes(engine, app.UserManageController, app.OnlineController, app.ContactManageController, app.GroupManageController, jwtAuth)
 	wsApp.RegisterRoutes(engine, app.WSHandler)
 	contact.RegisterRoutes(engine, app.ContactController, jwtAuth)
 	imApp.RegisterRoutes(engine, app.IMController, jwtAuth)
+	fileApp.RegisterRoutes(engine, app.FileController, jwtAuth)
+	groupApp.RegisterRoutes(engine, app.GroupController, jwtAuth)

 	// [未来] meeting.RegisterRoutes(engine, app.MeetingController, jwtAuth)
 	// [未来] notify.RegisterRoutes(engine, app.NotifyController, jwtAuth)
--- a/deploy/docker-compose.dev.yml
+++ b/deploy/docker-compose.dev.yml
@@ -32,6 +32,25 @@ services:
      timeout: 5s
      retries: 5

+  minio:
+    image: minio/minio:latest
+    container_name: echochat-minio
+    command: server /data --console-address ":9001"
+    ports:
+      - "9000:9000"
+      - "9001:9001"
+    environment:
+      MINIO_ROOT_USER: echochat
+      MINIO_ROOT_PASSWORD: echochat123456
+    volumes:
+      - minio_data:/data
+    healthcheck:
+      test: ["CMD", "curl", "-f", "http://localhost:9000/minio/health/live"]
+      interval: 10s
+      timeout: 5s
+      retries: 5
+    restart: unless-stopped
+
  go-service:
    build:
      context: ../backend/go-service
@@ -46,8 +65,11 @@ services:
        condition: service_healthy
      redis:
        condition: service_healthy
+      minio:
+        condition: service_healthy
    restart: unless-stopped

 volumes:
  pgdata:
  redisdata:
+  minio_data:
--- a/deploy/docker/postgres/init.sql
+++ b/deploy/docker/postgres/init.sql
@@ -1,6 +1,6 @@
 -- ============================================================
 -- EchoChat 数据库初始化脚本
-- 包含模块：auth（用户认证）、contact（联系人）、im（即时通讯）
+-- 包含模块：auth（用户认证）、contact（联系人）、im（即时通讯）、group（群聊）
 -- ============================================================

 -- ============================================================
@@ -188,6 +188,12 @@ CREATE TABLE im_conversation_members (
    unread_count     INT          DEFAULT 0,
    last_read_msg_id     BIGINT       DEFAULT 0,
    clear_before_msg_id  BIGINT       DEFAULT 0,
+    role                 SMALLINT     NOT NULL DEFAULT 0,
+    nickname             VARCHAR(50)  DEFAULT '',
+    is_muted             BOOLEAN      NOT NULL DEFAULT FALSE,
+    is_do_not_disturb    BOOLEAN      NOT NULL DEFAULT FALSE,
+    joined_at            TIMESTAMP(0) DEFAULT NULL,
+    at_me_count          INT          DEFAULT 0,
    created_at           TIMESTAMP(0) NOT NULL DEFAULT NOW(),
    updated_at           TIMESTAMP(0) NOT NULL DEFAULT NOW(),
    UNIQUE (conversation_id, user_id)
@@ -202,6 +208,12 @@ COMMENT ON COLUMN im_conversation_members.is_deleted             IS '是否删
 COMMENT ON COLUMN im_conversation_members.unread_count           IS '该成员在此会话中的未读消息数';
 COMMENT ON COLUMN im_conversation_members.last_read_msg_id       IS '该成员最后已读消息 ID';
 COMMENT ON COLUMN im_conversation_members.clear_before_msg_id    IS '清空聊天记录时的消息截止 ID（个人视图，不影响对方）';
+COMMENT ON COLUMN im_conversation_members.role                   IS '成员角色：0=普通成员，1=管理员，2=群主';
+COMMENT ON COLUMN im_conversation_members.nickname               IS '群内昵称（仅群聊有效）';
+COMMENT ON COLUMN im_conversation_members.is_muted               IS '是否被禁言';
+COMMENT ON COLUMN im_conversation_members.is_do_not_disturb      IS '是否消息免打扰（仍计未读但灰色显示，不推送通知）';
+COMMENT ON COLUMN im_conversation_members.joined_at              IS '加入群聊时间';
+COMMENT ON COLUMN im_conversation_members.at_me_count            IS '被@提醒未读计数，打开会话后清零';
 COMMENT ON COLUMN im_conversation_members.created_at             IS '加入会话时间';
 COMMENT ON COLUMN im_conversation_members.updated_at             IS '最后更新时间';

@@ -222,6 +234,7 @@ CREATE TABLE im_messages (
    extra           JSONB        DEFAULT NULL,
    status          SMALLINT     NOT NULL DEFAULT 1,
    client_msg_id   VARCHAR(64)  DEFAULT '',
+    at_user_ids     BIGINT[]     DEFAULT NULL,
    created_at      TIMESTAMP(0) NOT NULL DEFAULT NOW()
 );

@@ -234,8 +247,87 @@ COMMENT ON COLUMN im_messages.content           IS '消息内容（文本消息
 COMMENT ON COLUMN im_messages.extra             IS '扩展数据（JSON 格式），预留图片尺寸、语音时长等元信息';
 COMMENT ON COLUMN im_messages.status            IS '消息状态：1=正常，2=已撤回，3=已删除';
 COMMENT ON COLUMN im_messages.client_msg_id     IS '客户端消息唯一 ID，用于幂等去重防止网络重试重复发送';
+COMMENT ON COLUMN im_messages.at_user_ids       IS '@提醒用户 ID 列表，NULL=无@，包含 0 表示 @所有人';
 COMMENT ON COLUMN im_messages.created_at        IS '消息发送时间';

 CREATE INDEX idx_im_messages_conv_time ON im_messages (conversation_id, created_at DESC);
 CREATE INDEX idx_im_messages_conv_id ON im_messages (conversation_id, id DESC);
 CREATE INDEX idx_im_messages_content_search ON im_messages USING gin(to_tsvector('simple', content));
+
+-- ============================================================
+-- im_groups: 群聊信息表
+-- 与 im_conversations (type=2) 一对一关联，存储群聊独有属性
+-- ============================================================
+CREATE TABLE im_groups (
+    id              BIGSERIAL PRIMARY KEY,
+    conversation_id BIGINT NOT NULL UNIQUE REFERENCES im_conversations(id),
+    name            VARCHAR(100) NOT NULL DEFAULT '',
+    avatar          VARCHAR(500) DEFAULT '',
+    owner_id        BIGINT NOT NULL,
+    notice          TEXT DEFAULT '',
+    max_members     INT NOT NULL DEFAULT 200,
+    is_searchable   BOOLEAN NOT NULL DEFAULT TRUE,
+    is_all_muted    BOOLEAN NOT NULL DEFAULT FALSE,
+    status          SMALLINT NOT NULL DEFAULT 1,
+    created_at      TIMESTAMP(0) NOT NULL DEFAULT NOW(),
+    updated_at      TIMESTAMP(0) NOT NULL DEFAULT NOW()
+);
+
+COMMENT ON TABLE  im_groups                 IS '群聊信息表';
+COMMENT ON COLUMN im_groups.id              IS '群唯一标识';
+COMMENT ON COLUMN im_groups.conversation_id IS '关联 im_conversations.id';
+COMMENT ON COLUMN im_groups.name            IS '群名称';
+COMMENT ON COLUMN im_groups.avatar          IS '群头像 URL（MinIO）';
+COMMENT ON COLUMN im_groups.owner_id        IS '群主用户 ID';
+COMMENT ON COLUMN im_groups.notice          IS '群公告内容';
+COMMENT ON COLUMN im_groups.max_members     IS '最大成员数，默认 200';
+COMMENT ON COLUMN im_groups.is_searchable   IS '是否可被搜索发现';
+COMMENT ON COLUMN im_groups.is_all_muted    IS '是否全体禁言';
+COMMENT ON COLUMN im_groups.status          IS '群状态：1=正常，2=已解散';
+
+CREATE INDEX idx_im_groups_owner ON im_groups(owner_id);
+CREATE INDEX idx_im_groups_name ON im_groups USING gin(to_tsvector('simple', name));
+
+-- ============================================================
+-- im_group_join_requests: 入群申请表
+-- 记录用户主动申请加入群聊的审批流程
+-- ============================================================
+CREATE TABLE im_group_join_requests (
+    id          BIGSERIAL PRIMARY KEY,
+    group_id    BIGINT NOT NULL REFERENCES im_groups(id),
+    user_id     BIGINT NOT NULL,
+    message     TEXT DEFAULT '',
+    reviewer_id BIGINT DEFAULT NULL,
+    status      SMALLINT NOT NULL DEFAULT 0,
+    created_at  TIMESTAMP(0) NOT NULL DEFAULT NOW(),
+    updated_at  TIMESTAMP(0) NOT NULL DEFAULT NOW()
+);
+
+COMMENT ON TABLE  im_group_join_requests              IS '入群申请表';
+COMMENT ON COLUMN im_group_join_requests.id            IS '申请唯一标识';
+COMMENT ON COLUMN im_group_join_requests.group_id      IS '目标群 ID';
+COMMENT ON COLUMN im_group_join_requests.user_id       IS '申请人用户 ID';
+COMMENT ON COLUMN im_group_join_requests.message       IS '申请附言';
+COMMENT ON COLUMN im_group_join_requests.reviewer_id   IS '审批人用户 ID';
+COMMENT ON COLUMN im_group_join_requests.status        IS '状态：0=待审批，1=通过，2=拒绝';
+
+CREATE INDEX idx_group_join_req_group ON im_group_join_requests(group_id, status);
+CREATE INDEX idx_group_join_req_user ON im_group_join_requests(user_id);
+
+-- ============================================================
+-- im_message_reads: 群聊消息已读记录表（消息级别）
+-- 复合主键 (message_id, user_id)，存储每条群消息的已读用户
+-- ============================================================
+CREATE TABLE im_message_reads (
+    message_id BIGINT NOT NULL,
+    user_id    BIGINT NOT NULL,
+    read_at    TIMESTAMP(0) NOT NULL DEFAULT NOW(),
+    PRIMARY KEY (message_id, user_id)
+);
+
+COMMENT ON TABLE  im_message_reads            IS '群聊消息已读记录表（消息级别）';
+COMMENT ON COLUMN im_message_reads.message_id IS '消息 ID';
+COMMENT ON COLUMN im_message_reads.user_id    IS '已读用户 ID';
+COMMENT ON COLUMN im_message_reads.read_at    IS '已读时间';
+
+CREATE INDEX idx_msg_reads_user ON im_message_reads(user_id, read_at);
--- a/deploy/docker/postgres/phase2c_migration.sql
+++ b/deploy/docker/postgres/phase2c_migration.sql
@@ -0,0 +1,109 @@
+-- ============================================================
+-- Phase 2c 数据库迁移：群聊 + 已读回执
+-- 执行环境：在已有 Phase 2b 数据库结构基础上增量升级
+-- ============================================================
+
+-- ============================================================
+-- im_groups: 群聊信息表
+-- 与 im_conversations (type=2) 一对一关联，存储群聊独有属性
+-- ============================================================
+CREATE TABLE IF NOT EXISTS im_groups (
+    id              BIGSERIAL PRIMARY KEY,
+    conversation_id BIGINT NOT NULL UNIQUE REFERENCES im_conversations(id),
+    name            VARCHAR(100) NOT NULL DEFAULT '',
+    avatar          VARCHAR(500) DEFAULT '',
+    owner_id        BIGINT NOT NULL,
+    notice          TEXT DEFAULT '',
+    max_members     INT NOT NULL DEFAULT 200,
+    is_searchable   BOOLEAN NOT NULL DEFAULT TRUE,
+    is_all_muted    BOOLEAN NOT NULL DEFAULT FALSE,
+    status          SMALLINT NOT NULL DEFAULT 1,
+    created_at      TIMESTAMP(0) NOT NULL DEFAULT NOW(),
+    updated_at      TIMESTAMP(0) NOT NULL DEFAULT NOW()
+);
+
+COMMENT ON TABLE  im_groups                 IS '群聊信息表';
+COMMENT ON COLUMN im_groups.id              IS '群唯一标识';
+COMMENT ON COLUMN im_groups.conversation_id IS '关联 im_conversations.id';
+COMMENT ON COLUMN im_groups.name            IS '群名称';
+COMMENT ON COLUMN im_groups.avatar          IS '群头像 URL（MinIO）';
+COMMENT ON COLUMN im_groups.owner_id        IS '群主用户 ID';
+COMMENT ON COLUMN im_groups.notice          IS '群公告内容';
+COMMENT ON COLUMN im_groups.max_members     IS '最大成员数，默认 200';
+COMMENT ON COLUMN im_groups.is_searchable   IS '是否可被搜索发现';
+COMMENT ON COLUMN im_groups.is_all_muted    IS '是否全体禁言';
+COMMENT ON COLUMN im_groups.status          IS '群状态：1=正常，2=已解散';
+
+CREATE INDEX IF NOT EXISTS idx_im_groups_owner ON im_groups(owner_id);
+CREATE INDEX IF NOT EXISTS idx_im_groups_name ON im_groups USING gin(to_tsvector('simple', name));
+
+-- ============================================================
+-- im_group_join_requests: 入群申请表
+-- 记录用户主动申请加入群聊的审批流程
+-- ============================================================
+CREATE TABLE IF NOT EXISTS im_group_join_requests (
+    id          BIGSERIAL PRIMARY KEY,
+    group_id    BIGINT NOT NULL REFERENCES im_groups(id),
+    user_id     BIGINT NOT NULL,
+    message     TEXT DEFAULT '',
+    reviewer_id BIGINT DEFAULT NULL,
+    status      SMALLINT NOT NULL DEFAULT 0,
+    created_at  TIMESTAMP(0) NOT NULL DEFAULT NOW(),
+    updated_at  TIMESTAMP(0) NOT NULL DEFAULT NOW()
+);
+
+COMMENT ON TABLE  im_group_join_requests              IS '入群申请表';
+COMMENT ON COLUMN im_group_join_requests.id            IS '申请唯一标识';
+COMMENT ON COLUMN im_group_join_requests.group_id      IS '目标群 ID';
+COMMENT ON COLUMN im_group_join_requests.user_id       IS '申请人用户 ID';
+COMMENT ON COLUMN im_group_join_requests.message       IS '申请附言';
+COMMENT ON COLUMN im_group_join_requests.reviewer_id   IS '审批人用户 ID';
+COMMENT ON COLUMN im_group_join_requests.status        IS '状态：0=待审批，1=通过，2=拒绝';
+
+CREATE INDEX IF NOT EXISTS idx_group_join_req_group ON im_group_join_requests(group_id, status);
+CREATE INDEX IF NOT EXISTS idx_group_join_req_user ON im_group_join_requests(user_id);
+
+-- ============================================================
+-- im_message_reads: 群聊消息已读记录表（消息级别）
+-- 复合主键 (message_id, user_id)，存储每条群消息的已读用户
+-- ============================================================
+CREATE TABLE IF NOT EXISTS im_message_reads (
+    message_id BIGINT NOT NULL,
+    user_id    BIGINT NOT NULL,
+    read_at    TIMESTAMP(0) NOT NULL DEFAULT NOW(),
+    PRIMARY KEY (message_id, user_id)
+);
+
+COMMENT ON TABLE  im_message_reads            IS '群聊消息已读记录表（消息级别）';
+COMMENT ON COLUMN im_message_reads.message_id IS '消息 ID';
+COMMENT ON COLUMN im_message_reads.user_id    IS '已读用户 ID';
+COMMENT ON COLUMN im_message_reads.read_at    IS '已读时间';
+
+CREATE INDEX IF NOT EXISTS idx_msg_reads_user ON im_message_reads(user_id, read_at);
+
+-- ============================================================
+-- im_conversation_members: 新增群聊相关字段
+-- role/nickname/is_muted/is_do_not_disturb/joined_at/at_me_count
+-- ============================================================
+ALTER TABLE im_conversation_members
+    ADD COLUMN IF NOT EXISTS role              SMALLINT NOT NULL DEFAULT 0,
+    ADD COLUMN IF NOT EXISTS nickname          VARCHAR(50) DEFAULT '',
+    ADD COLUMN IF NOT EXISTS is_muted          BOOLEAN NOT NULL DEFAULT FALSE,
+    ADD COLUMN IF NOT EXISTS is_do_not_disturb BOOLEAN NOT NULL DEFAULT FALSE,
+    ADD COLUMN IF NOT EXISTS joined_at         TIMESTAMP(0) DEFAULT NULL,
+    ADD COLUMN IF NOT EXISTS at_me_count       INT DEFAULT 0;
+
+COMMENT ON COLUMN im_conversation_members.role              IS '成员角色：0=普通成员，1=管理员，2=群主';
+COMMENT ON COLUMN im_conversation_members.nickname          IS '群内昵称（仅群聊有效）';
+COMMENT ON COLUMN im_conversation_members.is_muted          IS '是否被禁言';
+COMMENT ON COLUMN im_conversation_members.is_do_not_disturb IS '是否消息免打扰（仍计未读但灰色显示，不推送通知）';
+COMMENT ON COLUMN im_conversation_members.joined_at         IS '加入群聊时间';
+COMMENT ON COLUMN im_conversation_members.at_me_count       IS '被@提醒未读计数，打开会话后清零';
+
+-- ============================================================
+-- im_messages: 新增 @提醒用户列表字段
+-- ============================================================
+ALTER TABLE im_messages
+    ADD COLUMN IF NOT EXISTS at_user_ids BIGINT[] DEFAULT NULL;
+
+COMMENT ON COLUMN im_messages.at_user_ids IS '@提醒用户 ID 列表，NULL=无@，包含 0 表示 @所有人';
--- a/docs/api/README.md
+++ b/docs/api/README.md
@@ -16,7 +16,7 @@
 | [frontend/contact.md](frontend/contact.md) | 联系人 | ✅ Phase 2a | 17 个 API：好友申请/管理、好友分组、黑名单、搜索/推荐、在线状态 |
 | [frontend/websocket.md](frontend/websocket.md) | WebSocket | ✅ Phase 2a | 前端 WebSocket 连接管理、事件协议、心跳、重连 |
 | [frontend/im.md](frontend/im.md) | 即时通讯 | ✅ Phase 2b | 7 个 API：会话列表/置顶/删除/清空、历史消息、全局搜索、未读数 |
-| [frontend/group.md](frontend/group.md) | 群聊管理 | 🔜 Phase 2c | 16 个 API：建群/管理/成员/角色/禁言/公告/搜索/入群审批 |
+| [frontend/group.md](frontend/group.md) | 群聊管理 | ✅ Phase 2c | 16 个 API：建群/管理/成员/角色/禁言/公告/搜索/入群审批 |
 | [frontend/meeting.md](frontend/meeting.md) | 会议 | 📋 后续 | 即时会议、预约会议、加入/离开、会议列表 |
 | [frontend/notify.md](frontend/notify.md) | 通知 | 📋 后续 | 通知列表、标记已读 |

@@ -28,7 +28,7 @@
 | [admin/user.md](admin/user.md) | 用户管理 | ✅ Phase 1 | 用户列表/详情、状态管理、角色分配、创建用户 |
 | [admin/online.md](admin/online.md) | 在线监控 | ✅ Phase 2a | 在线用户列表、在线用户计数 |
 | [admin/contact.md](admin/contact.md) | 好友关系管理 | ✅ Phase 2a | 好友关系列表（分页）、管理员解除好友关系 |
-| [admin/group.md](admin/group.md) | 群聊管理 | 🔜 Phase 2c | 群列表/详情、管理员解散群/移除成员 |
+| [admin/group.md](admin/group.md) | 群聊管理 | ✅ Phase 2c | 群列表/详情、管理员解散群聊 |
 | [admin/meeting.md](admin/meeting.md) | 会议管理 | 📋 后续 | 会议列表/详情、强制结束、会议统计 |
 | [admin/system.md](admin/system.md) | 系统管理 | 📋 待定 | 仪表盘数据、操作日志、系统配置 |

@@ -196,7 +196,8 @@ docs/api/
 │   ├── auth.md            # 用户认证                    ✅ Phase 1
 │   ├── contact.md         # 联系人管理（17 个 API）      ✅ Phase 2a
 │   ├── websocket.md       # WebSocket 事件协议          ✅ Phase 2a
-│   ├── im.md              # 即时通讯（7 个 API）          ✅ Phase 2b
+│   ├── im.md              # 即时通讯（8 个 API）          ✅ Phase 2b/2c
+│   ├── group.md           # 群聊管理（16 个 API）         ✅ Phase 2c
 │   ├── meeting.md         # 会议                        📋 后续
 │   └── notify.md          # 通知                        📋 后续
 ├── admin/                 # 后台管理端 API
@@ -204,7 +205,8 @@ docs/api/
 │   ├── user.md            # 用户管理                     ✅ Phase 1
 │   ├── online.md          # 在线监控                     ✅ Phase 2a
 │   ├── contact.md         # 好友关系管理                  ✅ Phase 2a
+│   ├── group.md           # 群聊管理（3 个 API）          ✅ Phase 2c
 │   ├── meeting.md         # 会议管理                     📋 后续
 │   └── system.md          # 系统管理                     📋 待定
-└── websocket.md           # WebSocket 全量事件协议       ✅ Phase 2a/2b
+└── websocket.md           # WebSocket 全量事件协议       ✅ Phase 2a/2b/2c
 ```
--- a/docs/api/websocket.md
+++ b/docs/api/websocket.md
@@ -435,3 +435,214 @@
    "message": "我是你的同事"
 }
 ```
+
+---
+
+## 群聊事件（Phase 2c）
+
+### im.group.read
+
+**方向：** 客户端 → 服务端
+
+**说明：** 标记群聊消息已读（消息级已读回执）
+
+**data 内容：**
+```json
+{
+    "conversation_id": 100,
+    "message_ids": [501, 502, 503]
+}
+```
+
+**ACK 响应：** `{ "code": 0, "message": "ok" }`
+
+---
+
+### group.created
+
+**方向：** 服务端 → 客户端
+
+**说明：** 群聊创建成功，推送给所有初始成员
+
+**data 内容：**
+```json
+{
+    "group_id": 10,
+    "conversation_id": 100,
+    "name": "项目讨论组",
+    "owner_id": 1
+}
+```
+
+---
+
+### group.info.update
+
+**方向：** 服务端 → 客户端
+
+**说明：** 群信息更新（名称、头像、公告等），推送给所有群成员
+
+**data 内容：**
+```json
+{
+    "group_id": 10,
+    "conversation_id": 100,
+    "operator_id": 1
+}
+```
+
+---
+
+### group.dissolved
+
+**方向：** 服务端 → 客户端
+
+**说明：** 群聊已解散，推送给所有群成员
+
+**data 内容：**
+```json
+{
+    "group_id": 10,
+    "conversation_id": 100,
+    "operator_id": 1
+}
+```
+
+---
+
+### group.member.join
+
+**方向：** 服务端 → 客户端
+
+**说明：** 新成员加入群聊（邀请加入或审批通过），推送给所有群成员
+
+**data 内容：**
+```json
+{
+    "group_id": 10,
+    "conversation_id": 100,
+    "user_ids": [5, 6]
+}
+```
+
+---
+
+### group.member.kicked
+
+**方向：** 服务端 → 客户端
+
+**说明：** 成员被移出群聊，推送给所有群成员
+
+**data 内容：**
+```json
+{
+    "group_id": 10,
+    "conversation_id": 100,
+    "user_id": 5,
+    "operator_id": 1
+}
+```
+
+---
+
+### group.member.leave
+
+**方向：** 服务端 → 客户端
+
+**说明：** 成员主动退出群聊，推送给其余群成员
+
+**data 内容：**
+```json
+{
+    "group_id": 10,
+    "conversation_id": 100,
+    "user_id": 5
+}
+```
+
+---
+
+### group.role.update
+
+**方向：** 服务端 → 客户端
+
+**说明：** 成员角色变更（设为/取消管理员），推送给所有群成员
+
+**data 内容：**
+```json
+{
+    "group_id": 10,
+    "conversation_id": 100,
+    "user_id": 5,
+    "new_role": 1,
+    "operator_id": 1
+}
+```
+
+> `new_role`：0=普通成员，1=管理员，2=群主
+
+---
+
+### group.mute.update
+
+**方向：** 服务端 → 客户端
+
+**说明：** 禁言状态变更（个人禁言或全体禁言），推送给所有群成员
+
+**data 内容（个人禁言）：**
+```json
+{
+    "group_id": 10,
+    "conversation_id": 100,
+    "user_id": 5,
+    "is_muted": true,
+    "operator_id": 1
+}
+```
+
+**data 内容（全体禁言）：**
+```json
+{
+    "group_id": 10,
+    "conversation_id": 100,
+    "is_all_muted": true,
+    "operator_id": 1
+}
+```
+
+---
+
+### group.owner.transfer
+
+**方向：** 服务端 → 客户端
+
+**说明：** 群主转让，推送给所有群成员
+
+**data 内容：**
+```json
+{
+    "group_id": 10,
+    "conversation_id": 100,
+    "old_owner_id": 1,
+    "new_owner_id": 5
+}
+```
+
+---
+
+### group.join.request
+
+**方向：** 服务端 → 客户端
+
+**说明：** 新的入群申请，推送给群主和管理员
+
+**data 内容：**
+```json
+{
+    "group_id": 10,
+    "request_id": 20,
+    "user_id": 8,
+    "user_nickname": "新用户",
+    "message": "请让我加入"
+}
+```
--- a/docs/architecture/system-architecture.md
+++ b/docs/architecture/system-architecture.md
@@ -92,11 +92,11 @@ EchoChat 采用 **「精简单体 + 媒体微服务」** 架构，核心思想
 | ws | WebSocket 连接管理（Hub/Client/PubSub）、在线状态管理（Redis SET + TTL 心跳续期）、好友上下线实时通知（FriendIDsGetter 接口注入） | ✅ Phase 2a |
 | contact | 好友关系管理（申请/接受/拒绝/删除/拉黑）、好友分组（CRUD + 移动）、用户搜索、好友推荐（批量查询优化） | ✅ Phase 2a |
 | im | 即时消息收发（单聊）、会话管理、消息存储、撤回、搜索、离线推送 | ✅ Phase 2b |
-| group | 群聊管理（建群/加入/退出/角色/禁言/@提醒/群公告/入群审批） | 🔜 Phase 2c |
-| file | 文件上传（MinIO 对象存储 + 通用上传 API） | 🔜 Phase 2c |
+| group | 群聊管理（建群/加入/退出/角色/禁言/@提醒/群公告/入群审批） | ✅ Phase 2c |
+| file | 文件上传（MinIO 对象存储 + 通用上传 API） | ✅ Phase 2c |
 | meeting | 会议创建/管理、信令转发、mediasoup 资源编排 | 📋 后续 |
 | notify | 通知推送、会议邀请、好友申请通知 | 📋 后续 |
-| admin | 后台管理（用户管理 + 角色权限管理 + 在线监控 + 好友关系管理 + 群聊管理、会议监控、系统配置） | ✅ Phase 1/2a, 🔜 2c |
+| admin | 后台管理（用户管理 + 角色权限管理 + 在线监控 + 好友关系管理 + 群聊管理、会议监控、系统配置） | ✅ Phase 1/2a/2c |

 **不负责的事情：** 不处理 RTP 媒体数据、不参与音视频转发、不做 WebRTC 协议协商。

--- a/docs/conventions/backend-module-architecture.md
+++ b/docs/conventions/backend-module-architecture.md
@@ -2,9 +2,11 @@

 > **适用范围**：EchoChat Go 后端（`backend/go-service/`）
 > **创建日期**：2026-03-04
-> **最后更新**：2026-03-04（Phase 2c 设计阶段整理）
+> **最后更新**：2026-03-04（基于全量代码审查，以实际代码为准）
 > **关联文档**：`docs/conventions/frontend-backend-integration.md`

+**核心原则：本文档所有代码模板均直接摘自项目现有代码，编写新模块时必须严格遵循，禁止自创新模式。**
+
 ---

 ## 一、模块分层架构
@@ -14,13 +16,13 @@
 ```
 app/{module_name}/
 ├── controller/
-│   └── {module}_controller.go   # HTTP 请求处理（参数绑定/校验 → 调用 Service → 响应）
+│   └── {module}_controller.go   # HTTP 请求处理
 ├── service/
-│   └── {module}_service.go      # 业务逻辑（事务协调、权限校验、多 DAO 编排）
+│   └── {module}_service.go      # 业务逻辑
 ├── dao/
-│   └── {module}_dao.go          # 数据访问（GORM 操作，不含业务逻辑）
+│   └── {module}_dao.go          # 数据访问
 ├── model/
-│   └── {module}.go              # 数据模型（GORM 结构体，对应数据库表）
+│   └── {module}.go              # 数据模型
 ├── handler/
 │   └── {module}_handler.go      # [可选] WS 事件处理器
 ├── router.go                    # 路由注册
@@ -46,254 +48,417 @@ Controller → Service → DAO → 数据库

 ---

-## 三、跨模块接口注入模式
+## 三、日志 API（以实际代码为准，严禁使用不存在的 API）
+
+项目 logs 包（`pkg/logs`）**只有以下 5 个公开日志方法**：
+
+```go
+logs.Debug(ctx, funcName, message, ...zap.Field)
+logs.Info(ctx, funcName, message, ...zap.Field)
+logs.Warn(ctx, funcName, message, ...zap.Field)
+logs.Error(ctx, funcName, message, ...zap.Field)
+logs.Fatal(ctx, funcName, message, ...zap.Field)
+```
+
+辅助方法：`logs.Init()`, `logs.Sync()`, `logs.GetTraceID()`, `logs.MaskEmail()`
+
+**不存在的 API（严禁调用）**：`LogFunctionEntry`、`LogFunctionExit`、`LogSuccess`、`LogFailure` 等均不存在。
+
+**funcName 命名规则**：`"{层级}.{文件名}.{方法名}"`
+- DAO 层：`"dao.conversation_dao.FindPrivateConversation"`
+- Service 层：`"service.im_service.SendMessage"`
+- Controller 层：`"controller.auth_controller.Register"`
+
+---
+
+## 四、Controller 层代码风格
+
+项目中存在两种 Controller 风格，新模块应根据所属类型选择对应风格：
+
+### 4.1 前台业务模块 Controller（contact/im 模块风格）
+
+**适用于**：contact、im、group、file 等前台用户端业务模块
+
+**特征**：接收器 `ctl`，不记日志，方法级 `handleError`
+
+```go
+// 摘自 app/contact/controller/contact_controller.go（实际代码）
+package controller
+
+import (
+    "strconv"
+    "github.com/echochat/backend/app/contact/service"
+    "github.com/echochat/backend/app/dto"
+    "github.com/echochat/backend/pkg/middleware"
+    "github.com/echochat/backend/pkg/utils"
+    "github.com/gin-gonic/gin"
+)
+
+type ContactController struct {
+    contactService *service.ContactService
+}
+
+func NewContactController(contactService *service.ContactService) *ContactController {
+    return &ContactController{contactService: contactService}
+}
+
+// GetFriendList 获取好友列表
+// GET /api/v1/contacts?group_id=xx
+func (ctl *ContactController) GetFriendList(c *gin.Context) {
+    ctx := c.Request.Context()
+    userID, ok := middleware.GetCurrentUserID(c)
+    if !ok {
+        utils.ResponseUnauthorized(c, "无法获取当前用户信息")
+        return
+    }
+    // ... 参数解析 ...
+    friends, err := ctl.contactService.GetFriendList(ctx, userID, groupID)
+    if err != nil {
+        ctl.handleError(c, err, "获取好友列表失败")
+        return
+    }
+    utils.ResponseOK(c, friends)
+}
+
+// handleError 统一业务错误映射
+func (ctl *ContactController) handleError(c *gin.Context, err error, fallbackMsg ...string) {
+    switch err {
+    case service.ErrSelfRequest:
+        utils.ResponseBadRequest(c, err.Error())
+    case service.ErrAlreadyFriend:
+        utils.ResponseBadRequest(c, err.Error())
+    // ... 覆盖所有已知业务错误 ...
+    default:
+        msg := "服务器内部错误"
+        if len(fallbackMsg) > 0 && fallbackMsg[0] != "" {
+            msg = fallbackMsg[0]
+        }
+        utils.ResponseError(c, msg)
+    }
+}
+```
+
+**关键要点**：
+- 接收器变量名：`ctl`
+- **不导入** `logs` 和 `zap`，不记日志
+- 没有 `funcName` 变量
+- 用 `ctx := c.Request.Context()` 获取上下文
+- 用 `middleware.GetCurrentUserID(c)` 获取当前用户
+- `handleError` 是**方法**（不是包级函数），签名 `(c *gin.Context, err error, fallbackMsg ...string)`
+- 响应统一用 `utils.ResponseOK/ResponseBadRequest/ResponseError` 等
+- 参数绑定：JSON 用 `c.ShouldBindJSON(&req)`，Query 用 `c.ShouldBindQuery(&req)`
+
+### 4.2 auth/admin 模块 Controller 风格
+
+**适用于**：auth、admin 模块（涉及安全审计和管理操作，需要更详细的日志）
+
+**特征**：接收器 `ctrl`/`ctl`，有 funcName+logs+zap，包级函数 `handleAuthError` 或内联错误处理
+
+```go
+// 摘自 app/auth/controller/auth_controller.go（实际代码）
+func (ctrl *AuthController) Register(c *gin.Context) {
+    funcName := "controller.auth_controller.Register"
+    ctx := c.Request.Context()
+
+    var req dto.RegisterRequest
+    if err := c.ShouldBindJSON(&req); err != nil {
+        logs.Warn(ctx, funcName, "参数校验失败", zap.Error(err))
+        utils.ResponseBadRequest(c, "参数校验失败: "+err.Error())
+        return
+    }
+
+    logs.Info(ctx, funcName, "注册请求",
+        zap.String("username", req.Username),
+        zap.String("email", logs.MaskEmail(req.Email)),
+    )
+
+    resp, err := ctrl.authService.Register(ctx, &req)
+    if err != nil {
+        handleAuthError(c, err, "注册失败")
+        return
+    }
+    utils.ResponseOK(c, resp)
+}
+```
+
+---
+
+## 五、Service 层代码风格（统一）
+
+所有模块的 Service 层风格一致。
+
+```go
+// 摘自 app/im/service/im_service.go + app/contact/service/contact_service.go（实际代码）
+package service
+
+import (
+    "context"
+    "errors"
+    "github.com/echochat/backend/app/xxx/dao"
+    "github.com/echochat/backend/app/dto"
+    "github.com/echochat/backend/pkg/logs"
+    "go.uber.org/zap"
+)
+
+// 错误变量在包顶部定义
+var (
+    ErrNotFriend    = errors.New("对方不是你的好友")
+    ErrEmptyContent = errors.New("消息内容不能为空")
+    // ...
+)
+
+type IMService struct {
+    convDAO       *dao.ConversationDAO
+    msgDAO        *dao.MessageDAO
+    // ...
+}
+
+func NewIMService(...) *IMService {
+    return &IMService{...}
+}
+
+// SendMessage 发送消息
+func (s *IMService) SendMessage(ctx context.Context, senderID int64, req *dto.SendMessageRequest) (*dto.MessageDTO, error) {
+    funcName := "service.im_service.SendMessage"
+    logs.Info(ctx, funcName, "发送消息",
+        zap.Int64("sender_id", senderID),
+        zap.Int64("conversation_id", req.ConversationID))
+
+    // 业务逻辑...
+    if err != nil {
+        logs.Error(ctx, funcName, "操作失败", zap.Error(err))
+        return nil, err
+    }
+    return result, nil
+}
+```
+
+**关键要点**：
+- 接收器变量名：`s`
+- 每个公开方法开头声明 `funcName` 并记一次 Info/Debug 日志
+- 错误时记 `logs.Error` 日志
+- 错误定义为包级 `var ErrXxx = errors.New("中文描述")`
+- 跨模块依赖通过 interface 注入（定义在 Service 包内）
+
+---
+
+## 六、DAO 层代码风格（统一）
+
+```go
+// 摘自 app/im/dao/conversation_dao.go（实际代码）
+type ConversationDAO struct {
+    db *gorm.DB
+}
+
+func NewConversationDAO(db *gorm.DB) *ConversationDAO {
+    return &ConversationDAO{db: db}
+}
+
+func (d *ConversationDAO) FindPrivateConversation(ctx context.Context, userID, targetUserID int64) (*model.Conversation, error) {
+    funcName := "dao.conversation_dao.FindPrivateConversation"
+    logs.Debug(ctx, funcName, "查找单聊会话",
+        zap.Int64("user_id", userID), zap.Int64("target_user_id", targetUserID))
+
+    var conv model.Conversation
+    err := d.db.WithContext(ctx).
+        Raw(`SELECT ...`, userID, targetUserID).
+        Scan(&conv).Error
+
+    if err != nil {
+        logs.Error(ctx, funcName, "查找单聊会话失败", zap.Error(err))
+        return nil, err
+    }
+    if conv.ID == 0 {
+        return nil, nil
+    }
+    return &conv, nil
+}
+```
+
+**关键要点**：
+- 接收器变量名：`d`
+- 所有 DB 操作使用 `d.db.WithContext(ctx)`
+- 查询方法开头记 `logs.Debug`，写操作记 `logs.Info`
+- 错误时记 `logs.Error`
+
+---
+
+## 七、Router 代码风格
+
+```go
+// 摘自 app/contact/router.go（实际代码）
+package contact
+
+import (
+    "github.com/echochat/backend/app/contact/controller"
+    "github.com/gin-gonic/gin"
+)
+
+func RegisterRoutes(r *gin.Engine, ctrl *controller.ContactController, jwtAuth gin.HandlerFunc) {
+    authed := r.Group("/api/v1")
+    authed.Use(jwtAuth)
+    {
+        authed.GET("/contacts", ctrl.GetFriendList)
+        authed.POST("/contacts/request", ctrl.SendFriendRequest)
+        // ...
+    }
+}
+```
+
+**关键要点**：
+- 函数签名：`RegisterRoutes(r *gin.Engine, ctrl *controller.XxxController, jwtAuth gin.HandlerFunc)`
+- 参数名用 `r`（不是 `engine`）
+- 路由组用 `r.Group(...)` + `.Use(jwtAuth)`
+
+---
+
+## 八、Provider 代码风格
+
+```go
+// 摘自 app/contact/provider.go（简洁风格）
+package contact
+
+import (
+    "github.com/echochat/backend/app/contact/controller"
+    "github.com/echochat/backend/app/contact/dao"
+    "github.com/echochat/backend/app/contact/service"
+    "github.com/google/wire"
+)
+
+var ContactSet = wire.NewSet(
+    dao.NewFriendshipDAO,
+    dao.NewFriendGroupDAO,
+    service.NewContactService,
+    controller.NewContactController,
+)
+```
+
+**ProviderSet 命名**：`{ModuleName}Set`（如 `AuthSet`、`ContactSet`、`IMSet`、`FileSet`、`GroupSet`）
+
+---
+
+## 九、常量定义风格
+
+```go
+// 摘自 app/constants/im.go（实际代码）
+package constants
+
+const (
+    ConversationTypePrivate = 1
+    ConversationTypeGroup   = 2
+)
+
+var ConversationTypeMap = map[int]string{
+    ConversationTypePrivate: "单聊",
+    ConversationTypeGroup:   "群聊",
+}
+```
+
+**关键要点**：
+- 常量命名 camelCase：`GroupStatusNormal`（不是 `GROUP_STATUS_NORMAL`）
+- 每组常量配套一个 `XxxMap` 中文映射
+- 文件按模块拆分：`im.go`、`contact.go`、`group.go`
+
+---
+
+## 十、DTO 定义风格
+
+```go
+// 摘自 app/dto/im_dto.go（实际代码）
+package dto
+
+type SendMessageRequest struct {
+    ConversationID int64  `json:"conversation_id"`
+    TargetUserID   int64  `json:"target_user_id"`
+    Type           int    `json:"type"`
+    Content        string `json:"content"`
+    ClientMsgID    string `json:"client_msg_id"`
+}
+
+type MessageDTO struct {
+    ID             int64  `json:"id"`
+    ConversationID int64  `json:"conversation_id"`
+    // ...
+}
+```
+
+**关键要点**：
+- 按模块分文件：`im_dto.go`、`contact_dto.go`、`admin_dto.go`、`group_dto.go`
+- Request 用 `json` tag（POST body）或 `form` tag（GET query）
+- Response 用 `json` tag + `omitempty` 可选
+- 时间字段在 DTO 中用 `string` 类型（格式化后的 `"2006-01-02 15:04:05"`）
+
+---
+
+## 十一、Model 定义风格
+
+```go
+// 摘自 app/im/model/conversation.go（实际代码）
+package model
+
+import "time"
+
+type Conversation struct {
+    ID            int64      `json:"id" gorm:"primaryKey;autoIncrement"`
+    Type          int        `json:"type" gorm:"not null;default:1"`
+    CreatorID     int64      `json:"creator_id" gorm:"not null"`
+    LastMessageID *int64     `json:"last_message_id"`
+    CreatedAt     time.Time  `json:"created_at" gorm:"not null;autoCreateTime;type:timestamp(0)"`
+    UpdatedAt     time.Time  `json:"updated_at" gorm:"not null;autoUpdateTime;type:timestamp(0)"`
+}
+
+func (Conversation) TableName() string {
+    return "im_conversations"
+}
+```
+
+**关键要点**：
+- 必须有 `TableName()` 方法
+- 时间字段用 `time.Time`，GORM tag 含 `type:timestamp(0)`
+- 可选字段用指针类型（`*int64`、`*time.Time`、`*string`）
+- 每个字段必须有注释说明用途
+
+---
+
+## 十二、跨模块接口注入模式

 模块间通信通过 **interface injection** 实现，禁止直接 import 其他模块包。

-### 3.1 标准流程
+### 标准流程

 ```
-步骤1: 在消费方 Service 中定义 interface（如 im/service → GroupMemberChecker）
-步骤2: 在提供方 DAO 中实现该接口（如 group/dao.GroupDAO）
-步骤3: 在 app/provider/wire.go 中用 wire.Bind 绑定接口和实现
-步骤4: 重新生成 wire_gen.go
+步骤1: 在消费方 Service 中定义 interface
+步骤2: 在提供方 DAO 中实现该接口
+步骤3: 在 app/provider/wire.go 中用 wire.Bind 绑定
+步骤4: 更新 wire_gen.go
 ```

-### 3.2 接口命名约定
-
-| 接口类型 | 命名模式 | 示例 |
-|---------|---------|------|
-| 数据查询 | `{Entity}{Action}er` | `FriendIDsGetter`, `GroupInfoGetter` |
-| 状态检查 | `{Entity}{State}Checker` | `GroupMemberChecker`, `OnlineChecker` |
-| 操作执行 | `{Entity}{Action}er` | `OfflineMessagePusher` |
-
-### 3.3 已有接口注入清单
+### 已有接口注入清单

 | 接口 | 定义方 | 实现方 | 用途 |
 |------|--------|--------|------|
 | FriendIDsGetter | ws/handler | contact/dao | 获取用户好友 ID 列表 |
 | FriendChecker | im/service | contact/dao | 检查是否为好友 |
-| UserInfoGetter | im/service | auth/dao | 获取用户信息 |
+| UserInfoGetter | im/service | contact/dao | 获取用户信息 |
 | OnlineChecker | contact/service | ws/service | 检查在线状态 |
-| OfflineMessagePusher | im/service | ws/handler | 离线消息推送 |
-| GroupMemberChecker | im/service | group/dao | 检查群成员身份（Phase 2c） |
-| GroupInfoGetter | im/service | group/dao | 获取群信息（Phase 2c） |
-| GroupRoleChecker | im/service | group/dao | 检查用户群角色（Phase 2c） |
+| TokenValidator | ws/handler | auth/service | WS 连接 Token 校验 |

 ---

-## 四、Wire 依赖注入规范
+## 十三、批量查询优化

- 每个模块在 `provider.go` 中导出 `ProviderSet`（`wire.NewSet(...)`）
- 接口绑定统一在 `app/provider/wire.go` 中声明
- 修改 wire.go 后必须重新运行 `wire gen ./app/provider/` 生成 wire_gen.go
- Wire 有过手动 patch 历史（Phase 2b），修改后需检查 wire_gen.go 一致性
+获取关联信息时，**必须使用批量查询 + Map 映射，严禁 N+1 查询**。

 ---

-## 五、日志记录标准
+## 十四、系统消息规范（Phase 2c+）

-所有 DAO 和 Service 的公开方法必须记录入口和出口日志：
-
-```go
-func (d *SomeDAO) SomeMethod(ctx context.Context, param int64) (result *Model, err error) {
-    funcName := "dao.some_dao.SomeMethod"
-
-    logs.LogFunctionEntry(ctx, funcName, map[string]interface{}{
-        "param": param,
-    })
-
-    defer func() {
-        logs.LogFunctionExit(ctx, funcName, result, err)
-    }()
-
-    // 业务逻辑
-    return result, err
-}
-```
-
-**funcName 命名规则：** `{层级}.{模块}_{文件}.{方法名}`
- DAO 层：`dao.group_dao.CreateGroup`
- Service 层：`service.group_service.CreateGroup`
- Controller 层：`controller.group_controller.CreateGroup`
+系统消息写入 `im_messages` 表，`type=10`（`MessageTypeSystem`），`sender_id=0`（表示系统），`content` 使用**纯文本格式**。前端居中显示、灰色小字体、无头像、无气泡。

 ---

-## 六、Controller 错误处理标准
+## 十五、依赖管理

-```go
-func (ctrl *Controller) HandleAction(c *gin.Context) {
-    funcName := "controller.module.HandleAction"
-
-    // 参数绑定
-    var req dto.SomeRequest
-    if err := c.ShouldBindJSON(&req); err != nil {
-        utils.ResponseBadRequest(c, "参数校验失败: "+err.Error())
-        return
-    }
-
-    // 调用 Service
-    result, err := ctrl.service.DoAction(c.Request.Context(), &req)
-    if err != nil {
-        ctrl.handleError(c, funcName, err)
-        return
-    }
-
-    utils.ResponseOK(c, "操作成功", result)
-}
-
-// handleError 必须覆盖所有已知业务错误
-func (ctrl *Controller) handleError(c *gin.Context, funcName string, err error) {
-    switch err {
-    case service.ErrNotFound:
-        utils.ResponseNotFound(c, err.Error())
-    case service.ErrPermission:
-        utils.ResponseForbidden(c, err.Error())
-    // ... 覆盖所有已知错误
-    default:
-        logs.Error(c.Request.Context(), funcName, "操作失败", zap.Error(err))
-        utils.ResponseError(c, "操作失败")
-    }
-}
-```
-
-**关键要求：**
- `handleError` 必须覆盖所有已知业务错误，不能用 `default` 笼统处理
- 错误 message 使用中文，面向用户
- 未知错误必须记录日志
-
---
-
-## 七、批量查询优化
-
-获取关联信息时，**必须使用批量查询 + Map 映射，严禁 N+1 查询**：
-
-```go
-// ✅ 正确：批量查询
-userIDs := extractUserIDs(members)
-users, _ := userDAO.GetByIDs(ctx, userIDs)
-userMap := make(map[int64]*User)
-for _, u := range users {
-    userMap[u.ID] = u
-}
-for _, m := range members {
-    m.Nickname = userMap[m.UserID].Nickname
-}
-
-// ❌ 错误：N+1 查询
-for _, m := range members {
-    user, _ := userDAO.GetByID(ctx, m.UserID)
-    m.Nickname = user.Nickname
-}
-```
-
---
-
-## 八、系统消息规范（Phase 2c+）
-
-### 8.1 系统消息定义
-
-系统消息是由服务端自动生成的提示类消息，写入 `im_messages` 表，type=10（`MessageTypeSystem`）。
-
-### 8.2 内容格式
-
-系统消息的 `content` 字段使用**纯文本格式**，不使用 JSON 结构。
-
-### 8.3 前端渲染
-
-系统消息在聊天页面中**居中显示，灰色小字体，无头像，无气泡**。
-
-### 8.4 sender_id
-
-系统消息的 `sender_id` 设为 0（表示系统），前端根据 sender_id=0 和 type=10 判断为系统消息。
-
---
-
-## 九、WS 事件推送模式
-
-### 9.1 S→C 推送（Service 层触发）
-
-```go
-pubsub.PublishToUser(ctx, targetUserID, &ws.Message{
-    Event: "group.member.join",
-    Data:  map[string]interface{}{...},
-})
-
-pubsub.PublishToUsers(ctx, memberIDs, &ws.Message{
-    Event: "im.message.new",
-    Data:  messageDTO,
-})
-```
-
-### 9.2 C→S 事件处理（Hub 事件路由表注册）
-
-```go
-hub.RegisterEvent("im.message.send", handler.HandleSendMessage)
-hub.RegisterEvent("im.message.read", handler.HandleReadMessage)
-```
-
---
-
-## 十、前端 Store 与 API 封装规范
-
-### 10.1 API 封装标准
-
-文件位置：`frontend/src/api/{module}.js`
-
-```javascript
-import request from '@/utils/request'
-
-// 获取群详情
-export function getGroupDetail(groupId) {
-  return request.get(`/groups/${groupId}`)
-}
-
-// 创建群聊
-export function createGroup(data) {
-  return request.post('/groups', data)
-}
-```
-
-**命名规则：**
- GET 请求：`get{Entity}` / `get{Entity}List`
- POST 请求：`create{Entity}` / `{action}{Entity}`
- PUT 请求：`update{Entity}` / `set{Entity}{Field}`
- DELETE 请求：`delete{Entity}` / `remove{Entity}`
-
-### 10.2 Pinia Store 标准结构
-
-文件位置：`frontend/src/store/{module}.js`
-
-```javascript
-import { defineStore } from 'pinia'
-
-export const useGroupStore = defineStore('group', {
-  state: () => ({
-    conversations: [],      // 群会话列表
-    currentGroup: null,      // 当前群详情
-    messages: {},            // {conversationId: Message[]}
-    members: {},             // {groupId: Member[]}
-  }),
-
-  getters: {
-    unreadTotal: (state) => { ... },
-  },
-
-  actions: {
-    // 初始化 WS 事件监听（在 App.vue onLaunch 中调用）
-    initWsListeners() { ... },
-
-    // 加载群会话列表
-    async loadConversations() { ... },
-
-    // 发送群消息
-    async sendMessage(conversationId, content, atUserIds) { ... },
-  }
-})
-```
-
-**Store 设计原则：**
-1. **单一职责**：每个模块一个 Store，不混合不同模块数据
-2. **WS 监听统一初始化**：所有 Store 的 WS 事件监听在 `App.vue` 的 `_initGlobalWS` 中统一调用
-3. **消息缓存**：按 conversationId 键值对缓存，避免重复请求
-4. **乐观更新**：发送消息时先本地插入，再等待服务端 ack 确认
+- 添加新依赖前必须检查 `go.mod` 中的 Go 版本（当前 `go 1.23.12`）
+- 选择与当前 Go 版本兼容的包版本，禁止触发 Go 工具链自动升级
+- 优先复用 `go.mod` 中已有的间接依赖
--- a/docs/conventions/frontend-backend-integration.md
+++ b/docs/conventions/frontend-backend-integration.md
@@ -2,7 +2,7 @@

 > **适用范围**：EchoChat 项目全端（Go 后端 + admin 管理端 + frontend 用户端）
 > **创建日期**：2026-03-02
-> **最后更新**：2026-03-04（Phase 2c 设计完成：新增群聊模块、MinIO 文件存储、已读回执规划）
+> **最后更新**：2026-03-04（Phase 2c 全部完成：群聊模块 + MinIO 文件存储 + 已读回执 + 代码审查修复 14 项）

 ---

--- a/docs/plans/2026-02-27-echochat-system-design.md
+++ b/docs/plans/2026-02-27-echochat-system-design.md
@@ -718,7 +718,7 @@ DELETE /api/v1/im/conversations/:id/messages     清空聊天记录（个人视
 GET    /api/v1/im/messages/search                全局消息搜索（GIN 全文索引）
 GET    /api/v1/im/unread                         全局未读消息总数

-# 群聊管理模块（Phase 2c 规划）
+# 群聊管理模块（✅ Phase 2c 完成）
 POST   /api/v1/groups                              创建群聊
 GET    /api/v1/groups/:id                           群详情
 PUT    /api/v1/groups/:id                           更新群信息
@@ -736,11 +736,11 @@ GET    /api/v1/groups/:id/join-requests             入群申请列表
 PUT    /api/v1/groups/:id/join-requests/:rid        审批入群申请
 GET    /api/v1/groups/search                        搜索公开群

-# 已读回执（Phase 2c 规划）
+# 已读回执（✅ Phase 2c 完成）
 GET    /api/v1/im/messages/:id/reads               消息已读详情
 GET    /api/v1/im/messages/:id/read-count          消息已读计数

-# 文件上传（Phase 2c 规划）
+# 文件上传（✅ Phase 2c 完成）
 POST   /api/v1/upload                               通用文件上传（MinIO）

 # 会议模块
@@ -782,7 +782,7 @@ GET    /api/v1/admin/online/count         在线用户数
 GET    /api/v1/admin/contacts             所有好友关系（分页）
 DELETE /api/v1/admin/contacts/:id         管理员解除好友关系

-# 群聊管理（Phase 2c 规划）
+# 群聊管理（✅ Phase 2c 完成）
 GET    /api/v1/admin/groups               群列表（分页 + 筛选）
 GET    /api/v1/admin/groups/:id           群详情（含成员列表）
 DELETE /api/v1/admin/groups/:id           管理员解散群
--- a/docs/plans/2026-03-04-phase2c-design.md
+++ b/docs/plans/2026-03-04-phase2c-design.md
@@ -1,6 +1,6 @@
 # Phase 2c 设计文档：群聊与已读回执

-> **状态：** 📋 设计完成，待实施
+> **状态：** ✅ 已完成实施（含代码审查修复 14 项）
 > **分支：** `feature/phase2c-group-read-receipt`
 > **前置依赖：** Phase 2b 全部完成（单聊即时通讯）
 > **最后更新：** 2026-03-04
--- a/docs/plans/2026-03-04-phase2c-implementation.plan.md
+++ b/docs/plans/2026-03-04-phase2c-implementation.plan.md
@@ -1,9 +1,9 @@
 # Phase 2c 实施计划：群聊与已读回执

-> **状态：** 📋 待执行
+> **状态：** ✅ 已完成（含代码审查修复 14 项）
 > **设计文档：** `docs/plans/2026-03-04-phase2c-design.md`
 > **分支：** `feature/phase2c-group-read-receipt`
-> **预计 Task 数：** 14 个
+> **预计 Task 数：** 14 个（全部完成）
 > **最后更新：** 2026-03-04

 ---
@@ -12,20 +12,20 @@

 | Task | 阶段 | 描述 | 依赖 | 状态 |
 |------|------|------|------|------|
-| Task 0 | 基础设施 | MinIO Docker + SDK + 通用上传 API | 无 | 📋 |
-| Task 1 | 基础设施 | 数据库迁移 + Model + 常量定义 | 无 | 📋 |
-| Task 2 | 群聊后端 | Group DAO 层 | Task 1 | 📋 |
-| Task 3 | 群聊后端 | Group Service 业务逻辑 | Task 2 | 📋 |
-| Task 4 | 群聊后端 | Group Controller + Router + Wire | Task 3 | 📋 |
-| Task 5 | 群聊后端 | WS 群管理事件处理器 | Task 3 | 📋 |
-| Task 6 | 群聊后端 | IM Service 扩展（群消息 + @提醒 + 管理员撤回） | Task 2 | 📋 |
-| Task 7 | 已读回执 | 已读回执后端（ReadDAO + Service + API + WS 推送） | Task 1 | 📋 |
-| Task 8 | 已读回执 | 前端已读回执 UI（单聊标记 + 群聊计数 + 详情页） | Task 7 | 📋 |
-| Task 9 | 前端 | 群聊 Store + API 封装 + WS 事件监听 | Task 4, 5 | 📋 |
-| Task 10 | 前端 | 群聊核心页面（Tab 改造 + 群对话页 + 创建群页） | Task 9 | 📋 |
-| Task 11 | 前端 | 群聊管理页面（群设置 + 成员 + 邀请 + @选择器） | Task 10 | 📋 |
-| Task 12 | 前端 | 群聊辅助功能（审批 + 搜索 + 免打扰 + 公告 UI） | Task 11 | 📋 |
-| Task 13 | 管理端 | 管理端群聊管理 + 全量文档更新 + 代码审查 | Task 12 | 📋 |
+| Task 0 | 基础设施 | MinIO Docker + SDK + 通用上传 API | 无 | ✅ |
+| Task 1 | 基础设施 | 数据库迁移 + Model + 常量定义 | 无 | ✅ |
+| Task 2 | 群聊后端 | Group DAO 层 | Task 1 | ✅ |
+| Task 3 | 群聊后端 | Group Service 业务逻辑 | Task 2 | ✅ |
+| Task 4 | 群聊后端 | Group Controller + Router + Wire | Task 3 | ✅ |
+| Task 5 | 群聊后端 | WS 群管理事件处理器 | Task 3 | ✅ |
+| Task 6 | 群聊后端 | IM Service 扩展（群消息 + @提醒 + 管理员撤回） | Task 2 | ✅ |
+| Task 7 | 已读回执 | 已读回执后端（ReadDAO + Service + API + WS 推送） | Task 1 | ✅ |
+| Task 8 | 已读回执 | 前端已读回执 UI（单聊标记 + 群聊计数 + 详情页） | Task 7 | ✅ |
+| Task 9 | 前端 | 群聊 Store + API 封装 + WS 事件监听 | Task 4, 5 | ✅ |
+| Task 10 | 前端 | 群聊核心页面（Tab 改造 + 群对话页 + 创建群页） | Task 9 | ✅ |
+| Task 11 | 前端 | 群聊管理页面（群设置 + 成员 + 邀请 + @选择器） | Task 10 | ✅ |
+| Task 12 | 前端 | 群聊辅助功能（审批 + 搜索 + 免打扰 + 公告 UI） | Task 11 | ✅ |
+| Task 13 | 管理端 | 管理端群聊管理 + 全量文档更新 + 代码审查 | Task 12 | ✅ |

 ---

@@ -553,10 +553,75 @@ Task 0 + Task 12 ── Task 13 (管理端+文档+审查)

 ## 开发注意事项

-1. **代码风格一致性**：严格遵循 Phase 2b 的代码风格（日志记录、错误处理、常量命名、DTO 设计）
-2. **接口注入模式**：新模块间通信必须走 interface injection，禁止直接 import
-3. **批量查询优化**：群成员信息获取使用批量查询 + Map 映射，避免 N+1
-4. **前端设计规范**：所有前端页面使用 ui-ux-pro-max 技能包设计
-5. **系统消息**：群管理操作产生的系统消息统一使用 type=10（MessageTypeSystem），内容格式化
-6. **权限层级**：群主(2) > 管理员(1) > 成员(0)，操作时必须校验层级
-7. **Wire 依赖**：Phase 2b 中 Wire 有过手动 patch 历史，注意检查 wire_gen.go 一致性
+### 代码风格全局一致（最高优先级）
+
+**编写任何新代码前，必须先阅读同层级现有模块的实际代码，严格复制其风格。** 详细规范见 `docs/conventions/backend-module-architecture.md`。
+
+**强制执行流程：**
+1. 写代码前 → 用 Read/Grep 读取同类型现有文件
+2. 写代码时 → 逐行对照导入、结构体、方法签名、日志调用、错误处理
+3. 写代码后 → 与参照文件做差异比对，确认风格完全一致
+
+**各层参照文件（Phase 2c 新模块必读）：**
+
+| 新模块文件 | 参照现有文件 |
+|-----------|------------|
+| group/controller | `app/contact/controller/contact_controller.go`、`app/im/controller/im_controller.go` |
+| group/service | `app/im/service/im_service.go`、`app/contact/service/contact_service.go` |
+| group/dao | `app/im/dao/conversation_dao.go`、`app/contact/dao/friendship_dao.go` |
+| group/model | `app/im/model/conversation.go`、`app/im/model/message.go` |
+| group/router.go | `app/contact/router.go`、`app/im/router.go` |
+| group/provider.go | `app/contact/provider.go` |
+| constants/group.go | `app/constants/im.go`、`app/constants/contact.go` |
+| dto/group_dto.go | `app/dto/im_dto.go`、`app/dto/contact_dto.go` |
+
+**严格禁止事项：**
+- 禁止调用不存在的 API（如 `logs.LogFunctionEntry`）
+- 禁止引入与当前 Go 版本不兼容的依赖
+- 禁止自创新封装模式（如自定义错误处理框架）
+- 禁止在 Controller 层记日志（auth/admin 模块除外）
+- 禁止使用未经项目验证的第三方库
+
+### Code Review 遗留问题清单（Important/Minor）
+
+以下问题在首轮 Code Review 中被标记为 Important 或 Minor，已在后续 Task 中逐步处理。
+
+#### Important 级别
+
+| # | 模块 | 问题 | 修复优先级 |
+|---|------|------|-----------|
+| I-1 | group/service | `UpdateGroup` 中 `_ = member` 无效赋值，应改为 `_, _, err :=` | 低（代码清洁） |
+| I-2 | group/service | `MuteMember` 使用 `ErrCannotKickHigherRole` 语义不精确，应新增通用错误 | 中 |
+| I-3 | group/dao | `SearchGroups` 的 `to_tsquery` 对特殊字符敏感，应改用 `plainto_tsquery` | 高（用户输入安全） |
+| I-4 | group/service | `InviteMembers` 循环逐条插入缺少事务包裹和批量优化 | 中（性能） |
+| I-5 | group/controller | `handleError` 缺少 `ErrAlreadyMuted/ErrUserMuted/ErrGroupAllMuted` 映射 | 高 |
+| I-6 | group/model | `MessageRead` 放在 `group/model` 而非 `im/model`，领域归属可议 | 低（架构决策） |
+| I-7 | im/service | `sendGroupMessage` 推送未检查成员免打扰设置 | 中（业务逻辑） |
+| I-8 | im/service | 群消息推送逐用户查询 N+1 问题 | 中（性能） |
+| I-9 | im/service | WS 群已读事件 `im.message.read` 处理器未注册 | 高（Task 5 实现） |
+| I-10 | im/service | 消息推送数据缺少 `conv_type` 字段 | 高（前端适配） |
+| I-11 | im/service | `GetMessageReadDetail` 无分页参数 | 中 |
+| I-12 | file/service | 文件上传缺少 MIME 类型校验 | 中（安全性） |
+| I-13 | file/service | 上传返回 URL 使用内部地址，应返回可配置前缀 | 中 |
+| I-14 | pkg/storage | MinIO 初始化无超时控制 | 低 |
+
+#### Minor 级别
+
+| # | 模块 | 问题 |
+|---|------|------|
+| M-1 | group/dao | `GetMemberCount` / `GetMemberIDs` 缺少 funcName 和日志 |
+| M-2 | group/dao | `HasRead` 缺少 funcName 和日志 |
+| M-3 | group/provider | 与 IM 模块 Provider 风格略有差异（无 ProvideXxx 包装） |
+| M-4 | group/service | `SearchGroups` 逐群查 `GetMemberCount`，建议批量 COUNT |
+| M-5 | group/service | `imMember` 内部类型可直接使用 `imModel.ConversationMember` |
+| M-6 | group/controller | `SetAllMuted` 使用匿名结构体，建议改用 DTO |
+
+### 其他注意事项
+
+1. **接口注入模式**：新模块间通信必须走 interface injection，禁止直接 import
+2. **批量查询优化**：群成员信息获取使用批量查询 + Map 映射，避免 N+1
+3. **前端设计规范**：所有前端页面使用 ui-ux-pro-max 技能包设计
+4. **系统消息**：群管理操作产生的系统消息统一使用 type=10（MessageTypeSystem），内容格式化
+5. **权限层级**：群主(2) > 管理员(1) > 成员(0)，操作时必须校验层级
+6. **Wire 依赖**：Phase 2b 中 Wire 有过手动 patch 历史，注意检查 wire_gen.go 一致性
+7. **依赖管理**：当前 Go 版本 1.23.12，添加新依赖必须选择兼容版本
--- a/docs/progress/CURRENT_STATUS.md
+++ b/docs/progress/CURRENT_STATUS.md
@@ -1,8 +1,8 @@
 # EchoChat 项目开发进度

-> **最后更新**：2026-03-04（Phase 2c 设计完成，待实施）
-> **当前阶段**：Phase 2c 设计完成，准备开始实施
-> **当前分支**：`feature/phase2c-group-read-receipt`（已从 phase2b 拉出）
+> **最后更新**：2026-03-04（Phase 2c 代码审查修复完成）
+> **当前阶段**：Phase 2c 代码审查修复完成，待最终验证
+> **当前分支**：`feature/phase2c-group-read-receipt`
 > **实施计划**：`docs/plans/2026-03-04-phase2c-implementation.plan.md`
 > **设计文档**：`docs/plans/2026-03-04-phase2c-design.md`

@@ -178,14 +178,24 @@ EchoChat/
 │   └── router/router.go
 ├── frontend/                    # 前台（uni-app）
 │   └── src/
-│       ├── api/{auth,contact,user,im}.js
+│       ├── api/{auth,contact,user,im,group,file}.js
+│       ├── constants/group.js    # [Phase 2c] 群聊角色/状态常量
 │       ├── services/websocket.js
-│       ├── store/{user,websocket,contact,chat}.js
-│       ├── pages/chat/          # [Phase 2b] 4 个页面
-│       │   ├── index.vue        # 会话列表
-│       │   ├── conversation.vue # 聊天对话
+│       ├── store/{user,websocket,contact,chat,group}.js
+│       ├── pages/chat/          # [Phase 2b] 5 个页面
+│       │   ├── index.vue        # 会话列表（含群聊 Tab）
+│       │   ├── conversation.vue # 单聊对话
+│       │   ├── read-detail.vue  # [Phase 2c] 已读详情
 │       │   ├── settings.vue     # 聊天设置
 │       │   └── search.vue       # 消息搜索
+│       ├── pages/group/         # [Phase 2c] 7 个页面
+│       │   ├── conversation.vue # 群聊对话（含 @选择器 + 已读计数 + 禁言提示）
+│       │   ├── create.vue       # 创建群聊
+│       │   ├── settings.vue     # 群设置
+│       │   ├── members.vue      # 成员管理
+│       │   ├── invite.vue       # 邀请入群
+│       │   ├── join-requests.vue # 入群审批
+│       │   └── search.vue       # 搜索群聊
 │       ├── pages/contact/       # [Phase 2a] 6 个页面
 │       └── components/CustomTabBar.vue（含 badge）
 ├── admin/                       # 管理端（Vue 3 + Element Plus）
@@ -237,12 +247,12 @@ cd frontend && npm run dev:h5

 ---

-## 八、下一阶段：Phase 2c — 群聊与已读回执
+## 八、Phase 2c — 群聊与已读回执

-> **状态：** 设计完成，待实施
+> **状态：** 实施中
 > **设计文档：** `docs/plans/2026-03-04-phase2c-design.md`
 > **实施计划：** `docs/plans/2026-03-04-phase2c-implementation.plan.md`
-> **分支：** `feature/phase2c-group-read-receipt`（已创建，从 phase2b 拉出）
+> **分支：** `feature/phase2c-group-read-receipt`

 ### 功能范围

@@ -252,29 +262,84 @@ cd frontend && npm run dev:h5
 | 群消息 | 复用 im.message.* 事件 + @某人/@所有人 + 管理员撤回（无时限）+ 系统消息 |
 | 已读回执 | 单聊会话级（last_read_msg_id）+ 群聊消息级（im_message_reads 表）+ 实时推送 |
 | MinIO | Docker 容器 + Go SDK + 通用上传 API（群头像） |
-| 管理端 | 群列表/群详情/解散群/移除成员 |
+| 管理端 | 群列表/群详情/解散群 |
 | 前端 | 9 个新页面 + 群聊 Store + 会话列表 Tab 改造 |

-### Task 概览（14 个）
+### Task 完成状态

 | Task | 描述 | 状态 |
 |------|------|------|
-| Task 0 | MinIO Docker + SDK + 通用上传 API | 📋 |
-| Task 1 | 数据库迁移 + Model + 常量 | 📋 |
-| Task 2 | Group DAO 层 | 📋 |
-| Task 3 | Group Service 业务逻辑 | 📋 |
-| Task 4 | Group Controller + Router + Wire | 📋 |
-| Task 5 | WS 群管理事件处理器 | 📋 |
-| Task 6 | IM Service 扩展（群消息/@提醒/管理员撤回） | 📋 |
-| Task 7 | 已读回执后端 | 📋 |
-| Task 8 | 前端已读回执 UI | 📋 |
-| Task 9 | 前端群聊 Store + API + WS 监听 | 📋 |
-| Task 10 | 群聊核心页面（Tab + 对话 + 创建） | 📋 |
-| Task 11 | 群聊管理页面（设置 + 成员 + 邀请 + @选择器） | 📋 |
-| Task 12 | 群聊辅助功能（审批 + 搜索 + 免打扰 + 公告） | 📋 |
-| Task 13 | 管理端 + 文档更新 + 代码审查 | 📋 |
+| Task 0 | MinIO Docker + SDK + 通用上传 API | ✅ 完成 |
+| Task 1 | 数据库迁移 + Model + 常量 | ✅ 完成 |
+| Task 2 | Group DAO 层 | ✅ 完成 |
+| Task 3 | Group Service 业务逻辑 + WS 推送 | ✅ 完成 |
+| Task 4 | Group Controller + Router + Wire | ✅ 完成 |
+| Task 5 | IM Service 扩展（群消息/@提醒/管理员撤回） | ✅ 完成 |
+| Task 6 | 已读回执后端（单聊 + 群聊） | ✅ 完成 |
+| Task 7 | 代码审查修复（Critical 4 项 + Important 4 项） | ✅ 完成 |
+| Task 8 | 前端已读回执 UI（单聊标记 + 群聊计数 + 详情页） | ✅ 完成 |
+| Task 9 | 前端群聊 Store + API 封装 + WS 事件监听 | ✅ 完成 |
+| Task 10 | 群聊核心页面（Tab 切换 + 群聊对话页 + 创建群聊页） | ✅ 完成 |
+| Task 11 | 群聊管理页面（群设置 + 成员管理 + 邀请入群） | ✅ 完成 |
+| Task 12 | 群聊辅助功能（入群审批 + 搜索群聊） | ✅ 完成 |
+| Task 13 | 管理端群组管理 + 文档更新 | ✅ 完成 |
+| 代码审查修复 | 14 项修复（Critical×5 + Important×4 + Minor×2 + Suggestion×3） | ✅ 完成 |
+
+### 代码审查修复详情（Phase 2c）
+
+| # | 优先级 | 修复内容 |
+|---|--------|----------|
+| Fix C1 | Critical | conversation.vue 角色类型不匹配：字符串改为 GROUP_ROLE 数字常量 |
+| Fix C2 | Critical | settings.vue 群公告字段名 announcement 改为 notice（对齐后端 DTO） |
+| Fix C3 | Critical | chat.js sendMessage 未传递 at_user_ids 到 WS payload |
+| Fix C4 | Critical | create.vue 创建成功后导航错误：改为 /pages/group/conversation + 正确参数 |
+| Fix C5 | Critical | admin/provider.go Wire Set 未注册 GroupManageService/Controller |
+| Fix I1 | Important | store/group.js searchGroups 添加 append 参数解决分页加载竞态 |
+| Fix I2 | Important | settings.vue 改为 fetchMembers() 刷新数据，不直接修改 computed 引用 |
+| Fix I3 | Important | 新增 constants/group.js 前端角色常量定义，消除魔数 |
+| Fix I4 | Important | group_manage_service.go 列表查询 N+1 优化：批量查询用户名和成员数 |
+| Fix M1 | Minor | file.js JSON.parse 添加 try/catch 异常保护 |
+| Fix M2 | Minor | conversation.vue isSelf 移除冗余临时状态条件 |
+| Fix S1 | Suggestion | 群聊对话页新增禁言状态检测和输入栏禁用提示 |
+| Fix S2 | Suggestion | join-requests.vue 注册 WS group.join.request 事件实时刷新 |
+| Fix S3 | Suggestion | read-detail.vue 获取失败时添加 uni.showToast 用户提示 |
+
+### Phase 2c 新增内容
+
+#### 后端新增模块
+- **file/** — 文件上传（MinIO SDK + 通用上传 API）
+- **group/** — 群聊管理（Controller + Service + DAO + Model + Router）
+  - 18 个群管理 REST API + 11 个 WS 群事件推送
+- **im/ 扩展** — 群消息发送/撤回 + @提醒 + 单聊/群聊已读回执
+- **admin/ 扩展** — 群组列表 + 群组详情 + 解散群聊
+
+#### 前端新增页面（9 个）
+| 页面 | 路径 | 功能 |
+|------|------|------|
+| 群聊对话页 | `pages/group/conversation.vue` | 群消息收发 + @选择器 + 已读计数 |
+| 创建群聊页 | `pages/group/create.vue` | 好友多选 + 群名称输入 |
+| 群设置页 | `pages/group/settings.vue` | 群信息修改 + 成员概览 + 退出/解散 |
+| 群成员页 | `pages/group/members.vue` | 成员列表 + 角色管理 + 禁言操作 |
+| 邀请入群页 | `pages/group/invite.vue` | 好友多选 + 排除已在群内成员 |
+| 入群审批页 | `pages/group/join-requests.vue` | 申请列表 + 通过/拒绝操作 |
+| 搜索群聊页 | `pages/group/search.vue` | 关键词搜索 + 申请加入 |
+| 已读详情页 | `pages/chat/read-detail.vue` | 已读/未读成员列表（群聊消息级） |
+| 会话列表改造 | `pages/chat/index.vue` | Tab 切换（全部/单聊/群聊）+ @标记 + 免打扰标识 |
+
+#### 管理端新增
+| 页面 | 路径 | 功能 |
+|------|------|------|
+| 群组列表 | `views/group/list.vue` | 搜索 + 分页 + 详情弹窗 + 解散群聊 |
+
+#### 数据库新增/变更
+- `im_groups` — 群信息表（新增）
+- `im_group_join_requests` — 入群申请表（新增）
+- `im_message_reads` — 群消息已读表（新增）
+- `im_conversation_members` — 扩展字段（role, nickname, is_muted, is_do_not_disturb, joined_at, at_me_count）
+- `im_messages` — 扩展字段（at_user_ids BIGINT[]）

 ### 留待后续阶段

 - 消息类型扩展（图片/语音/文件）
 - 管理端消息管理功能
+- 群头像上传 UI 完善
--- a/frontend/src/App.vue
+++ b/frontend/src/App.vue
@@ -10,6 +10,7 @@ import { useUserStore } from '@/store/user'
 import { useWebSocketStore } from '@/store/websocket'
 import { useChatStore } from '@/store/chat'
 import { useContactStore } from '@/store/contact'
+import { useGroupStore } from '@/store/group'

 export default {
  onLaunch() {
@@ -35,8 +36,10 @@ export default {
      wsStore.connect()
      const chatStore = useChatStore()
      const contactStore = useContactStore()
+      const groupStore = useGroupStore()
      chatStore.initWsListeners()
      contactStore.initWsListeners()
+      groupStore.initWsListeners()
    }
  }
 }
--- a/frontend/src/api/file.js
+++ b/frontend/src/api/file.js
@@ -0,0 +1,55 @@
+/**
+ * 文件上传模块 API
+ *
+ * 对应后端路由：POST /api/v1/upload
+ * 使用 uni.uploadFile 上传文件到 MinIO
+ */
+
+import { BASE_URL } from '@/utils/request'
+import { getToken } from '@/utils/storage'
+
+/**
+ * 上传文件
+ * @param {string} filePath - 本地文件路径（如从 uni.chooseImage 获取）
+ * @returns {Promise<Object>} 返回 { url: '...' }
+ */
+const uploadFile = (filePath) => {
+  return new Promise((resolve, reject) => {
+    const token = getToken()
+    uni.uploadFile({
+      url: `${BASE_URL}/api/v1/upload`,
+      filePath,
+      name: 'file',
+      header: {
+        Authorization: token ? `Bearer ${token}` : ''
+      },
+      success: (res) => {
+        if (res.statusCode === 200) {
+          try {
+            const data = JSON.parse(res.data)
+            if (data.code === 0) {
+              resolve(data)
+            } else {
+              uni.showToast({ title: data.message || '上传失败', icon: 'none' })
+              reject(data)
+            }
+          } catch {
+            uni.showToast({ title: '响应解析失败', icon: 'none' })
+            reject({ code: -1, message: '响应解析失败' })
+          }
+        } else {
+          uni.showToast({ title: '上传失败', icon: 'none' })
+          reject({ code: res.statusCode, message: '上传失败' })
+        }
+      },
+      fail: (err) => {
+        uni.showToast({ title: '网络异常', icon: 'none' })
+        reject({ code: -1, message: err.errMsg || '网络异常' })
+      }
+    })
+  })
+}
+
+export default {
+  uploadFile
+}
--- a/frontend/src/api/group.js
+++ b/frontend/src/api/group.js
@@ -0,0 +1,119 @@
+/**
+ * 群聊模块 API
+ *
+ * 对应后端路由：/api/v1/groups/*
+ * 群消息发送/撤回通过 WebSocket 进行，此处仅包含 REST API
+ */
+
+import { get, post, put, del } from '@/utils/request'
+
+/** 创建群聊 */
+const createGroup = (name, memberIds, avatar = '') => {
+  return post('/api/v1/groups', { name, member_ids: memberIds, avatar })
+}
+
+/** 获取群详情 */
+const getGroupDetail = (groupId) => {
+  return get(`/api/v1/groups/${groupId}`)
+}
+
+/** 更新群信息（名称/头像/公告/可搜索性） */
+const updateGroup = (groupId, data) => {
+  return put(`/api/v1/groups/${groupId}`, data)
+}
+
+/** 解散群聊 */
+const dissolveGroup = (groupId) => {
+  return del(`/api/v1/groups/${groupId}`)
+}
+
+/** 获取群成员列表 */
+const getMembers = (groupId) => {
+  return get(`/api/v1/groups/${groupId}/members`)
+}
+
+/** 邀请用户入群 */
+const inviteMembers = (groupId, userIds) => {
+  return post(`/api/v1/groups/${groupId}/members`, { user_ids: userIds })
+}
+
+/** 踢出群成员 */
+const kickMember = (groupId, userId) => {
+  return del(`/api/v1/groups/${groupId}/members/${userId}`)
+}
+
+/** 退出群聊 */
+const leaveGroup = (groupId) => {
+  return del(`/api/v1/groups/${groupId}/members/me`)
+}
+
+/** 转让群主 */
+const transferOwner = (groupId, newOwnerId) => {
+  return put(`/api/v1/groups/${groupId}/transfer`, { new_owner_id: newOwnerId })
+}
+
+/** 设置/取消管理员 */
+const setMemberRole = (groupId, userId, role) => {
+  return put(`/api/v1/groups/${groupId}/members/${userId}/role`, { role })
+}
+
+/** 禁言/解除禁言成员 */
+const muteMember = (groupId, userId, isMuted) => {
+  return put(`/api/v1/groups/${groupId}/members/${userId}/mute`, { is_muted: isMuted })
+}
+
+/** 设置/取消全体禁言 */
+const setAllMuted = (groupId, isMuted) => {
+  return put(`/api/v1/groups/${groupId}/mute`, { is_muted: isMuted })
+}
+
+/** 修改群内昵称 */
+const updateNickname = (groupId, nickname) => {
+  return put(`/api/v1/groups/${groupId}/members/me/nickname`, { nickname })
+}
+
+/** 提交入群申请 */
+const submitJoinRequest = (groupId, message = '') => {
+  return post(`/api/v1/groups/${groupId}/join-requests`, { message })
+}
+
+/** 获取入群申请列表（群主/管理员） */
+const getJoinRequests = (groupId) => {
+  return get(`/api/v1/groups/${groupId}/join-requests`)
+}
+
+/** 审批入群申请 */
+const reviewJoinRequest = (groupId, requestId, action) => {
+  return put(`/api/v1/groups/${groupId}/join-requests/${requestId}`, { action })
+}
+
+/** 搜索公开群 */
+const searchGroups = (keyword, page = 1, pageSize = 20) => {
+  return get('/api/v1/groups/search', { keyword, page, page_size: pageSize })
+}
+
+/** 设置/取消免打扰 */
+const setDoNotDisturb = (conversationId, isDoNotDisturb) => {
+  return put(`/api/v1/im/conversations/${conversationId}/dnd`, { is_do_not_disturb: isDoNotDisturb })
+}
+
+export default {
+  createGroup,
+  getGroupDetail,
+  updateGroup,
+  dissolveGroup,
+  getMembers,
+  inviteMembers,
+  kickMember,
+  leaveGroup,
+  transferOwner,
+  setMemberRole,
+  muteMember,
+  setAllMuted,
+  updateNickname,
+  submitJoinRequest,
+  getJoinRequests,
+  reviewJoinRequest,
+  searchGroups,
+  setDoNotDisturb
+}
--- a/frontend/src/api/im.js
+++ b/frontend/src/api/im.js
@@ -46,6 +46,11 @@ const getTotalUnread = () => {
  return get('/api/v1/im/unread')
 }

+/** 获取消息已读详情（已读/未读用户列表） */
+const getMessageReadDetail = (messageId, page = 1, pageSize = 50) => {
+  return get(`/api/v1/im/messages/${messageId}/reads`, { page, page_size: pageSize })
+}
+
 export default {
  getConversations,
  getHistoryMessages,
@@ -53,5 +58,6 @@ export default {
  deleteConversation,
  clearHistory,
  searchMessages,
-  getTotalUnread
+  getTotalUnread,
+  getMessageReadDetail
 }
--- a/frontend/src/constants/group.js
+++ b/frontend/src/constants/group.js
@@ -0,0 +1,35 @@
+/**
+ * 群聊相关常量定义
+ *
+ * 与后端 constants/group.go 保持一致：
+ * - GroupRoleNormal = 0（普通成员）
+ * - GroupRoleAdmin  = 1（管理员）
+ * - GroupRoleOwner  = 2（群主）
+ */
+
+/** 群成员角色（im_conversation_members.role） */
+export const GROUP_ROLE = {
+  MEMBER: 0,
+  ADMIN: 1,
+  OWNER: 2
+}
+
+/** 群成员角色中文映射 */
+export const GROUP_ROLE_LABEL = {
+  [GROUP_ROLE.MEMBER]: '普通成员',
+  [GROUP_ROLE.ADMIN]: '管理员',
+  [GROUP_ROLE.OWNER]: '群主'
+}
+
+/** 群聊状态 */
+export const GROUP_STATUS = {
+  NORMAL: 1,
+  DISSOLVED: 2
+}
+
+/** 入群申请状态 */
+export const JOIN_REQUEST_STATUS = {
+  PENDING: 0,
+  APPROVED: 1,
+  REJECTED: 2
+}
--- a/frontend/src/pages.json
+++ b/frontend/src/pages.json
@@ -87,6 +87,55 @@
 				"navigationBarTitleText": "搜索消息"
 			}
 		},
+		{
+			"path": "pages/chat/read-detail",
+			"style": {
+				"navigationBarTitleText": "已读详情"
+			}
+		},
+		{
+			"path": "pages/group/conversation",
+			"style": {
+				"navigationBarTitleText": "群聊",
+				"navigationStyle": "custom"
+			}
+		},
+		{
+			"path": "pages/group/create",
+			"style": {
+				"navigationBarTitleText": "创建群聊"
+			}
+		},
+		{
+			"path": "pages/group/settings",
+			"style": {
+				"navigationBarTitleText": "群设置"
+			}
+		},
+		{
+			"path": "pages/group/members",
+			"style": {
+				"navigationBarTitleText": "群成员"
+			}
+		},
+		{
+			"path": "pages/group/invite",
+			"style": {
+				"navigationBarTitleText": "邀请入群"
+			}
+		},
+		{
+			"path": "pages/group/join-requests",
+			"style": {
+				"navigationBarTitleText": "入群申请"
+			}
+		},
+		{
+			"path": "pages/group/search",
+			"style": {
+				"navigationBarTitleText": "搜索群聊"
+			}
+		},
 		{
 			"path": "pages/meeting/index",
 			"style": {
--- a/frontend/src/pages/chat/conversation.vue
+++ b/frontend/src/pages/chat/conversation.vue
@@ -61,6 +61,8 @@

        <!-- ====== 自己消息（右侧）：[状态] [气泡] [头像] ====== -->
        <template v-else>
+          <view class="self-msg-col">
+            <view class="self-msg-row">
              <view v-if="msg._sending" class="msg-status">
                <uni-icons type="loop" size="16" color="#94A3B8" />
              </view>
@@ -81,6 +83,11 @@
                  <text class="avatar-char">{{ (selfName || '我')[0] }}</text>
                </view>
              </view>
+            </view>
+            <text v-if="getReadLabel(msg)" class="read-label" :class="isRead(msg) ? 'read-label-read' : 'read-label-unread'">
+              {{ getReadLabel(msg) }}
+            </text>
+          </view>
        </template>
      </view>

@@ -134,11 +141,29 @@ export default {
    const selfAvatar = computed(() => userStore.userInfo?.avatar || '')
    const selfName = computed(() => userStore.userInfo?.nickname || userStore.userInfo?.username || '我')

+    const convType = ref(1)
+
    const isSelf = (msg) => {
      const myId = Number(userStore.userInfo?.id) || 0
      return msg.sender_id === myId || msg._sending === true || msg._failed === true
    }

+    const isRead = (msg) => {
+      if (convType.value === 2) return false
+      if (msg.status === 2 || msg._sending || msg._failed || !msg.id) return false
+      const lastReadId = chatStore.readStatusMap[conversationId.value] || 0
+      return msg.id <= lastReadId
+    }
+
+    const getReadLabel = (msg) => {
+      if (msg.status === 2 || msg._sending || msg._failed || !msg.id) return ''
+      if (convType.value === 2) {
+        const count = chatStore.groupReadCountMap[msg.id]
+        return count > 0 ? `${count}人已读` : ''
+      }
+      return isRead(msg) ? '已读' : '未读'
+    }
+
    const tryFindExistingConversation = async () => {
      try {
        await chatStore.fetchConversations()
@@ -158,6 +183,7 @@ export default {
      peerId.value = parseInt(query.peerId) || 0
      peerName.value = decodeURIComponent(query.peerName || '')
      peerAvatar.value = decodeURIComponent(query.peerAvatar || '')
+      convType.value = parseInt(query.convType) || 1

      chatStore.initWsListeners()

@@ -265,9 +291,10 @@ export default {

    return {
      peerName, peerAvatar, selfAvatar, selfName,
-      inputText, scrollToId, loadingMore,
+      inputText, scrollToId, loadingMore, convType,
      messages, hasMore, isTyping,
-      isSelf, onSend, onInputChange, onLoadMore,
+      isSelf, isRead, getReadLabel,
+      onSend, onInputChange, onLoadMore,
      onMsgLongPress, onResend, goBack, goToSettings
    }
  }
@@ -376,6 +403,25 @@ export default {
 .msg-text-self { color: #FFFFFF; }
 .recalled-text { font-size: 24rpx; color: #94A3B8; font-style: italic; }

+/* ===== 自己消息布局（含已读标记） ===== */
+.self-msg-col {
+  display: flex;
+  flex-direction: column;
+  align-items: flex-end;
+}
+.self-msg-row {
+  display: flex;
+  align-items: flex-start;
+  justify-content: flex-end;
+}
+.read-label {
+  font-size: 20rpx;
+  margin-top: 4rpx;
+  margin-right: 88rpx;
+}
+.read-label-read { color: #2563EB; }
+.read-label-unread { color: #94A3B8; }
+
 /* ===== 发送状态 ===== */
 .msg-status {
  display: flex;
--- a/frontend/src/pages/chat/index.vue
+++ b/frontend/src/pages/chat/index.vue
@@ -15,6 +15,22 @@
        <view class="action-btn" @tap="goToSearch">
          <uni-icons type="search" size="20" color="#475569" />
        </view>
+        <view class="action-btn" @tap="goToCreateGroup">
+          <uni-icons type="plusempty" size="20" color="#475569" />
+        </view>
+      </view>
+    </view>
+
+    <!-- Tab 筛选栏 -->
+    <view class="tab-filter">
+      <view class="tab-item" :class="{ 'tab-active': activeTab === 'all' }" @tap="activeTab = 'all'">
+        <text class="tab-text">全部</text>
+      </view>
+      <view class="tab-item" :class="{ 'tab-active': activeTab === 'private' }" @tap="activeTab = 'private'">
+        <text class="tab-text">单聊</text>
+      </view>
+      <view class="tab-item" :class="{ 'tab-active': activeTab === 'group' }" @tap="activeTab = 'group'">
+        <text class="tab-text">群聊</text>
      </view>
    </view>

@@ -47,7 +63,7 @@
          <view v-else class="conv-avatar conv-avatar-placeholder">
            <text class="avatar-text">{{ (conv.peer_nickname || '?')[0] }}</text>
          </view>
-          <view v-if="conv.unread_count > 0" class="conv-badge">
+          <view v-if="conv.unread_count > 0" class="conv-badge" :class="{ 'conv-badge-mute': conv.is_do_not_disturb }">
            <text class="conv-badge-text">{{ conv.unread_count > 99 ? '99+' : conv.unread_count }}</text>
          </view>
        </view>
@@ -60,9 +76,13 @@
          </view>
          <view class="conv-bottom">
            <text v-if="isTyping(conv.id)" class="conv-typing">对方正在输入...</text>
-            <text v-else class="conv-preview" :class="{ 'conv-preview-unread': conv.unread_count > 0 }">
+            <view v-else class="conv-preview-row">
+              <text v-if="conv.at_me_count > 0" class="conv-at-tag">[{{ conv.at_me_count }}条] @了我</text>
+              <text v-if="conv.is_do_not_disturb" class="conv-dnd-icon">🔕</text>
+              <text class="conv-preview" :class="{ 'conv-preview-unread': conv.unread_count > 0 }">
                {{ conv.last_msg_content || ' ' }}
              </text>
+            </view>
            <view v-if="conv.is_pinned" class="conv-pin-tag">
              <uni-icons type="top" size="14" color="#94A3B8" />
            </view>
@@ -87,8 +107,14 @@ export default {
  setup() {
    const chatStore = useChatStore()
    const loading = ref(false)
+    const activeTab = ref('all')

-    const conversations = computed(() => chatStore.sortedConversations)
+    const conversations = computed(() => {
+      const all = chatStore.sortedConversations
+      if (activeTab.value === 'private') return all.filter(c => c.type === 1)
+      if (activeTab.value === 'group') return all.filter(c => c.type === 2)
+      return all
+    })

    const loadData = async () => {
      loading.value = true
@@ -105,15 +131,25 @@ export default {
    })

    const openChat = (conv) => {
+      if (conv.type === 2) {
        uni.navigateTo({
-        url: `/pages/chat/conversation?conversationId=${conv.id}&peerId=${conv.peer_user_id}&peerName=${encodeURIComponent(conv.peer_nickname || '')}&peerAvatar=${encodeURIComponent(conv.peer_avatar || '')}`
+          url: `/pages/group/conversation?conversationId=${conv.id}&groupId=${conv.group_id || 0}&peerName=${encodeURIComponent(conv.peer_nickname || '')}&peerAvatar=${encodeURIComponent(conv.peer_avatar || '')}`
        })
+      } else {
+        uni.navigateTo({
+          url: `/pages/chat/conversation?conversationId=${conv.id}&peerId=${conv.peer_user_id}&peerName=${encodeURIComponent(conv.peer_nickname || '')}&peerAvatar=${encodeURIComponent(conv.peer_avatar || '')}&convType=1`
+        })
+      }
    }

    const goToSearch = () => {
      uni.navigateTo({ url: '/pages/chat/search' })
    }

+    const goToCreateGroup = () => {
+      uni.navigateTo({ url: '/pages/group/create' })
+    }
+
    const isTyping = (convId) => {
      return chatStore.typingMap[convId] || false
    }
@@ -160,9 +196,11 @@ export default {

    return {
      loading,
+      activeTab,
      conversations,
      openChat,
      goToSearch,
+      goToCreateGroup,
      isTyping,
      formatTime,
      onLongPress,
@@ -215,9 +253,25 @@ export default {
  background-color: #E2E8F0;
 }

+/* Tab 筛选栏 */
+.tab-filter {
+  display: flex;
+  padding: 0 32rpx;
+  background-color: #FFFFFF;
+  border-bottom: 1rpx solid #E2E8F0;
+}
+.tab-item {
+  padding: 16rpx 24rpx;
+  margin-right: 8rpx;
+  position: relative;
+}
+.tab-active { border-bottom: 4rpx solid #2563EB; }
+.tab-text { font-size: 26rpx; color: #475569; }
+.tab-active .tab-text { color: #2563EB; font-weight: 600; }
+
 /* 会话列表 */
 .conv-list {
-  height: calc(100vh - 88rpx - var(--status-bar-height, 44px) - 120rpx);
+  height: calc(100vh - 88rpx - var(--status-bar-height, 44px) - 120rpx - 72rpx);
 }

 .conv-item {
@@ -336,6 +390,31 @@ export default {
  font-weight: 500;
 }

+.conv-preview-row {
+  display: flex;
+  align-items: center;
+  overflow: hidden;
+  flex: 1;
+}
+
+.conv-at-tag {
+  font-size: 22rpx;
+  color: #EF4444;
+  font-weight: 600;
+  margin-right: 8rpx;
+  flex-shrink: 0;
+}
+
+.conv-dnd-icon {
+  font-size: 22rpx;
+  margin-right: 4rpx;
+  flex-shrink: 0;
+}
+
+.conv-badge-mute {
+  background-color: #94A3B8;
+}
+
 .conv-typing {
  font-size: 26rpx;
  color: #2563EB;
--- a/frontend/src/pages/chat/read-detail.vue
+++ b/frontend/src/pages/chat/read-detail.vue
@@ -0,0 +1,173 @@
+<!--
+  已读详情页
+
+  展示群消息的已读/未读用户列表
+  Tab 切换：已读 / 未读
+-->
+<template>
+  <view class="page-wrapper">
+    <!-- Tab 切换 -->
+    <view class="tab-bar">
+      <view
+        class="tab-item"
+        :class="{ 'tab-active': activeTab === 'read' }"
+        @tap="activeTab = 'read'"
+      >
+        <text class="tab-text">已读 ({{ readCount }})</text>
+      </view>
+      <view
+        class="tab-item"
+        :class="{ 'tab-active': activeTab === 'unread' }"
+        @tap="activeTab = 'unread'"
+      >
+        <text class="tab-text">未读 ({{ unreadCount }})</text>
+      </view>
+    </view>
+
+    <!-- 用户列表 -->
+    <scroll-view scroll-y class="user-list">
+      <view v-if="loading" class="empty-state">
+        <text class="empty-text">加载中...</text>
+      </view>
+      <view v-else-if="displayList.length === 0" class="empty-state">
+        <text class="empty-text">暂无数据</text>
+      </view>
+      <view
+        v-for="user in displayList"
+        :key="user.user_id"
+        class="user-item"
+      >
+        <view class="user-avatar-wrap">
+          <image v-if="user.user_avatar" class="user-avatar" :src="user.user_avatar" mode="aspectFill" />
+          <view v-else class="user-avatar user-avatar-placeholder">
+            <text class="avatar-char">{{ (user.user_nickname || '?')[0] }}</text>
+          </view>
+        </view>
+        <view class="user-info">
+          <text class="user-name">{{ user.user_nickname || '未知用户' }}</text>
+          <text v-if="user.read_at && activeTab === 'read'" class="user-time">{{ user.read_at }}</text>
+        </view>
+      </view>
+    </scroll-view>
+  </view>
+</template>
+
+<script>
+import { onLoad } from '@dcloudio/uni-app'
+import { ref, computed } from 'vue'
+import imApi from '@/api/im'
+
+export default {
+  name: 'ReadDetail',
+  setup() {
+    const messageId = ref(0)
+    const activeTab = ref('read')
+    const loading = ref(false)
+    const readList = ref([])
+    const unreadList = ref([])
+    const readCount = ref(0)
+    const totalCount = ref(0)
+
+    const unreadCount = computed(() => totalCount.value - readCount.value)
+
+    const displayList = computed(() => {
+      return activeTab.value === 'read' ? readList.value : unreadList.value
+    })
+
+    const fetchReadDetail = async () => {
+      if (!messageId.value) return
+      loading.value = true
+      try {
+        const res = await imApi.getMessageReadDetail(messageId.value)
+        if (res.data) {
+          readList.value = res.data.read_list || []
+          unreadList.value = res.data.unread_list || []
+          readCount.value = res.data.read_count || 0
+          totalCount.value = res.data.total_count || 0
+        }
+      } catch (e) {
+        console.warn('[ReadDetail] 获取已读详情失败', e)
+        uni.showToast({ title: e?.data?.message || '获取已读详情失败', icon: 'none' })
+      } finally {
+        loading.value = false
+      }
+    }
+
+    onLoad((query) => {
+      messageId.value = parseInt(query.messageId) || 0
+      fetchReadDetail()
+    })
+
+    return {
+      activeTab, loading, readCount, unreadCount,
+      displayList
+    }
+  }
+}
+</script>
+
+<style scoped>
+.page-wrapper {
+  height: 100vh;
+  display: flex;
+  flex-direction: column;
+  background-color: #F8FAFC;
+}
+
+/* Tab 切换 */
+.tab-bar {
+  display: flex;
+  background-color: #FFFFFF;
+  border-bottom: 1rpx solid #E2E8F0;
+}
+.tab-item {
+  flex: 1;
+  text-align: center;
+  padding: 24rpx 0;
+  position: relative;
+}
+.tab-active {
+  border-bottom: 4rpx solid #2563EB;
+}
+.tab-text {
+  font-size: 28rpx;
+  color: #475569;
+}
+.tab-active .tab-text {
+  color: #2563EB;
+  font-weight: 600;
+}
+
+/* 用户列表 */
+.user-list {
+  flex: 1;
+  height: 0;
+}
+.user-item {
+  display: flex;
+  align-items: center;
+  padding: 24rpx 32rpx;
+  background-color: #FFFFFF;
+  border-bottom: 1rpx solid #F1F5F9;
+}
+.user-avatar-wrap { flex-shrink: 0; margin-right: 20rpx; }
+.user-avatar {
+  width: 72rpx;
+  height: 72rpx;
+  border-radius: 18rpx;
+}
+.user-avatar-placeholder {
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  background-color: #2563EB;
+}
+.avatar-char { color: #FFFFFF; font-size: 28rpx; font-weight: 600; }
+.user-info { flex: 1; }
+.user-name { font-size: 28rpx; color: #1E293B; }
+.user-time { display: block; font-size: 22rpx; color: #94A3B8; margin-top: 4rpx; }
+
+/* 空状态 */
+.empty-state { padding: 80rpx 0; text-align: center; }
+.empty-text { font-size: 28rpx; color: #94A3B8; }
+</style>
--- a/frontend/src/pages/group/conversation.vue
+++ b/frontend/src/pages/group/conversation.vue
@@ -0,0 +1,736 @@
+<!--
+  群聊对话页
+
+  布局规则：
+  - 自己的消息：靠右对齐，顺序 [状态图标] [蓝色气泡] [自己头像]
+  - 他人的消息：靠左对齐，顺序 [头像] [昵称 + 白色气泡]
+  - 系统消息（type === 10）：居中灰色文字，无头像无气泡
+  - 导航栏：返回 / 群名称 / 群设置入口
+-->
+<template>
+  <view class="page-wrapper">
+    <!-- 导航栏 -->
+    <view class="nav-bar">
+      <view class="nav-left" @tap="goBack">
+        <uni-icons type="back" size="20" color="#1E293B" />
+      </view>
+      <view class="nav-center">
+        <text class="nav-title">{{ groupName || '群聊' }}</text>
+        <text v-if="memberCount" class="nav-subtitle">({{ memberCount }})</text>
+      </view>
+      <view class="nav-right" @tap="goToSettings">
+        <uni-icons type="more-filled" size="20" color="#475569" />
+      </view>
+    </view>
+
+    <!-- 消息列表 -->
+    <scroll-view
+      scroll-y
+      class="msg-list"
+      :scroll-into-view="scrollToId"
+      :scroll-with-animation="true"
+      @scrolltoupper="onLoadMore"
+    >
+      <view v-if="hasMore" class="load-more" @tap="onLoadMore">
+        <text class="load-more-text">{{ loadingMore ? '加载中...' : '加载更多' }}</text>
+      </view>
+
+      <view
+        v-for="msg in messages"
+        :key="msg.client_msg_id || msg.id"
+        :id="'msg-' + (msg.id || msg.client_msg_id)"
+      >
+        <!-- ====== 系统消息（居中灰色文字） ====== -->
+        <view v-if="msg.type === 10 || msg.sender_id === 0" class="msg-row-system">
+          <text class="system-text">{{ msg.content }}</text>
+        </view>
+
+        <!-- ====== 普通消息 ====== -->
+        <view
+          v-else
+          class="msg-row"
+          :class="isSelf(msg) ? 'msg-row-self' : 'msg-row-other'"
+        >
+          <!-- 他人消息（左侧）：[头像] [昵称 + 气泡] -->
+          <template v-if="!isSelf(msg)">
+            <view class="avatar-wrap">
+              <image
+                v-if="getMemberAvatar(msg.sender_id)"
+                class="avatar-img"
+                :src="getMemberAvatar(msg.sender_id)"
+                mode="aspectFill"
+              />
+              <view v-else class="avatar-img avatar-placeholder avatar-peer">
+                <text class="avatar-char">{{ getMemberName(msg.sender_id)[0] || '?' }}</text>
+              </view>
+            </view>
+            <view class="bubble-col">
+              <text class="sender-name">{{ getMemberName(msg.sender_id) }}</text>
+              <view
+                class="bubble bubble-other"
+                :class="{ 'bubble-recalled': msg.status === 2 }"
+                @longpress="onMsgLongPress(msg)"
+              >
+                <text v-if="msg.status === 2" class="recalled-text">消息已撤回</text>
+                <text v-else class="msg-text">{{ msg.content }}</text>
+              </view>
+            </view>
+          </template>
+
+          <!-- 自己消息（右侧）：[状态] [气泡] [头像] -->
+          <template v-else>
+            <view class="self-msg-col">
+              <view class="self-msg-row">
+                <view v-if="msg._sending" class="msg-status">
+                  <uni-icons type="loop" size="16" color="#94A3B8" />
+                </view>
+                <view v-if="msg._failed" class="msg-status msg-status-tap" @tap="onResend(msg)">
+                  <uni-icons type="info-filled" size="18" color="#EF4444" />
+                </view>
+                <view
+                  class="bubble bubble-self"
+                  :class="{ 'bubble-recalled': msg.status === 2 }"
+                  @longpress="onMsgLongPress(msg)"
+                >
+                  <text v-if="msg.status === 2" class="recalled-text">消息已撤回</text>
+                  <text v-else class="msg-text msg-text-self">{{ msg.content }}</text>
+                </view>
+                <view class="avatar-wrap">
+                  <image v-if="selfAvatar" class="avatar-img" :src="selfAvatar" mode="aspectFill" />
+                  <view v-else class="avatar-img avatar-placeholder avatar-self">
+                    <text class="avatar-char">{{ (selfName || '我')[0] }}</text>
+                  </view>
+                </view>
+              </view>
+              <!-- 群聊已读计数 -->
+              <text
+                v-if="getReadLabel(msg)"
+                class="read-label"
+                @tap="goToReadDetail(msg)"
+              >
+                {{ getReadLabel(msg) }}
+              </text>
+            </view>
+          </template>
+        </view>
+      </view>
+
+      <view id="msg-bottom" style="height: 2rpx;" />
+    </scroll-view>
+
+    <!-- @成员选择器 -->
+    <view v-if="showAtPicker" class="at-overlay" @tap="showAtPicker = false">
+      <view class="at-panel" @tap.stop>
+        <view class="at-header">
+          <text class="at-header-text">选择成员</text>
+          <view class="at-close" @tap="showAtPicker = false">
+            <uni-icons type="close" size="18" color="#475569" />
+          </view>
+        </view>
+        <scroll-view scroll-y class="at-member-list">
+          <view class="at-member-item" @tap="onSelectAtMember(null)">
+            <view class="avatar-img avatar-placeholder avatar-all">
+              <text class="avatar-char">@</text>
+            </view>
+            <text class="at-member-name">所有人</text>
+          </view>
+          <view
+            v-for="member in atMemberList"
+            :key="member.user_id"
+            class="at-member-item"
+            @tap="onSelectAtMember(member)"
+          >
+            <image
+              v-if="member.avatar"
+              class="avatar-img at-avatar"
+              :src="member.avatar"
+              mode="aspectFill"
+            />
+            <view v-else class="avatar-img avatar-placeholder avatar-peer at-avatar">
+              <text class="avatar-char">{{ (member.nickname || member.username || '?')[0] }}</text>
+            </view>
+            <text class="at-member-name">{{ member.nickname || member.username }}</text>
+            <text v-if="member.role === GROUP_ROLE.OWNER" class="at-role-tag">群主</text>
+            <text v-else-if="member.role === GROUP_ROLE.ADMIN" class="at-role-tag">管理</text>
+          </view>
+        </scroll-view>
+      </view>
+    </view>
+
+    <!-- 输入栏 -->
+    <view v-if="isMuted" class="input-bar input-bar-muted">
+      <text class="muted-tip">{{ isAllMuted ? '当前群聊已开启全体禁言' : '你已被禁言，无法发送消息' }}</text>
+    </view>
+    <view v-else class="input-bar">
+      <view class="input-wrap">
+        <input
+          class="msg-input"
+          v-model="inputText"
+          placeholder="输入消息..."
+          placeholder-style="color: #94A3B8"
+          confirm-type="send"
+          @confirm="onSend"
+          @input="onInputChange"
+          :adjust-position="true"
+        />
+      </view>
+      <view class="send-btn" :class="{ 'send-btn-active': inputText.trim() }" @tap="onSend">
+        <uni-icons type="paperplane" size="22" color="#FFFFFF" />
+      </view>
+    </view>
+  </view>
+</template>
+
+<script>
+import { onLoad, onUnload } from '@dcloudio/uni-app'
+import { ref, computed, nextTick, watch } from 'vue'
+import { useChatStore } from '@/store/chat'
+import { useGroupStore } from '@/store/group'
+import { useUserStore } from '@/store/user'
+import { GROUP_ROLE } from '@/constants/group'
+
+export default {
+  name: 'GroupConversation',
+  setup() {
+    const chatStore = useChatStore()
+    const groupStore = useGroupStore()
+    const userStore = useUserStore()
+
+    const conversationId = ref(0)
+    const groupId = ref(0)
+    const groupName = ref('')
+    const groupAvatar = ref('')
+    const inputText = ref('')
+    const scrollToId = ref('')
+    const loadingMore = ref(false)
+    const showAtPicker = ref(false)
+    const atUserIds = ref([])
+
+    const messages = computed(() => chatStore.currentMessages)
+    const hasMore = computed(() => chatStore.hasMoreMap[conversationId.value] !== false)
+    const selfAvatar = computed(() => userStore.userInfo?.avatar || '')
+    const selfName = computed(() => userStore.userInfo?.nickname || userStore.userInfo?.username || '我')
+    const myId = computed(() => Number(userStore.userInfo?.id) || 0)
+    const memberCount = computed(() => groupStore.currentMembers.length || 0)
+
+    /** 构建成员 ID → 信息的映射，用于显示发送者昵称 / 头像 */
+    const memberMap = computed(() => {
+      const map = {}
+      for (const m of groupStore.currentMembers) {
+        map[m.user_id] = m
+      }
+      return map
+    })
+
+    /** @选择器中排除自己的成员列表 */
+    const atMemberList = computed(() => {
+      return groupStore.currentMembers.filter(m => m.user_id !== myId.value)
+    })
+
+    /** 当前用户在群中的角色（用于判断撤回权限） */
+    const myRole = computed(() => {
+      const me = memberMap.value[myId.value]
+      return me ? me.role : GROUP_ROLE.MEMBER
+    })
+
+    /** 当前群是否全体禁言 */
+    const isAllMuted = computed(() => {
+      return groupStore.currentGroup?.is_all_muted === true
+    })
+
+    /** 当前用户是否被禁言（个人禁言或全体禁言且非管理员/群主） */
+    const isMuted = computed(() => {
+      const me = memberMap.value[myId.value]
+      if (!me) return false
+      if (me.is_muted) return true
+      if (isAllMuted.value && me.role === GROUP_ROLE.MEMBER) return true
+      return false
+    })
+
+    const isSelf = (msg) => {
+      return msg.sender_id === myId.value
+    }
+
+    const getMemberName = (userId) => {
+      const member = memberMap.value[userId]
+      if (member) return member.nickname || member.username || '未知'
+      return '未知成员'
+    }
+
+    const getMemberAvatar = (userId) => {
+      const member = memberMap.value[userId]
+      return member ? member.avatar : ''
+    }
+
+    /** 群聊已读标签：仅自己的消息显示 "X人已读" */
+    const getReadLabel = (msg) => {
+      if (msg.status === 2 || msg._sending || msg._failed || !msg.id) return ''
+      const count = chatStore.groupReadCountMap[msg.id]
+      return count > 0 ? `${count}人已读` : ''
+    }
+
+    // ==================== 生命周期 ====================
+
+    onLoad((query) => {
+      conversationId.value = parseInt(query.conversationId) || 0
+      groupId.value = parseInt(query.groupId) || 0
+      groupName.value = decodeURIComponent(query.peerName || '')
+      groupAvatar.value = decodeURIComponent(query.peerAvatar || '')
+
+      chatStore.initWsListeners()
+      groupStore.initWsListeners()
+
+      if (conversationId.value) {
+        chatStore.setCurrentConversation(conversationId.value)
+        loadInitialMessages()
+      }
+
+      if (groupId.value) {
+        groupStore.fetchMembers(groupId.value)
+        groupStore.fetchGroupDetail(groupId.value)
+      }
+    })
+
+    onUnload(() => {
+      chatStore.setCurrentConversation(null)
+    })
+
+    watch(() => chatStore.currentConversationId, (newId) => {
+      if (newId && newId !== conversationId.value) {
+        conversationId.value = newId
+      }
+    })
+
+    // ==================== 消息加载 ====================
+
+    const loadInitialMessages = async () => {
+      if (!chatStore.messagesMap[conversationId.value]?.length) {
+        await chatStore.loadHistoryMessages(conversationId.value)
+      }
+      scrollToBottom()
+      markVisibleMessagesRead()
+    }
+
+    const scrollToBottom = () => {
+      nextTick(() => {
+        scrollToId.value = ''
+        nextTick(() => { scrollToId.value = 'msg-bottom' })
+      })
+    }
+
+    /** 标记当前可见消息为已读 */
+    const markVisibleMessagesRead = () => {
+      const msgs = chatStore.messagesMap[conversationId.value] || []
+      const messageIds = msgs.filter(m => m.id && m.sender_id !== myId.value).map(m => m.id)
+      if (messageIds.length > 0) {
+        chatStore.markGroupRead(conversationId.value, messageIds)
+      }
+    }
+
+    // ==================== 消息发送 ====================
+
+    const onSend = () => {
+      const content = inputText.value.trim()
+      if (!content) return
+      chatStore.sendMessage({
+        conversationId: conversationId.value,
+        content,
+        type: 1,
+        at_user_ids: atUserIds.value.length > 0 ? [...atUserIds.value] : undefined
+      })
+      inputText.value = ''
+      atUserIds.value = []
+      scrollToBottom()
+    }
+
+    /** 输入变化检测：输入 @ 时弹出成员选择器 */
+    const onInputChange = (e) => {
+      const val = e.detail.value || inputText.value
+      if (val.endsWith('@')) {
+        showAtPicker.value = true
+      }
+    }
+
+    /** 选择 @成员（null 表示 @所有人） */
+    const onSelectAtMember = (member) => {
+      showAtPicker.value = false
+      if (member === null) {
+        atUserIds.value.push(0)
+        inputText.value = inputText.value + '所有人 '
+      } else {
+        atUserIds.value.push(member.user_id)
+        const name = member.nickname || member.username || ''
+        inputText.value = inputText.value + name + ' '
+      }
+    }
+
+    // ==================== 加载更多 ====================
+
+    const onLoadMore = async () => {
+      if (loadingMore.value || !hasMore.value) return
+      loadingMore.value = true
+      try { await chatStore.loadHistoryMessages(conversationId.value) }
+      finally { loadingMore.value = false }
+    }
+
+    // ==================== 消息撤回 ====================
+
+    /**
+     * 撤回权限判断
+     * - 管理员/群主：可撤回任何人消息，无时间限制
+     * - 普通成员：仅可撤回自己消息，2 分钟内
+     */
+    const canRecall = (msg) => {
+      if (msg.status === 2 || !msg.id) return false
+      const isAdmin = myRole.value === GROUP_ROLE.OWNER || myRole.value === GROUP_ROLE.ADMIN
+      if (isAdmin) return true
+      if (!isSelf(msg)) return false
+      if (!msg.created_at) return false
+      return (Date.now() - new Date(msg.created_at).getTime()) < 2 * 60 * 1000
+    }
+
+    const onMsgLongPress = (msg) => {
+      if (msg.status === 2 || !canRecall(msg)) return
+      uni.showActionSheet({
+        itemList: ['撤回'],
+        success: (res) => {
+          if (res.tapIndex === 0 && msg.id) chatStore.recallMessage(msg.id)
+        }
+      })
+    }
+
+    const onResend = (msg) => {
+      uni.showModal({
+        title: '提示',
+        content: '是否重新发送？',
+        success: (res) => {
+          if (res.confirm) {
+            chatStore.sendMessage({
+              conversationId: conversationId.value,
+              content: msg.content,
+              type: msg.type || 1
+            })
+          }
+        }
+      })
+    }
+
+    // ==================== 导航 ====================
+
+    const goBack = () => {
+      if (getCurrentPages().length > 1) {
+        uni.navigateBack()
+      } else {
+        uni.switchTab({ url: '/pages/chat/index' })
+      }
+    }
+
+    const goToSettings = () => {
+      uni.navigateTo({
+        url: `/pages/group/settings?groupId=${groupId.value}&conversationId=${conversationId.value}&peerName=${encodeURIComponent(groupName.value)}&peerAvatar=${encodeURIComponent(groupAvatar.value)}`
+      })
+    }
+
+    const goToReadDetail = (msg) => {
+      if (!msg.id) return
+      uni.navigateTo({
+        url: `/pages/chat/read-detail?messageId=${msg.id}`
+      })
+    }
+
+    // ==================== 监听新消息到达后标记已读 ====================
+
+    watch(
+      () => messages.value.length,
+      () => {
+        scrollToBottom()
+        markVisibleMessagesRead()
+      }
+    )
+
+    return {
+      GROUP_ROLE,
+      groupName, groupAvatar, selfAvatar, selfName,
+      inputText, scrollToId, loadingMore, memberCount,
+      messages, hasMore, showAtPicker, atMemberList, isMuted, isAllMuted,
+      isSelf, getMemberName, getMemberAvatar, getReadLabel,
+      onSend, onInputChange, onSelectAtMember,
+      onLoadMore, onMsgLongPress, onResend,
+      goBack, goToSettings, goToReadDetail
+    }
+  }
+}
+</script>
+
+<style scoped>
+.page-wrapper {
+  height: 100vh;
+  display: flex;
+  flex-direction: column;
+  background-color: #F1F5F9;
+  overflow: hidden;
+}
+
+/* ===== 导航栏 ===== */
+.nav-bar {
+  display: flex;
+  align-items: center;
+  height: 88rpx;
+  padding: 0 24rpx;
+  padding-top: var(--status-bar-height, 44px);
+  background-color: #FFFFFF;
+  border-bottom: 1rpx solid #E2E8F0;
+}
+.nav-left, .nav-right {
+  min-width: 88rpx;
+  min-height: 88rpx;
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  transition: opacity 150ms ease;
+}
+.nav-left:active, .nav-right:active { opacity: 0.6; }
+.nav-center {
+  flex: 1;
+  display: flex;
+  align-items: baseline;
+  justify-content: center;
+}
+.nav-title { font-size: 32rpx; font-weight: 600; color: #1E293B; }
+.nav-subtitle { font-size: 24rpx; color: #94A3B8; margin-left: 8rpx; }
+
+/* ===== 消息列表 ===== */
+.msg-list {
+  flex: 1;
+  height: 0;
+  min-height: 0;
+  padding: 16rpx 24rpx;
+  box-sizing: border-box;
+  width: 100%;
+  overflow: hidden;
+}
+.load-more { text-align: center; padding: 16rpx 0; }
+.load-more-text { font-size: 24rpx; color: #94A3B8; }
+
+/* ===== 系统消息 ===== */
+.msg-row-system {
+  text-align: center;
+  padding: 16rpx 48rpx;
+  margin-bottom: 24rpx;
+}
+.system-text {
+  font-size: 24rpx;
+  color: #94A3B8;
+  line-height: 36rpx;
+  background-color: rgba(148, 163, 184, 0.12);
+  padding: 8rpx 20rpx;
+  border-radius: 12rpx;
+}
+
+/* ===== 消息行 ===== */
+.msg-row {
+  display: flex;
+  align-items: flex-start;
+  margin-bottom: 24rpx;
+}
+.msg-row-other { justify-content: flex-start; }
+.msg-row-self { justify-content: flex-end; }
+
+/* ===== 头像 ===== */
+.avatar-wrap { flex-shrink: 0; }
+.msg-row-other .avatar-wrap { margin-right: 16rpx; }
+.msg-row-self .avatar-wrap { margin-left: 16rpx; }
+
+.avatar-img {
+  width: 72rpx;
+  height: 72rpx;
+  border-radius: 18rpx;
+}
+.avatar-placeholder {
+  display: flex;
+  align-items: center;
+  justify-content: center;
+}
+.avatar-peer { background-color: #2563EB; }
+.avatar-self { background-color: #64748B; }
+.avatar-all { background-color: #F59E0B; }
+.avatar-char { color: #FFFFFF; font-size: 28rpx; font-weight: 600; }
+
+/* ===== 发送者昵称 + 气泡列 ===== */
+.bubble-col {
+  display: flex;
+  flex-direction: column;
+  max-width: 65vw;
+}
+.sender-name {
+  font-size: 22rpx;
+  color: #94A3B8;
+  margin-bottom: 6rpx;
+  line-height: 30rpx;
+}
+
+/* ===== 气泡 ===== */
+.bubble {
+  max-width: 65vw;
+  padding: 20rpx 24rpx;
+  border-radius: 24rpx;
+  word-break: break-word;
+  overflow-wrap: break-word;
+}
+.bubble-self {
+  background-color: #2563EB;
+  border-bottom-right-radius: 8rpx;
+}
+.bubble-other {
+  background-color: #FFFFFF;
+  border-bottom-left-radius: 8rpx;
+}
+.bubble-recalled {
+  background-color: transparent !important;
+  padding: 8rpx 16rpx;
+}
+
+.msg-text { font-size: 30rpx; line-height: 42rpx; color: #1E293B; }
+.msg-text-self { color: #FFFFFF; }
+.recalled-text { font-size: 24rpx; color: #94A3B8; font-style: italic; }
+
+/* ===== 自己消息布局（含已读标记） ===== */
+.self-msg-col {
+  display: flex;
+  flex-direction: column;
+  align-items: flex-end;
+}
+.self-msg-row {
+  display: flex;
+  align-items: flex-start;
+  justify-content: flex-end;
+}
+.read-label {
+  font-size: 20rpx;
+  margin-top: 4rpx;
+  margin-right: 88rpx;
+  color: #2563EB;
+}
+
+/* ===== 发送状态 ===== */
+.msg-status {
+  display: flex;
+  align-items: center;
+  align-self: center;
+  margin: 0 8rpx;
+}
+.msg-status-tap {
+  min-width: 44rpx;
+  min-height: 44rpx;
+  display: flex;
+  align-items: center;
+  justify-content: center;
+}
+
+/* ===== @成员选择器 ===== */
+.at-overlay {
+  position: fixed;
+  top: 0;
+  left: 0;
+  right: 0;
+  bottom: 0;
+  background-color: rgba(0, 0, 0, 0.35);
+  z-index: 999;
+  display: flex;
+  align-items: flex-end;
+}
+.at-panel {
+  width: 100%;
+  max-height: 60vh;
+  background-color: #FFFFFF;
+  border-radius: 24rpx 24rpx 0 0;
+  display: flex;
+  flex-direction: column;
+  overflow: hidden;
+}
+.at-header {
+  display: flex;
+  align-items: center;
+  justify-content: space-between;
+  padding: 24rpx 32rpx;
+  border-bottom: 1rpx solid #E2E8F0;
+}
+.at-header-text { font-size: 30rpx; font-weight: 600; color: #1E293B; }
+.at-close {
+  min-width: 44rpx;
+  min-height: 44rpx;
+  display: flex;
+  align-items: center;
+  justify-content: center;
+}
+.at-member-list {
+  flex: 1;
+  max-height: 50vh;
+  padding-bottom: env(safe-area-inset-bottom, 0);
+}
+.at-member-item {
+  display: flex;
+  align-items: center;
+  padding: 20rpx 32rpx;
+  transition: background-color 150ms ease;
+}
+.at-member-item:active { background-color: #F8FAFC; }
+.at-avatar { width: 64rpx; height: 64rpx; border-radius: 16rpx; }
+.at-member-name {
+  flex: 1;
+  font-size: 28rpx;
+  color: #1E293B;
+  margin-left: 20rpx;
+}
+.at-role-tag {
+  font-size: 22rpx;
+  color: #2563EB;
+  background-color: rgba(37, 99, 235, 0.08);
+  padding: 4rpx 12rpx;
+  border-radius: 8rpx;
+  margin-left: 12rpx;
+}
+
+/* ===== 输入栏 ===== */
+.input-bar {
+  display: flex;
+  align-items: center;
+  padding: 16rpx 24rpx;
+  padding-bottom: calc(16rpx + env(safe-area-inset-bottom, 0));
+  background-color: #FFFFFF;
+  border-top: 1rpx solid #E2E8F0;
+}
+.input-wrap {
+  flex: 1;
+  background-color: #F1F5F9;
+  border-radius: 36rpx;
+  padding: 0 28rpx;
+  height: 72rpx;
+  display: flex;
+  align-items: center;
+}
+.msg-input { flex: 1; font-size: 28rpx; color: #1E293B; }
+.send-btn {
+  min-width: 72rpx;
+  min-height: 72rpx;
+  margin-left: 16rpx;
+  border-radius: 50%;
+  background-color: #CBD5E1;
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  transition: background-color 200ms ease;
+}
+.send-btn-active { background-color: #2563EB; }
+.send-btn:active { opacity: 0.85; }
+
+/* ===== 禁言状态 ===== */
+.input-bar-muted {
+  justify-content: center;
+}
+.muted-tip {
+  font-size: 26rpx;
+  color: #94A3B8;
+  text-align: center;
+}
+</style>
--- a/frontend/src/pages/group/create.vue
+++ b/frontend/src/pages/group/create.vue
@@ -0,0 +1,576 @@
+<!--
+  创建群聊页
+
+  设计系统：design-system/echochat/MASTER.md
+  色板：Primary #2563EB / BG #F8FAFC / Surface #F1F5F9 / Text #1E293B
+  ui-ux-pro-max 规范：防重复提交 / loading 状态 / 触摸目标 >= 88rpx
+-->
+<template>
+  <view class="page-wrapper">
+    <!-- 群名称输入区 -->
+    <view class="section">
+      <view class="section-header">
+        <text class="section-title">群名称</text>
+      </view>
+      <view class="name-input-wrap">
+        <input
+          class="name-input"
+          v-model="groupName"
+          placeholder="请输入群聊名称"
+          placeholder-style="color: #94A3B8"
+          maxlength="30"
+        />
+        <text class="name-count">{{ groupName.length }}/30</text>
+      </view>
+    </view>
+
+    <!-- 已选好友展示区 -->
+    <view v-if="selectedList.length > 0" class="section">
+      <view class="section-header">
+        <text class="section-title">已选好友（{{ selectedList.length }}）</text>
+      </view>
+      <scroll-view class="selected-scroll" scroll-x>
+        <view class="selected-list">
+          <view
+            v-for="friend in selectedList"
+            :key="friend.user_id"
+            class="selected-item"
+            @tap="toggleSelect(friend)"
+          >
+            <view class="selected-avatar" :style="{ backgroundColor: getAvatarColor(friend.nickname || friend.username) }">
+              <text class="selected-avatar-text">{{ getInitial(friend.nickname || friend.username) }}</text>
+              <view class="selected-remove">
+                <text class="selected-remove-text">×</text>
+              </view>
+            </view>
+            <text class="selected-name">{{ friend.remark || friend.nickname || friend.username }}</text>
+          </view>
+        </view>
+      </scroll-view>
+    </view>
+
+    <!-- 搜索好友 -->
+    <view class="section">
+      <view class="section-header">
+        <text class="section-title">选择好友</text>
+      </view>
+      <view class="search-bar">
+        <uni-icons type="search" size="18" color="#94A3B8" />
+        <input
+          class="search-input"
+          v-model="searchKeyword"
+          placeholder="搜索好友昵称"
+          placeholder-style="color: #94A3B8"
+        />
+        <view v-if="searchKeyword" class="search-clear" @tap="searchKeyword = ''">
+          <uni-icons type="clear" size="16" color="#94A3B8" />
+        </view>
+      </view>
+    </view>
+
+    <!-- 好友列表 -->
+    <view v-if="loading" class="skeleton-list">
+      <view v-for="i in 5" :key="i" class="skeleton-item">
+        <view class="skeleton-check"></view>
+        <view class="skeleton-avatar"></view>
+        <view class="skeleton-info">
+          <view class="skeleton-line skeleton-line--name"></view>
+        </view>
+      </view>
+    </view>
+
+    <view v-else-if="filteredFriends.length > 0" class="friend-list">
+      <view
+        v-for="friend in filteredFriends"
+        :key="friend.user_id"
+        class="friend-item"
+        @tap="toggleSelect(friend)"
+      >
+        <view class="checkbox" :class="{ 'checkbox--checked': isSelected(friend.user_id) }">
+          <text v-if="isSelected(friend.user_id)" class="checkbox-icon">✓</text>
+        </view>
+        <view class="avatar" :style="{ backgroundColor: getAvatarColor(friend.nickname || friend.username) }">
+          <text class="avatar-text">{{ getInitial(friend.nickname || friend.username) }}</text>
+        </view>
+        <view class="friend-info">
+          <text class="friend-name">{{ friend.remark || friend.nickname || friend.username }}</text>
+          <text v-if="friend.remark" class="friend-account">{{ friend.nickname || friend.username }}</text>
+        </view>
+      </view>
+    </view>
+
+    <view v-else class="empty-state">
+      <text class="empty-text">{{ searchKeyword ? '未找到匹配的好友' : '暂无好友' }}</text>
+    </view>
+
+    <!-- 底部占位 -->
+    <view class="bottom-spacer"></view>
+
+    <!-- 底部固定创建按钮 -->
+    <view class="bottom-bar">
+      <view
+        class="create-btn"
+        :class="{ 'create-btn--disabled': !canCreate || submitting }"
+        @tap="handleCreate"
+      >
+        <text class="create-btn-text">
+          {{ submitting ? '创建中...' : `创建群聊${selectedList.length > 0 ? '（' + selectedList.length + '人）' : ''}` }}
+        </text>
+      </view>
+    </view>
+  </view>
+</template>
+
+<script>
+import { ref, computed } from 'vue'
+import { onLoad } from '@dcloudio/uni-app'
+import { useContactStore } from '@/store/contact'
+import { useGroupStore } from '@/store/group'
+import { getAvatarColor, getInitial } from '@/utils/avatar'
+
+export default {
+  name: 'GroupCreate',
+  setup() {
+    const contactStore = useContactStore()
+    const groupStore = useGroupStore()
+
+    const groupName = ref('')
+    const searchKeyword = ref('')
+    const selectedIds = ref({})
+    const loading = ref(true)
+    const submitting = ref(false)
+
+    /** 已选中的好友列表 */
+    const selectedList = computed(() => {
+      return contactStore.friendList.filter(f => selectedIds.value[f.user_id])
+    })
+
+    /** 搜索过滤后的好友列表 */
+    const filteredFriends = computed(() => {
+      const kw = searchKeyword.value.trim().toLowerCase()
+      if (!kw) return contactStore.friendList
+      return contactStore.friendList.filter(f => {
+        const nickname = (f.nickname || '').toLowerCase()
+        const username = (f.username || '').toLowerCase()
+        const remark = (f.remark || '').toLowerCase()
+        return nickname.includes(kw) || username.includes(kw) || remark.includes(kw)
+      })
+    })
+
+    /** 是否满足创建条件：群名非空 + 至少选2人 */
+    const canCreate = computed(() => {
+      return groupName.value.trim().length > 0 && selectedList.value.length >= 2
+    })
+
+    /** 判断好友是否已选中 */
+    const isSelected = (userId) => {
+      return !!selectedIds.value[userId]
+    }
+
+    /** 切换好友选中状态 */
+    const toggleSelect = (friend) => {
+      const newMap = { ...selectedIds.value }
+      if (newMap[friend.user_id]) {
+        delete newMap[friend.user_id]
+      } else {
+        newMap[friend.user_id] = true
+      }
+      selectedIds.value = newMap
+    }
+
+    /** 提交创建群聊 */
+    const handleCreate = async () => {
+      if (!canCreate.value || submitting.value) return
+
+      submitting.value = true
+      try {
+        const memberIds = selectedList.value.map(f => f.user_id)
+        const result = await groupStore.createGroup(groupName.value.trim(), memberIds)
+
+        uni.showToast({ title: '群聊创建成功', icon: 'success' })
+
+        setTimeout(() => {
+          if (result && result.conversation_id) {
+            uni.redirectTo({
+              url: `/pages/group/conversation?conversationId=${result.conversation_id}&groupId=${result.group_id || 0}&peerName=${encodeURIComponent(groupName.value.trim())}`
+            })
+          } else {
+            uni.navigateBack()
+          }
+        }, 500)
+      } catch (e) {
+        console.error('创建群聊失败', e)
+        uni.showToast({
+          title: e?.data?.message || '创建群聊失败',
+          icon: 'none'
+        })
+      } finally {
+        submitting.value = false
+      }
+    }
+
+    onLoad(async () => {
+      try {
+        await contactStore.fetchFriends()
+      } catch (e) {
+        console.error('获取好友列表失败', e)
+      }
+      loading.value = false
+    })
+
+    return {
+      groupName,
+      searchKeyword,
+      selectedList,
+      filteredFriends,
+      canCreate,
+      loading,
+      submitting,
+      isSelected,
+      toggleSelect,
+      handleCreate,
+      getAvatarColor,
+      getInitial
+    }
+  }
+}
+</script>
+
+<style scoped>
+.page-wrapper {
+  min-height: 100vh;
+  background-color: #F8FAFC;
+  padding-bottom: env(safe-area-inset-bottom);
+}
+
+/* 区块通用 */
+.section {
+  margin-bottom: 16rpx;
+}
+
+.section-header {
+  padding: 20rpx 32rpx 12rpx;
+}
+
+.section-title {
+  font-size: 26rpx;
+  color: #94A3B8;
+  font-weight: 500;
+}
+
+/* 群名称输入 */
+.name-input-wrap {
+  display: flex;
+  align-items: center;
+  background-color: #FFFFFF;
+  padding: 0 32rpx;
+  height: 96rpx;
+}
+
+.name-input {
+  flex: 1;
+  font-size: 30rpx;
+  color: #1E293B;
+  height: 96rpx;
+}
+
+.name-count {
+  font-size: 24rpx;
+  color: #94A3B8;
+  flex-shrink: 0;
+  margin-left: 16rpx;
+}
+
+/* 已选好友区 */
+.selected-scroll {
+  white-space: nowrap;
+  background-color: #FFFFFF;
+  padding: 20rpx 32rpx;
+}
+
+.selected-list {
+  display: flex;
+  gap: 24rpx;
+}
+
+.selected-item {
+  display: flex;
+  flex-direction: column;
+  align-items: center;
+  width: 100rpx;
+  flex-shrink: 0;
+}
+
+.selected-avatar {
+  width: 80rpx;
+  height: 80rpx;
+  border-radius: 50%;
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  position: relative;
+}
+
+.selected-avatar-text {
+  font-size: 32rpx;
+  color: #FFFFFF;
+  font-weight: 600;
+}
+
+.selected-remove {
+  position: absolute;
+  top: -6rpx;
+  right: -6rpx;
+  width: 32rpx;
+  height: 32rpx;
+  border-radius: 50%;
+  background-color: #EF4444;
+  display: flex;
+  align-items: center;
+  justify-content: center;
+}
+
+.selected-remove-text {
+  font-size: 20rpx;
+  color: #FFFFFF;
+  font-weight: 600;
+  line-height: 1;
+}
+
+.selected-name {
+  font-size: 22rpx;
+  color: #475569;
+  margin-top: 8rpx;
+  max-width: 100rpx;
+  overflow: hidden;
+  text-overflow: ellipsis;
+  white-space: nowrap;
+  text-align: center;
+}
+
+/* 搜索栏 */
+.search-bar {
+  display: flex;
+  align-items: center;
+  background-color: #FFFFFF;
+  padding: 0 24rpx;
+  height: 80rpx;
+  gap: 12rpx;
+}
+
+.search-input {
+  flex: 1;
+  font-size: 28rpx;
+  color: #1E293B;
+  height: 80rpx;
+}
+
+.search-clear {
+  flex-shrink: 0;
+  padding: 8rpx;
+}
+
+/* 骨架屏 */
+.skeleton-list {
+  background-color: #FFFFFF;
+}
+
+.skeleton-item {
+  display: flex;
+  align-items: center;
+  padding: 20rpx 32rpx;
+  gap: 20rpx;
+  border-bottom: 1rpx solid #F1F5F9;
+}
+
+.skeleton-check {
+  width: 40rpx;
+  height: 40rpx;
+  border-radius: 8rpx;
+  background: linear-gradient(90deg, #F1F5F9 25%, #E2E8F0 50%, #F1F5F9 75%);
+  background-size: 200% 100%;
+  animation: shimmer 1.5s infinite;
+  flex-shrink: 0;
+}
+
+.skeleton-avatar {
+  width: 80rpx;
+  height: 80rpx;
+  border-radius: 50%;
+  background: linear-gradient(90deg, #F1F5F9 25%, #E2E8F0 50%, #F1F5F9 75%);
+  background-size: 200% 100%;
+  animation: shimmer 1.5s infinite;
+  flex-shrink: 0;
+}
+
+.skeleton-info {
+  flex: 1;
+  display: flex;
+  flex-direction: column;
+  gap: 10rpx;
+}
+
+.skeleton-line {
+  border-radius: 8rpx;
+  background: linear-gradient(90deg, #F1F5F9 25%, #E2E8F0 50%, #F1F5F9 75%);
+  background-size: 200% 100%;
+  animation: shimmer 1.5s infinite;
+}
+
+.skeleton-line--name {
+  width: 40%;
+  height: 28rpx;
+}
+
+@keyframes shimmer {
+  0% { background-position: 200% 0; }
+  100% { background-position: -200% 0; }
+}
+
+/* 好友列表 */
+.friend-list {
+  background-color: #FFFFFF;
+}
+
+.friend-item {
+  display: flex;
+  align-items: center;
+  padding: 20rpx 32rpx;
+  border-bottom: 1rpx solid #F1F5F9;
+  gap: 20rpx;
+  cursor: pointer;
+  transition: background-color 150ms ease;
+}
+
+.friend-item:active {
+  background-color: #F8FAFC;
+}
+
+.friend-item:last-child {
+  border-bottom: none;
+}
+
+/* 复选框 */
+.checkbox {
+  width: 40rpx;
+  height: 40rpx;
+  border-radius: 8rpx;
+  border: 2rpx solid #CBD5E1;
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  flex-shrink: 0;
+  transition: all 200ms ease;
+}
+
+.checkbox--checked {
+  background-color: #2563EB;
+  border-color: #2563EB;
+}
+
+.checkbox-icon {
+  font-size: 24rpx;
+  color: #FFFFFF;
+  font-weight: 700;
+  line-height: 1;
+}
+
+/* 头像 */
+.avatar {
+  width: 80rpx;
+  height: 80rpx;
+  border-radius: 50%;
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  flex-shrink: 0;
+}
+
+.avatar-text {
+  font-size: 32rpx;
+  color: #FFFFFF;
+  font-weight: 600;
+}
+
+/* 好友信息 */
+.friend-info {
+  flex: 1;
+  display: flex;
+  flex-direction: column;
+  gap: 4rpx;
+  min-width: 0;
+}
+
+.friend-name {
+  font-size: 30rpx;
+  color: #1E293B;
+  font-weight: 500;
+  overflow: hidden;
+  text-overflow: ellipsis;
+  white-space: nowrap;
+}
+
+.friend-account {
+  font-size: 24rpx;
+  color: #94A3B8;
+  overflow: hidden;
+  text-overflow: ellipsis;
+  white-space: nowrap;
+}
+
+/* 空状态 */
+.empty-state {
+  padding: 80rpx 0;
+  display: flex;
+  align-items: center;
+  justify-content: center;
+}
+
+.empty-text {
+  font-size: 28rpx;
+  color: #94A3B8;
+}
+
+/* 底部占位 */
+.bottom-spacer {
+  height: 140rpx;
+}
+
+/* 底部固定按钮 */
+.bottom-bar {
+  position: fixed;
+  bottom: 0;
+  left: 0;
+  right: 0;
+  padding: 16rpx 32rpx;
+  padding-bottom: calc(16rpx + env(safe-area-inset-bottom));
+  background-color: #FFFFFF;
+  box-shadow: 0 -2rpx 12rpx rgba(0, 0, 0, 0.04);
+}
+
+.create-btn {
+  height: 88rpx;
+  border-radius: 16rpx;
+  background-color: #2563EB;
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  cursor: pointer;
+  transition: opacity 200ms ease;
+}
+
+.create-btn:active {
+  opacity: 0.85;
+}
+
+.create-btn--disabled {
+  background-color: #CBD5E1;
+  pointer-events: none;
+}
+
+.create-btn-text {
+  font-size: 30rpx;
+  color: #FFFFFF;
+  font-weight: 600;
+}
+</style>
--- a/frontend/src/pages/group/invite.vue
+++ b/frontend/src/pages/group/invite.vue
@@ -0,0 +1,541 @@
+<!--
+  邀请入群页
+
+  设计系统：design-system/echochat/MASTER.md
+  色板：Primary #2563EB / BG #F8FAFC / Surface #F1F5F9 / Text #1E293B
+  功能：好友列表多选（排除已在群内的成员）、搜索过滤、已选展示、确认邀请
+-->
+<template>
+  <view class="page-wrapper">
+    <!-- 已选好友展示区 -->
+    <view v-if="selectedList.length > 0" class="section">
+      <view class="section-header">
+        <text class="section-title">已选好友（{{ selectedList.length }}）</text>
+      </view>
+      <scroll-view class="selected-scroll" scroll-x>
+        <view class="selected-list">
+          <view
+            v-for="friend in selectedList"
+            :key="friend.user_id"
+            class="selected-item"
+            @tap="toggleSelect(friend)"
+          >
+            <view class="selected-avatar" :style="{ backgroundColor: getAvatarColor(friend.nickname || friend.username) }">
+              <text class="selected-avatar-text">{{ getInitial(friend.nickname || friend.username) }}</text>
+              <view class="selected-remove">
+                <text class="selected-remove-text">×</text>
+              </view>
+            </view>
+            <text class="selected-name">{{ friend.remark || friend.nickname || friend.username }}</text>
+          </view>
+        </view>
+      </scroll-view>
+    </view>
+
+    <!-- 搜索好友 -->
+    <view class="section">
+      <view class="section-header">
+        <text class="section-title">选择好友</text>
+      </view>
+      <view class="search-bar">
+        <uni-icons type="search" size="18" color="#94A3B8" />
+        <input
+          class="search-input"
+          v-model="searchKeyword"
+          placeholder="搜索好友昵称"
+          placeholder-style="color: #94A3B8"
+        />
+        <view v-if="searchKeyword" class="search-clear" @tap="searchKeyword = ''">
+          <uni-icons type="clear" size="16" color="#94A3B8" />
+        </view>
+      </view>
+    </view>
+
+    <!-- 好友列表 -->
+    <view v-if="loading" class="skeleton-list">
+      <view v-for="i in 5" :key="i" class="skeleton-item">
+        <view class="skeleton-check"></view>
+        <view class="skeleton-avatar"></view>
+        <view class="skeleton-info">
+          <view class="skeleton-line skeleton-line--name"></view>
+        </view>
+      </view>
+    </view>
+
+    <view v-else-if="availableFriends.length > 0" class="friend-list">
+      <view
+        v-for="friend in availableFriends"
+        :key="friend.user_id"
+        class="friend-item"
+        @tap="toggleSelect(friend)"
+      >
+        <view class="checkbox" :class="{ 'checkbox--checked': isSelected(friend.user_id) }">
+          <text v-if="isSelected(friend.user_id)" class="checkbox-icon">✓</text>
+        </view>
+        <view class="avatar" :style="{ backgroundColor: getAvatarColor(friend.nickname || friend.username) }">
+          <text class="avatar-text">{{ getInitial(friend.nickname || friend.username) }}</text>
+        </view>
+        <view class="friend-info">
+          <text class="friend-name">{{ friend.remark || friend.nickname || friend.username }}</text>
+          <text v-if="friend.remark" class="friend-account">{{ friend.nickname || friend.username }}</text>
+        </view>
+      </view>
+    </view>
+
+    <view v-else class="empty-state">
+      <text class="empty-text">{{ searchKeyword ? '未找到匹配的好友' : '没有可邀请的好友' }}</text>
+    </view>
+
+    <!-- 底部占位 -->
+    <view class="bottom-spacer"></view>
+
+    <!-- 底部固定邀请按钮 -->
+    <view class="bottom-bar">
+      <view
+        class="invite-btn"
+        :class="{ 'invite-btn--disabled': selectedList.length === 0 || submitting }"
+        @tap="handleInvite"
+      >
+        <text class="invite-btn-text">
+          {{ submitting ? '邀请中...' : `确认邀请${selectedList.length > 0 ? '（' + selectedList.length + '人）' : ''}` }}
+        </text>
+      </view>
+    </view>
+  </view>
+</template>
+
+<script>
+import { ref, computed } from 'vue'
+import { onLoad } from '@dcloudio/uni-app'
+import { useContactStore } from '@/store/contact'
+import { useGroupStore } from '@/store/group'
+import { getAvatarColor, getInitial } from '@/utils/avatar'
+
+export default {
+  name: 'GroupInvite',
+  setup() {
+    const contactStore = useContactStore()
+    const groupStore = useGroupStore()
+
+    const groupId = ref(0)
+    const searchKeyword = ref('')
+    const selectedIds = ref({})
+    const loading = ref(true)
+    const submitting = ref(false)
+
+    /** 已在群内的成员 ID 集合 */
+    const memberIdSet = computed(() => {
+      const set = new Set()
+      for (const m of groupStore.currentMembers) {
+        set.add(m.user_id)
+      }
+      return set
+    })
+
+    /** 过滤掉已在群内的好友 + 搜索关键词过滤 */
+    const availableFriends = computed(() => {
+      const filtered = contactStore.friendList.filter(f => !memberIdSet.value.has(f.user_id))
+      const kw = searchKeyword.value.trim().toLowerCase()
+      if (!kw) return filtered
+      return filtered.filter(f => {
+        const nickname = (f.nickname || '').toLowerCase()
+        const username = (f.username || '').toLowerCase()
+        const remark = (f.remark || '').toLowerCase()
+        return nickname.includes(kw) || username.includes(kw) || remark.includes(kw)
+      })
+    })
+
+    /** 已选中的好友列表 */
+    const selectedList = computed(() => {
+      return contactStore.friendList.filter(f => selectedIds.value[f.user_id])
+    })
+
+    /** 判断好友是否已选中 */
+    const isSelected = (userId) => {
+      return !!selectedIds.value[userId]
+    }
+
+    /** 切换好友选中状态 */
+    const toggleSelect = (friend) => {
+      const newMap = { ...selectedIds.value }
+      if (newMap[friend.user_id]) {
+        delete newMap[friend.user_id]
+      } else {
+        newMap[friend.user_id] = true
+      }
+      selectedIds.value = newMap
+    }
+
+    /** 提交邀请 */
+    const handleInvite = async () => {
+      if (selectedList.value.length === 0 || submitting.value) return
+
+      submitting.value = true
+      try {
+        const userIds = selectedList.value.map(f => f.user_id)
+        await groupStore.inviteMembers(groupId.value, userIds)
+
+        uni.showToast({ title: '邀请成功', icon: 'success' })
+
+        setTimeout(() => {
+          uni.navigateBack()
+        }, 500)
+      } catch (e) {
+        console.error('邀请入群失败', e)
+        uni.showToast({
+          title: e?.data?.message || '邀请失败',
+          icon: 'none'
+        })
+      } finally {
+        submitting.value = false
+      }
+    }
+
+    // ==================== 生命周期 ====================
+
+    onLoad(async (query) => {
+      groupId.value = parseInt(query.groupId) || 0
+
+      try {
+        const tasks = [contactStore.fetchFriends()]
+        if (groupId.value) {
+          tasks.push(groupStore.fetchMembers(groupId.value))
+        }
+        await Promise.all(tasks)
+      } catch (e) {
+        console.error('加载数据失败', e)
+      }
+      loading.value = false
+    })
+
+    return {
+      searchKeyword,
+      selectedList,
+      availableFriends,
+      loading,
+      submitting,
+      isSelected,
+      toggleSelect,
+      handleInvite,
+      getAvatarColor,
+      getInitial
+    }
+  }
+}
+</script>
+
+<style scoped>
+.page-wrapper {
+  min-height: 100vh;
+  background-color: #F8FAFC;
+  padding-bottom: env(safe-area-inset-bottom);
+}
+
+/* 区块通用 */
+.section {
+  margin-bottom: 16rpx;
+}
+
+.section-header {
+  padding: 20rpx 32rpx 12rpx;
+}
+
+.section-title {
+  font-size: 26rpx;
+  color: #94A3B8;
+  font-weight: 500;
+}
+
+/* 已选好友区 */
+.selected-scroll {
+  white-space: nowrap;
+  background-color: #FFFFFF;
+  padding: 20rpx 32rpx;
+}
+
+.selected-list {
+  display: flex;
+  gap: 24rpx;
+}
+
+.selected-item {
+  display: flex;
+  flex-direction: column;
+  align-items: center;
+  width: 100rpx;
+  flex-shrink: 0;
+}
+
+.selected-avatar {
+  width: 80rpx;
+  height: 80rpx;
+  border-radius: 50%;
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  position: relative;
+}
+
+.selected-avatar-text {
+  font-size: 32rpx;
+  color: #FFFFFF;
+  font-weight: 600;
+}
+
+.selected-remove {
+  position: absolute;
+  top: -6rpx;
+  right: -6rpx;
+  width: 32rpx;
+  height: 32rpx;
+  border-radius: 50%;
+  background-color: #EF4444;
+  display: flex;
+  align-items: center;
+  justify-content: center;
+}
+
+.selected-remove-text {
+  font-size: 20rpx;
+  color: #FFFFFF;
+  font-weight: 600;
+  line-height: 1;
+}
+
+.selected-name {
+  font-size: 22rpx;
+  color: #475569;
+  margin-top: 8rpx;
+  max-width: 100rpx;
+  overflow: hidden;
+  text-overflow: ellipsis;
+  white-space: nowrap;
+  text-align: center;
+}
+
+/* 搜索栏 */
+.search-bar {
+  display: flex;
+  align-items: center;
+  background-color: #FFFFFF;
+  padding: 0 24rpx;
+  height: 80rpx;
+  gap: 12rpx;
+}
+
+.search-input {
+  flex: 1;
+  font-size: 28rpx;
+  color: #1E293B;
+  height: 80rpx;
+}
+
+.search-clear {
+  flex-shrink: 0;
+  padding: 8rpx;
+}
+
+/* 骨架屏 */
+.skeleton-list {
+  background-color: #FFFFFF;
+}
+
+.skeleton-item {
+  display: flex;
+  align-items: center;
+  padding: 20rpx 32rpx;
+  gap: 20rpx;
+  border-bottom: 1rpx solid #F1F5F9;
+}
+
+.skeleton-check {
+  width: 40rpx;
+  height: 40rpx;
+  border-radius: 8rpx;
+  background: linear-gradient(90deg, #F1F5F9 25%, #E2E8F0 50%, #F1F5F9 75%);
+  background-size: 200% 100%;
+  animation: shimmer 1.5s infinite;
+  flex-shrink: 0;
+}
+
+.skeleton-avatar {
+  width: 80rpx;
+  height: 80rpx;
+  border-radius: 50%;
+  background: linear-gradient(90deg, #F1F5F9 25%, #E2E8F0 50%, #F1F5F9 75%);
+  background-size: 200% 100%;
+  animation: shimmer 1.5s infinite;
+  flex-shrink: 0;
+}
+
+.skeleton-info {
+  flex: 1;
+  display: flex;
+  flex-direction: column;
+  gap: 10rpx;
+}
+
+.skeleton-line {
+  border-radius: 8rpx;
+  background: linear-gradient(90deg, #F1F5F9 25%, #E2E8F0 50%, #F1F5F9 75%);
+  background-size: 200% 100%;
+  animation: shimmer 1.5s infinite;
+}
+
+.skeleton-line--name {
+  width: 40%;
+  height: 28rpx;
+}
+
+@keyframes shimmer {
+  0% { background-position: 200% 0; }
+  100% { background-position: -200% 0; }
+}
+
+/* 好友列表 */
+.friend-list {
+  background-color: #FFFFFF;
+}
+
+.friend-item {
+  display: flex;
+  align-items: center;
+  padding: 20rpx 32rpx;
+  border-bottom: 1rpx solid #F1F5F9;
+  gap: 20rpx;
+  cursor: pointer;
+  transition: background-color 150ms ease;
+}
+
+.friend-item:active {
+  background-color: #F8FAFC;
+}
+
+.friend-item:last-child {
+  border-bottom: none;
+}
+
+/* 复选框 */
+.checkbox {
+  width: 40rpx;
+  height: 40rpx;
+  border-radius: 8rpx;
+  border: 2rpx solid #CBD5E1;
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  flex-shrink: 0;
+  transition: all 200ms ease;
+}
+
+.checkbox--checked {
+  background-color: #2563EB;
+  border-color: #2563EB;
+}
+
+.checkbox-icon {
+  font-size: 24rpx;
+  color: #FFFFFF;
+  font-weight: 700;
+  line-height: 1;
+}
+
+/* 头像 */
+.avatar {
+  width: 80rpx;
+  height: 80rpx;
+  border-radius: 50%;
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  flex-shrink: 0;
+}
+
+.avatar-text {
+  font-size: 32rpx;
+  color: #FFFFFF;
+  font-weight: 600;
+}
+
+/* 好友信息 */
+.friend-info {
+  flex: 1;
+  display: flex;
+  flex-direction: column;
+  gap: 4rpx;
+  min-width: 0;
+}
+
+.friend-name {
+  font-size: 30rpx;
+  color: #1E293B;
+  font-weight: 500;
+  overflow: hidden;
+  text-overflow: ellipsis;
+  white-space: nowrap;
+}
+
+.friend-account {
+  font-size: 24rpx;
+  color: #94A3B8;
+  overflow: hidden;
+  text-overflow: ellipsis;
+  white-space: nowrap;
+}
+
+/* 空状态 */
+.empty-state {
+  padding: 80rpx 0;
+  display: flex;
+  align-items: center;
+  justify-content: center;
+}
+
+.empty-text {
+  font-size: 28rpx;
+  color: #94A3B8;
+}
+
+/* 底部占位 */
+.bottom-spacer {
+  height: 140rpx;
+}
+
+/* 底部固定按钮 */
+.bottom-bar {
+  position: fixed;
+  bottom: 0;
+  left: 0;
+  right: 0;
+  padding: 16rpx 32rpx;
+  padding-bottom: calc(16rpx + env(safe-area-inset-bottom));
+  background-color: #FFFFFF;
+  box-shadow: 0 -2rpx 12rpx rgba(0, 0, 0, 0.04);
+}
+
+.invite-btn {
+  height: 88rpx;
+  border-radius: 16rpx;
+  background-color: #2563EB;
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  cursor: pointer;
+  transition: opacity 200ms ease;
+}
+
+.invite-btn:active {
+  opacity: 0.85;
+}
+
+.invite-btn--disabled {
+  background-color: #CBD5E1;
+  pointer-events: none;
+}
+
+.invite-btn-text {
+  font-size: 30rpx;
+  color: #FFFFFF;
+  font-weight: 600;
+}
+</style>
--- a/frontend/src/pages/group/join-requests.vue
+++ b/frontend/src/pages/group/join-requests.vue
@@ -0,0 +1,515 @@
+<!--
+  入群申请审批页
+
+  设计系统：design-system/echochat/MASTER.md
+  色板：Primary #2563EB / BG #F8FAFC / Surface #F1F5F9 / Text #1E293B
+  功能：查看待审批/已处理的入群申请，通过或拒绝操作
+-->
+<template>
+  <view class="page-wrapper">
+    <!-- 骨架屏 -->
+    <view v-if="loading" class="skeleton-list">
+      <view v-for="i in 4" :key="i" class="skeleton-item">
+        <view class="skeleton-avatar"></view>
+        <view class="skeleton-info">
+          <view class="skeleton-line skeleton-line--name"></view>
+          <view class="skeleton-line skeleton-line--msg"></view>
+        </view>
+        <view class="skeleton-actions">
+          <view class="skeleton-btn"></view>
+          <view class="skeleton-btn"></view>
+        </view>
+      </view>
+    </view>
+
+    <!-- 内容区域 -->
+    <view v-else>
+      <!-- 待审批区域 -->
+      <view v-if="pendingList.length > 0" class="section">
+        <view class="section-header">
+          <text class="section-title">待审批（{{ pendingList.length }}）</text>
+        </view>
+        <view class="request-list">
+          <view
+            v-for="req in pendingList"
+            :key="req.id"
+            class="request-item"
+          >
+            <image
+              v-if="req.avatar"
+              class="request-avatar"
+              :src="req.avatar"
+              mode="aspectFill"
+            />
+            <view
+              v-else
+              class="request-avatar request-avatar-placeholder"
+              :style="{ backgroundColor: getAvatarColor(req.nickname || req.username) }"
+            >
+              <text class="avatar-char">{{ getInitial(req.nickname || req.username) }}</text>
+            </view>
+
+            <view class="request-info">
+              <text class="request-name">{{ req.nickname || req.username }}</text>
+              <text class="request-msg" v-if="req.message">{{ req.message }}</text>
+              <text class="request-msg" v-else>申请加入群聊</text>
+              <text class="request-time">{{ formatTime(req.created_at) }}</text>
+            </view>
+
+            <view class="request-actions">
+              <view
+                class="btn btn--approve"
+                :class="{ 'btn--disabled': processingMap[req.id] }"
+                @tap="handleApprove(req)"
+              >
+                <text class="btn-text">通过</text>
+              </view>
+              <view
+                class="btn btn--reject"
+                :class="{ 'btn--disabled': processingMap[req.id] }"
+                @tap="handleReject(req)"
+              >
+                <text class="btn-text btn-text--reject">拒绝</text>
+              </view>
+            </view>
+          </view>
+        </view>
+      </view>
+
+      <!-- 已处理区域 -->
+      <view v-if="processedList.length > 0" class="section">
+        <view class="section-header">
+          <text class="section-title">已处理（{{ processedList.length }}）</text>
+        </view>
+        <view class="request-list">
+          <view
+            v-for="req in processedList"
+            :key="req.id"
+            class="request-item"
+          >
+            <image
+              v-if="req.avatar"
+              class="request-avatar"
+              :src="req.avatar"
+              mode="aspectFill"
+            />
+            <view
+              v-else
+              class="request-avatar request-avatar-placeholder"
+              :style="{ backgroundColor: getAvatarColor(req.nickname || req.username) }"
+            >
+              <text class="avatar-char">{{ getInitial(req.nickname || req.username) }}</text>
+            </view>
+
+            <view class="request-info">
+              <text class="request-name">{{ req.nickname || req.username }}</text>
+              <text class="request-msg" v-if="req.message">{{ req.message }}</text>
+              <text class="request-msg" v-else>申请加入群聊</text>
+              <text class="request-time">{{ formatTime(req.created_at) }}</text>
+            </view>
+
+            <view class="status-tag" :class="req.status === 1 ? 'status-tag--approved' : 'status-tag--rejected'">
+              <text class="status-tag-text" :class="req.status === 1 ? 'status-tag-text--approved' : 'status-tag-text--rejected'">
+                {{ req.status === 1 ? '已通过' : '已拒绝' }}
+              </text>
+            </view>
+          </view>
+        </view>
+      </view>
+
+      <!-- 空状态 -->
+      <view v-if="pendingList.length === 0 && processedList.length === 0" class="empty-state">
+        <uni-icons type="person" size="48" color="#CBD5E1" />
+        <text class="empty-title">暂无入群申请</text>
+        <text class="empty-desc">当有人申请加入群聊时，会在这里显示</text>
+      </view>
+    </view>
+  </view>
+</template>
+
+<script>
+import { onLoad, onUnload } from '@dcloudio/uni-app'
+import { ref, computed, reactive } from 'vue'
+import { useGroupStore } from '@/store/group'
+import { getAvatarColor, getInitial } from '@/utils/avatar'
+import wsService from '@/services/websocket'
+
+export default {
+  name: 'GroupJoinRequests',
+  setup() {
+    const groupStore = useGroupStore()
+
+    const groupId = ref(0)
+    const loading = ref(true)
+    const processingMap = reactive({})
+    /** 本地维护的已处理申请（审批后从 store 移除但需要页面展示） */
+    const localProcessed = ref([])
+
+    /** 待审批列表：status === 0 */
+    const pendingList = computed(() => {
+      return groupStore.joinRequests.filter(r => r.status === 0)
+    })
+
+    /**
+     * 已处理列表：合并后端返回的已处理申请 + 本地刚审批的
+     * 后端 fetch 可能已返回 status !== 0 的，加上本地审批后保存的
+     */
+    const processedList = computed(() => {
+      const fromStore = groupStore.joinRequests.filter(r => r.status !== 0)
+      const processedIds = new Set(fromStore.map(r => r.id))
+      const fromLocal = localProcessed.value.filter(r => !processedIds.has(r.id))
+      return [...fromStore, ...fromLocal]
+    })
+
+    /** 格式化时间 */
+    const formatTime = (dateStr) => {
+      if (!dateStr) return ''
+      const date = new Date(dateStr)
+      const now = new Date()
+      const diff = now - date
+      const minutes = Math.floor(diff / 60000)
+      if (minutes < 1) return '刚刚'
+      if (minutes < 60) return `${minutes} 分钟前`
+      const hours = Math.floor(minutes / 60)
+      if (hours < 24) return `${hours} 小时前`
+      const days = Math.floor(hours / 24)
+      if (days < 7) return `${days} 天前`
+      return `${date.getMonth() + 1}/${date.getDate()}`
+    }
+
+    // ==================== 生命周期 ====================
+
+    /** 新入群申请到达时自动刷新列表 */
+    const _onNewJoinRequest = () => {
+      if (groupId.value) {
+        loadRequests()
+      }
+    }
+
+    onLoad((query) => {
+      groupId.value = parseInt(query.groupId) || 0
+      if (groupId.value) {
+        loadRequests()
+      } else {
+        loading.value = false
+      }
+      wsService.on('group.join.request', _onNewJoinRequest)
+    })
+
+    onUnload(() => {
+      wsService.off('group.join.request', _onNewJoinRequest)
+    })
+
+    /** 加载入群申请列表 */
+    const loadRequests = async () => {
+      loading.value = true
+      try {
+        await groupStore.fetchJoinRequests(groupId.value)
+      } catch (e) {
+        console.error('获取入群申请失败', e)
+        uni.showToast({ title: e?.data?.message || '获取申请列表失败', icon: 'none' })
+      }
+      loading.value = false
+    }
+
+    // ==================== 审批操作 ====================
+
+    /** 通过申请 */
+    const handleApprove = async (req) => {
+      if (processingMap[req.id]) return
+      processingMap[req.id] = true
+      try {
+        await groupStore.reviewJoinRequest(groupId.value, req.id, 'approve')
+        localProcessed.value.unshift({ ...req, status: 1 })
+        uni.showToast({ title: '已通过', icon: 'success' })
+      } catch (e) {
+        console.error('审批通过失败', e)
+        uni.showToast({ title: e?.data?.message || '操作失败', icon: 'none' })
+      } finally {
+        processingMap[req.id] = false
+      }
+    }
+
+    /** 拒绝申请 */
+    const handleReject = async (req) => {
+      if (processingMap[req.id]) return
+      processingMap[req.id] = true
+      try {
+        await groupStore.reviewJoinRequest(groupId.value, req.id, 'reject')
+        localProcessed.value.unshift({ ...req, status: 2 })
+        uni.showToast({ title: '已拒绝', icon: 'none' })
+      } catch (e) {
+        console.error('审批拒绝失败', e)
+        uni.showToast({ title: e?.data?.message || '操作失败', icon: 'none' })
+      } finally {
+        processingMap[req.id] = false
+      }
+    }
+
+    return {
+      loading,
+      pendingList,
+      processedList,
+      processingMap,
+      formatTime,
+      handleApprove,
+      handleReject,
+      getAvatarColor,
+      getInitial
+    }
+  }
+}
+</script>
+
+<style scoped>
+.page-wrapper {
+  min-height: 100vh;
+  background-color: #F8FAFC;
+  padding-bottom: env(safe-area-inset-bottom);
+}
+
+/* ===== 骨架屏 ===== */
+.skeleton-list {
+  background-color: #FFFFFF;
+}
+
+.skeleton-item {
+  display: flex;
+  align-items: center;
+  padding: 24rpx 32rpx;
+  gap: 20rpx;
+  border-bottom: 1rpx solid #F1F5F9;
+}
+
+.skeleton-avatar {
+  width: 80rpx;
+  height: 80rpx;
+  border-radius: 20rpx;
+  background: linear-gradient(90deg, #F1F5F9 25%, #E2E8F0 50%, #F1F5F9 75%);
+  background-size: 200% 100%;
+  animation: shimmer 1.5s infinite;
+  flex-shrink: 0;
+}
+
+.skeleton-info {
+  flex: 1;
+  display: flex;
+  flex-direction: column;
+  gap: 10rpx;
+}
+
+.skeleton-line {
+  border-radius: 8rpx;
+  background: linear-gradient(90deg, #F1F5F9 25%, #E2E8F0 50%, #F1F5F9 75%);
+  background-size: 200% 100%;
+  animation: shimmer 1.5s infinite;
+}
+
+.skeleton-line--name {
+  width: 40%;
+  height: 28rpx;
+}
+
+.skeleton-line--msg {
+  width: 60%;
+  height: 24rpx;
+}
+
+.skeleton-actions {
+  display: flex;
+  gap: 12rpx;
+}
+
+.skeleton-btn {
+  width: 100rpx;
+  height: 56rpx;
+  border-radius: 12rpx;
+  background: linear-gradient(90deg, #F1F5F9 25%, #E2E8F0 50%, #F1F5F9 75%);
+  background-size: 200% 100%;
+  animation: shimmer 1.5s infinite;
+}
+
+@keyframes shimmer {
+  0% { background-position: 200% 0; }
+  100% { background-position: -200% 0; }
+}
+
+/* ===== 区块 ===== */
+.section {
+  margin-bottom: 16rpx;
+}
+
+.section-header {
+  padding: 20rpx 32rpx 12rpx;
+}
+
+.section-title {
+  font-size: 26rpx;
+  color: #94A3B8;
+  font-weight: 500;
+}
+
+/* ===== 申请列表 ===== */
+.request-list {
+  background-color: #FFFFFF;
+}
+
+.request-item {
+  display: flex;
+  align-items: center;
+  padding: 24rpx 32rpx;
+  border-bottom: 1rpx solid #F1F5F9;
+  gap: 20rpx;
+}
+
+.request-item:last-child {
+  border-bottom: none;
+}
+
+/* ===== 头像 ===== */
+.request-avatar {
+  width: 80rpx;
+  height: 80rpx;
+  border-radius: 20rpx;
+  flex-shrink: 0;
+}
+
+.request-avatar-placeholder {
+  display: flex;
+  align-items: center;
+  justify-content: center;
+}
+
+.avatar-char {
+  color: #FFFFFF;
+  font-size: 28rpx;
+  font-weight: 600;
+}
+
+/* ===== 申请信息 ===== */
+.request-info {
+  flex: 1;
+  display: flex;
+  flex-direction: column;
+  gap: 6rpx;
+  min-width: 0;
+}
+
+.request-name {
+  font-size: 30rpx;
+  color: #1E293B;
+  font-weight: 500;
+  overflow: hidden;
+  text-overflow: ellipsis;
+  white-space: nowrap;
+}
+
+.request-msg {
+  font-size: 24rpx;
+  color: #64748B;
+  overflow: hidden;
+  text-overflow: ellipsis;
+  white-space: nowrap;
+}
+
+.request-time {
+  font-size: 22rpx;
+  color: #94A3B8;
+}
+
+/* ===== 操作按钮 ===== */
+.request-actions {
+  display: flex;
+  flex-direction: column;
+  gap: 12rpx;
+  flex-shrink: 0;
+}
+
+.btn {
+  padding: 12rpx 28rpx;
+  border-radius: 12rpx;
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  cursor: pointer;
+  transition: opacity 200ms ease;
+}
+
+.btn:active {
+  opacity: 0.7;
+}
+
+.btn--approve {
+  background-color: #22C55E;
+}
+
+.btn--reject {
+  background-color: #F1F5F9;
+}
+
+.btn--disabled {
+  opacity: 0.5;
+  pointer-events: none;
+}
+
+.btn-text {
+  font-size: 24rpx;
+  font-weight: 500;
+  color: #FFFFFF;
+}
+
+.btn-text--reject {
+  color: #EF4444;
+}
+
+/* ===== 状态标签 ===== */
+.status-tag {
+  padding: 8rpx 20rpx;
+  border-radius: 12rpx;
+  flex-shrink: 0;
+}
+
+.status-tag--approved {
+  background-color: rgba(34, 197, 94, 0.08);
+}
+
+.status-tag--rejected {
+  background-color: rgba(239, 68, 68, 0.08);
+}
+
+.status-tag-text {
+  font-size: 24rpx;
+  font-weight: 500;
+}
+
+.status-tag-text--approved {
+  color: #22C55E;
+}
+
+.status-tag-text--rejected {
+  color: #EF4444;
+}
+
+/* ===== 空状态 ===== */
+.empty-state {
+  display: flex;
+  flex-direction: column;
+  align-items: center;
+  justify-content: center;
+  padding-top: 300rpx;
+  gap: 16rpx;
+}
+
+.empty-title {
+  font-size: 32rpx;
+  color: #64748B;
+  font-weight: 500;
+}
+
+.empty-desc {
+  font-size: 26rpx;
+  color: #94A3B8;
+  text-align: center;
+  padding: 0 60rpx;
+}
+</style>
--- a/frontend/src/pages/group/members.vue
+++ b/frontend/src/pages/group/members.vue
@@ -0,0 +1,453 @@
+<!--
+  群成员列表页
+
+  设计系统：design-system/echochat/MASTER.md
+  色板：Primary #2563EB / BG #F8FAFC / Surface #F1F5F9 / Text #1E293B
+  功能：成员搜索、角色标识、禁言标识、管理操作（设管理员/禁言/踢人）
+-->
+<template>
+  <view class="page-wrapper">
+    <!-- 搜索栏 -->
+    <view class="search-section">
+      <view class="search-bar">
+        <uni-icons type="search" size="18" color="#94A3B8" />
+        <input
+          class="search-input"
+          v-model="searchKeyword"
+          placeholder="搜索成员昵称"
+          placeholder-style="color: #94A3B8"
+        />
+        <view v-if="searchKeyword" class="search-clear" @tap="searchKeyword = ''">
+          <uni-icons type="clear" size="16" color="#94A3B8" />
+        </view>
+      </view>
+    </view>
+
+    <!-- 成员数量标题 -->
+    <view class="section-header">
+      <text class="section-title">全部成员（{{ filteredMembers.length }}）</text>
+    </view>
+
+    <!-- 成员列表 -->
+    <view v-if="filteredMembers.length > 0" class="member-list">
+      <view
+        v-for="member in filteredMembers"
+        :key="member.user_id"
+        class="member-item"
+        @longpress="onMemberLongPress(member)"
+      >
+        <image
+          v-if="member.avatar"
+          class="member-avatar"
+          :src="member.avatar"
+          mode="aspectFill"
+        />
+        <view
+          v-else
+          class="member-avatar member-avatar-placeholder"
+          :style="{ backgroundColor: getAvatarColor(member.nickname || member.username) }"
+        >
+          <text class="avatar-char">{{ getInitial(member.nickname || member.username) }}</text>
+        </view>
+
+        <view class="member-info">
+          <view class="member-name-row">
+            <text class="member-name">{{ member.nickname || member.username }}</text>
+            <text v-if="member.role === GROUP_ROLE.OWNER" class="role-tag role-tag-owner">🔑 群主</text>
+            <text v-else-if="member.role === GROUP_ROLE.ADMIN" class="role-tag role-tag-admin">🛡 管理员</text>
+          </view>
+          <view v-if="member.is_muted" class="muted-row">
+            <text class="muted-tag">已禁言</text>
+          </view>
+        </view>
+
+        <uni-icons
+          v-if="canManage(member)"
+          type="more-filled"
+          size="18"
+          color="#94A3B8"
+        />
+      </view>
+    </view>
+
+    <view v-else class="empty-state">
+      <text class="empty-text">{{ searchKeyword ? '未找到匹配的成员' : '暂无成员' }}</text>
+    </view>
+
+    <!-- 右上角邀请按钮 -->
+    <view class="fab-btn" @tap="goToInvite">
+      <uni-icons type="plusempty" size="24" color="#FFFFFF" />
+    </view>
+  </view>
+</template>
+
+<script>
+import { onLoad } from '@dcloudio/uni-app'
+import { ref, computed } from 'vue'
+import { useGroupStore } from '@/store/group'
+import { useUserStore } from '@/store/user'
+import { getAvatarColor, getInitial } from '@/utils/avatar'
+import { GROUP_ROLE } from '@/constants/group'
+
+export default {
+  name: 'GroupMembers',
+  setup() {
+    const groupStore = useGroupStore()
+    const userStore = useUserStore()
+
+    const groupId = ref(0)
+    const searchKeyword = ref('')
+
+    const currentMembers = computed(() => groupStore.currentMembers)
+    const myId = computed(() => Number(userStore.userInfo?.id) || 0)
+
+    /** 当前用户在群中的角色 */
+    const myRole = computed(() => {
+      const me = currentMembers.value.find(m => m.user_id === myId.value)
+      return me ? me.role : 0
+    })
+
+    /** 搜索过滤后的成员列表 */
+    const filteredMembers = computed(() => {
+      const kw = searchKeyword.value.trim().toLowerCase()
+      if (!kw) return currentMembers.value
+      return currentMembers.value.filter(m => {
+        const nickname = (m.nickname || '').toLowerCase()
+        const username = (m.username || '').toLowerCase()
+        return nickname.includes(kw) || username.includes(kw)
+      })
+    })
+
+    /**
+     * 判断当前用户是否可以管理某个成员
+     * - 群主可管理所有非群主成员
+     * - 管理员仅可管理普通成员
+     * - 普通成员无管理权限
+     * - 不能管理自己
+     */
+    const canManage = (member) => {
+      if (member.user_id === myId.value) return false
+      if (myRole.value === GROUP_ROLE.OWNER) return member.role !== GROUP_ROLE.OWNER
+      if (myRole.value === GROUP_ROLE.ADMIN) return member.role === GROUP_ROLE.MEMBER
+      return false
+    }
+
+    // ==================== 生命周期 ====================
+
+    onLoad((query) => {
+      groupId.value = parseInt(query.groupId) || 0
+      if (groupId.value) {
+        groupStore.fetchMembers(groupId.value)
+      }
+    })
+
+    // ==================== 管理操作 ====================
+
+    const onMemberLongPress = (member) => {
+      if (!canManage(member)) return
+
+      const actions = []
+
+      if (myRole.value === GROUP_ROLE.OWNER) {
+        if (member.role === GROUP_ROLE.ADMIN) {
+          actions.push('取消管理员')
+        } else {
+          actions.push('设为管理员')
+        }
+      }
+
+      if (member.is_muted) {
+        actions.push('解除禁言')
+      } else {
+        actions.push('禁言')
+      }
+
+      actions.push('踢出群聊')
+
+      uni.showActionSheet({
+        itemList: actions,
+        success: (res) => {
+          const action = actions[res.tapIndex]
+          handleAction(action, member)
+        }
+      })
+    }
+
+    const handleAction = (action, member) => {
+      switch (action) {
+        case '设为管理员':
+          confirmSetRole(member, GROUP_ROLE.ADMIN)
+          break
+        case '取消管理员':
+          confirmSetRole(member, GROUP_ROLE.MEMBER)
+          break
+        case '禁言':
+          confirmMute(member, true)
+          break
+        case '解除禁言':
+          confirmMute(member, false)
+          break
+        case '踢出群聊':
+          confirmKick(member)
+          break
+      }
+    }
+
+    const confirmSetRole = (member, role) => {
+      const roleName = role === GROUP_ROLE.ADMIN ? '管理员' : '普通成员'
+      const name = member.nickname || member.username
+      uni.showModal({
+        title: '确认操作',
+        content: `确定将 ${name} 设为${roleName}吗？`,
+        success: async (res) => {
+          if (res.confirm) {
+            try {
+              await groupStore.setMemberRole(groupId.value, member.user_id, role)
+              uni.showToast({ title: '操作成功', icon: 'success' })
+            } catch (e) {
+              uni.showToast({ title: e?.data?.message || '操作失败', icon: 'none' })
+            }
+          }
+        }
+      })
+    }
+
+    const confirmMute = (member, isMuted) => {
+      const name = member.nickname || member.username
+      const tip = isMuted ? `确定禁言 ${name} 吗？` : `确定解除 ${name} 的禁言吗？`
+      uni.showModal({
+        title: '确认操作',
+        content: tip,
+        success: async (res) => {
+          if (res.confirm) {
+            try {
+              await groupStore.muteMember(groupId.value, member.user_id, isMuted)
+              uni.showToast({ title: '操作成功', icon: 'success' })
+            } catch (e) {
+              uni.showToast({ title: e?.data?.message || '操作失败', icon: 'none' })
+            }
+          }
+        }
+      })
+    }
+
+    const confirmKick = (member) => {
+      const name = member.nickname || member.username
+      uni.showModal({
+        title: '踢出群聊',
+        content: `确定将 ${name} 踢出群聊吗？`,
+        confirmColor: '#EF4444',
+        success: async (res) => {
+          if (res.confirm) {
+            try {
+              await groupStore.kickMember(groupId.value, member.user_id)
+              uni.showToast({ title: '已踢出', icon: 'success' })
+            } catch (e) {
+              uni.showToast({ title: e?.data?.message || '操作失败', icon: 'none' })
+            }
+          }
+        }
+      })
+    }
+
+    // ==================== 导航 ====================
+
+    const goToInvite = () => {
+      uni.navigateTo({
+        url: `/pages/group/invite?groupId=${groupId.value}`
+      })
+    }
+
+    return {
+      GROUP_ROLE,
+      searchKeyword,
+      filteredMembers,
+      canManage,
+      onMemberLongPress,
+      goToInvite,
+      getAvatarColor,
+      getInitial
+    }
+  }
+}
+</script>
+
+<style scoped>
+.page-wrapper {
+  min-height: 100vh;
+  background-color: #F8FAFC;
+  padding-bottom: env(safe-area-inset-bottom);
+}
+
+/* ===== 搜索栏 ===== */
+.search-section {
+  background-color: #FFFFFF;
+  padding: 16rpx 24rpx;
+  border-bottom: 1rpx solid #E2E8F0;
+}
+
+.search-bar {
+  display: flex;
+  align-items: center;
+  background-color: #F1F5F9;
+  border-radius: 36rpx;
+  padding: 0 24rpx;
+  height: 72rpx;
+  gap: 12rpx;
+}
+
+.search-input {
+  flex: 1;
+  font-size: 28rpx;
+  color: #1E293B;
+  height: 72rpx;
+}
+
+.search-clear {
+  flex-shrink: 0;
+  padding: 8rpx;
+}
+
+/* ===== 区块标题 ===== */
+.section-header {
+  padding: 20rpx 32rpx 12rpx;
+}
+
+.section-title {
+  font-size: 26rpx;
+  color: #94A3B8;
+  font-weight: 500;
+}
+
+/* ===== 成员列表 ===== */
+.member-list {
+  background-color: #FFFFFF;
+}
+
+.member-item {
+  display: flex;
+  align-items: center;
+  padding: 20rpx 32rpx;
+  border-bottom: 1rpx solid #F1F5F9;
+  gap: 20rpx;
+  transition: background-color 150ms ease;
+}
+
+.member-item:active {
+  background-color: #F8FAFC;
+}
+
+.member-item:last-child {
+  border-bottom: none;
+}
+
+/* ===== 头像 ===== */
+.member-avatar {
+  width: 80rpx;
+  height: 80rpx;
+  border-radius: 20rpx;
+  flex-shrink: 0;
+}
+
+.member-avatar-placeholder {
+  display: flex;
+  align-items: center;
+  justify-content: center;
+}
+
+.avatar-char {
+  color: #FFFFFF;
+  font-size: 28rpx;
+  font-weight: 600;
+}
+
+/* ===== 成员信息 ===== */
+.member-info {
+  flex: 1;
+  display: flex;
+  flex-direction: column;
+  gap: 6rpx;
+  min-width: 0;
+}
+
+.member-name-row {
+  display: flex;
+  align-items: center;
+  gap: 12rpx;
+}
+
+.member-name {
+  font-size: 30rpx;
+  color: #1E293B;
+  font-weight: 500;
+  overflow: hidden;
+  text-overflow: ellipsis;
+  white-space: nowrap;
+}
+
+/* ===== 角色标签 ===== */
+.role-tag {
+  font-size: 22rpx;
+  padding: 4rpx 12rpx;
+  border-radius: 8rpx;
+  flex-shrink: 0;
+  line-height: 1.4;
+}
+
+.role-tag-owner {
+  color: #D97706;
+  background-color: rgba(217, 119, 6, 0.08);
+}
+
+.role-tag-admin {
+  color: #2563EB;
+  background-color: rgba(37, 99, 235, 0.08);
+}
+
+/* ===== 禁言标签 ===== */
+.muted-row {
+  display: flex;
+  align-items: center;
+}
+
+.muted-tag {
+  font-size: 22rpx;
+  color: #EF4444;
+  background-color: rgba(239, 68, 68, 0.08);
+  padding: 2rpx 12rpx;
+  border-radius: 6rpx;
+}
+
+/* ===== 空状态 ===== */
+.empty-state {
+  padding: 80rpx 0;
+  display: flex;
+  align-items: center;
+  justify-content: center;
+}
+
+.empty-text {
+  font-size: 28rpx;
+  color: #94A3B8;
+}
+
+/* ===== 悬浮按钮 ===== */
+.fab-btn {
+  position: fixed;
+  right: 32rpx;
+  bottom: calc(64rpx + env(safe-area-inset-bottom));
+  width: 96rpx;
+  height: 96rpx;
+  border-radius: 50%;
+  background-color: #2563EB;
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  box-shadow: 0 8rpx 24rpx rgba(37, 99, 235, 0.3);
+  transition: opacity 200ms ease;
+}
+
+.fab-btn:active {
+  opacity: 0.85;
+}
+</style>
--- a/frontend/src/pages/group/search.vue
+++ b/frontend/src/pages/group/search.vue
@@ -0,0 +1,466 @@
+<!--
+  搜索群聊页
+
+  设计系统：design-system/echochat/MASTER.md
+  色板：Primary #2563EB / BG #F8FAFC / Surface #F1F5F9 / Text #1E293B
+  功能：搜索公开群聊、查看群信息、申请加入群聊
+-->
+<template>
+  <view class="page-wrapper">
+    <!-- 搜索栏 -->
+    <view class="search-bar">
+      <view class="search-input-wrap">
+        <uni-icons type="search" size="18" color="#94A3B8" />
+        <input
+          class="search-input"
+          v-model="keyword"
+          placeholder="输入群名称搜索"
+          placeholder-style="color: #94A3B8"
+          confirm-type="search"
+          @confirm="doSearch"
+        />
+        <view v-if="keyword" class="search-clear" @tap="keyword = ''">
+          <uni-icons type="clear" size="16" color="#94A3B8" />
+        </view>
+      </view>
+      <view class="search-btn" @tap="doSearch">
+        <text class="search-btn-text">搜索</text>
+      </view>
+    </view>
+
+    <!-- 搜索结果 -->
+    <view v-if="searched" class="result-section">
+      <view class="section-header">
+        <text class="section-title">搜索结果</text>
+      </view>
+
+      <!-- 加载中 -->
+      <view v-if="searchLoading && page === 1" class="loading-wrap">
+        <text class="loading-text">搜索中...</text>
+      </view>
+
+      <!-- 结果列表 -->
+      <scroll-view
+        v-else-if="resultList.length > 0"
+        class="result-scroll"
+        scroll-y
+        @scrolltolower="loadMore"
+      >
+        <view class="result-list">
+          <view
+            v-for="group in resultList"
+            :key="group.id"
+            class="group-item"
+          >
+            <image
+              v-if="group.avatar"
+              class="group-avatar"
+              :src="group.avatar"
+              mode="aspectFill"
+            />
+            <view
+              v-else
+              class="group-avatar group-avatar-placeholder"
+              :style="{ backgroundColor: getAvatarColor(group.name) }"
+            >
+              <text class="avatar-char">{{ getInitial(group.name) }}</text>
+            </view>
+
+            <view class="group-info">
+              <text class="group-name">{{ group.name }}</text>
+              <text class="group-meta">{{ group.member_count || 0 }} 名成员</text>
+              <text v-if="group.description" class="group-desc">{{ group.description }}</text>
+            </view>
+
+            <view
+              class="action-btn action-btn--apply"
+              :class="{ 'action-btn--disabled': appliedMap[group.id] }"
+              @tap="showApplyDialog(group)"
+            >
+              <text class="action-btn-text action-btn-text--apply">
+                {{ appliedMap[group.id] ? '已申请' : '申请加入' }}
+              </text>
+            </view>
+          </view>
+        </view>
+
+        <!-- 底部加载状态 -->
+        <view class="load-more-wrap">
+          <text v-if="loadingMore" class="load-more-text">加载中...</text>
+          <text v-else-if="noMore" class="load-more-text">没有更多了</text>
+        </view>
+      </scroll-view>
+
+      <!-- 无结果 -->
+      <view v-else class="empty-state">
+        <uni-icons type="search" size="48" color="#CBD5E1" />
+        <text class="empty-text">未找到相关群聊</text>
+      </view>
+    </view>
+
+    <!-- 未搜索提示 -->
+    <view v-else class="hint-section">
+      <uni-icons type="search" size="48" color="#CBD5E1" />
+      <text class="hint-text">输入关键词搜索群聊</text>
+    </view>
+  </view>
+</template>
+
+<script>
+import { onLoad } from '@dcloudio/uni-app'
+import { ref, computed, reactive } from 'vue'
+import { useGroupStore } from '@/store/group'
+import { getAvatarColor, getInitial } from '@/utils/avatar'
+
+export default {
+  name: 'GroupSearch',
+  setup() {
+    const groupStore = useGroupStore()
+
+    const keyword = ref('')
+    const searched = ref(false)
+    const searchLoading = ref(false)
+    const loadingMore = ref(false)
+    const page = ref(1)
+    const pageSize = 20
+    const appliedMap = reactive({})
+
+    /** 搜索结果列表 */
+    const resultList = computed(() => groupStore.searchResults)
+
+    /** 是否还有更多数据 */
+    const noMore = computed(() => {
+      return resultList.value.length >= groupStore.searchTotal && groupStore.searchTotal > 0
+    })
+
+    // ==================== 生命周期 ====================
+
+    onLoad(() => {
+      groupStore.searchResults = []
+      groupStore.searchTotal = 0
+    })
+
+    // ==================== 搜索逻辑 ====================
+
+    /** 执行搜索 */
+    const doSearch = async () => {
+      const kw = keyword.value.trim()
+      if (!kw) {
+        uni.showToast({ title: '请输入搜索关键词', icon: 'none' })
+        return
+      }
+
+      searched.value = true
+      searchLoading.value = true
+      page.value = 1
+
+      try {
+        await groupStore.searchGroups(kw, 1, pageSize)
+      } catch (e) {
+        console.error('搜索群聊失败', e)
+        uni.showToast({ title: e?.data?.message || '搜索失败', icon: 'none' })
+      }
+
+      searchLoading.value = false
+    }
+
+    /** 滚动加载更多 */
+    const loadMore = async () => {
+      if (loadingMore.value || noMore.value || !searched.value) return
+
+      loadingMore.value = true
+      page.value += 1
+
+      try {
+        await groupStore.searchGroups(keyword.value.trim(), page.value, pageSize, true)
+      } catch (e) {
+        console.error('加载更多群聊失败', e)
+        page.value -= 1
+      }
+
+      loadingMore.value = false
+    }
+
+    // ==================== 申请加入 ====================
+
+    /** 弹出申请附言输入框 */
+    const showApplyDialog = (group) => {
+      if (appliedMap[group.id]) return
+
+      uni.showModal({
+        title: `申请加入「${group.name}」`,
+        editable: true,
+        placeholderText: '请输入申请附言（可选）',
+        content: '',
+        success: async (res) => {
+          if (res.confirm) {
+            try {
+              await groupStore.submitJoinRequest(group.id, res.content || '')
+              appliedMap[group.id] = true
+              uni.showToast({ title: '申请已发送', icon: 'success' })
+            } catch (e) {
+              console.error('发送入群申请失败', e)
+              uni.showToast({ title: e?.data?.message || '申请失败', icon: 'none' })
+            }
+          }
+        }
+      })
+    }
+
+    return {
+      keyword,
+      searched,
+      searchLoading,
+      loadingMore,
+      page,
+      resultList,
+      noMore,
+      appliedMap,
+      doSearch,
+      loadMore,
+      showApplyDialog,
+      getAvatarColor,
+      getInitial
+    }
+  }
+}
+</script>
+
+<style scoped>
+.page-wrapper {
+  min-height: 100vh;
+  background-color: #F8FAFC;
+  padding-bottom: env(safe-area-inset-bottom);
+}
+
+/* ===== 搜索栏 ===== */
+.search-bar {
+  display: flex;
+  align-items: center;
+  padding: 16rpx 24rpx;
+  background-color: #FFFFFF;
+  gap: 16rpx;
+  border-bottom: 1rpx solid #E2E8F0;
+}
+
+.search-input-wrap {
+  flex: 1;
+  background-color: #F1F5F9;
+  border-radius: 36rpx;
+  padding: 0 24rpx;
+  height: 72rpx;
+  display: flex;
+  align-items: center;
+  gap: 12rpx;
+}
+
+.search-input {
+  flex: 1;
+  font-size: 28rpx;
+  color: #1E293B;
+  height: 72rpx;
+}
+
+.search-clear {
+  flex-shrink: 0;
+  padding: 8rpx;
+}
+
+.search-btn {
+  padding: 0 28rpx;
+  height: 72rpx;
+  background-color: #2563EB;
+  border-radius: 16rpx;
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  cursor: pointer;
+  transition: opacity 200ms ease;
+}
+
+.search-btn:active {
+  opacity: 0.8;
+}
+
+.search-btn-text {
+  font-size: 28rpx;
+  color: #FFFFFF;
+  font-weight: 500;
+}
+
+/* ===== 区块标题 ===== */
+.section-header {
+  padding: 20rpx 32rpx;
+}
+
+.section-title {
+  font-size: 26rpx;
+  color: #94A3B8;
+  font-weight: 500;
+}
+
+/* ===== 加载状态 ===== */
+.loading-wrap {
+  padding: 80rpx 0;
+  display: flex;
+  align-items: center;
+  justify-content: center;
+}
+
+.loading-text {
+  font-size: 28rpx;
+  color: #94A3B8;
+}
+
+/* ===== 搜索结果滚动区域 ===== */
+.result-scroll {
+  height: calc(100vh - 200rpx);
+}
+
+/* ===== 结果列表 ===== */
+.result-list {
+  background-color: #FFFFFF;
+}
+
+.group-item {
+  display: flex;
+  align-items: center;
+  padding: 24rpx 32rpx;
+  border-bottom: 1rpx solid #F1F5F9;
+  gap: 20rpx;
+}
+
+.group-item:last-child {
+  border-bottom: none;
+}
+
+/* ===== 群头像 ===== */
+.group-avatar {
+  width: 88rpx;
+  height: 88rpx;
+  border-radius: 24rpx;
+  flex-shrink: 0;
+}
+
+.group-avatar-placeholder {
+  display: flex;
+  align-items: center;
+  justify-content: center;
+}
+
+.avatar-char {
+  color: #FFFFFF;
+  font-size: 32rpx;
+  font-weight: 600;
+}
+
+/* ===== 群信息 ===== */
+.group-info {
+  flex: 1;
+  display: flex;
+  flex-direction: column;
+  gap: 6rpx;
+  min-width: 0;
+}
+
+.group-name {
+  font-size: 30rpx;
+  color: #1E293B;
+  font-weight: 500;
+  overflow: hidden;
+  text-overflow: ellipsis;
+  white-space: nowrap;
+}
+
+.group-meta {
+  font-size: 24rpx;
+  color: #94A3B8;
+}
+
+.group-desc {
+  font-size: 24rpx;
+  color: #64748B;
+  overflow: hidden;
+  text-overflow: ellipsis;
+  white-space: nowrap;
+}
+
+/* ===== 操作按钮 ===== */
+.action-btn {
+  padding: 12rpx 24rpx;
+  border-radius: 12rpx;
+  flex-shrink: 0;
+  cursor: pointer;
+  transition: opacity 200ms ease;
+}
+
+.action-btn:active {
+  opacity: 0.8;
+}
+
+.action-btn--apply {
+  border: 2rpx solid #2563EB;
+  background-color: transparent;
+}
+
+.action-btn--disabled {
+  border-color: #CBD5E1;
+  pointer-events: none;
+}
+
+.action-btn-text {
+  font-size: 24rpx;
+  font-weight: 500;
+}
+
+.action-btn-text--apply {
+  color: #2563EB;
+}
+
+.action-btn--disabled .action-btn-text--apply {
+  color: #94A3B8;
+}
+
+/* ===== 加载更多 ===== */
+.load-more-wrap {
+  padding: 24rpx 0 40rpx;
+  display: flex;
+  align-items: center;
+  justify-content: center;
+}
+
+.load-more-text {
+  font-size: 24rpx;
+  color: #94A3B8;
+}
+
+/* ===== 空状态 ===== */
+.empty-state {
+  display: flex;
+  flex-direction: column;
+  align-items: center;
+  justify-content: center;
+  padding-top: 200rpx;
+  gap: 16rpx;
+}
+
+.empty-text {
+  font-size: 28rpx;
+  color: #94A3B8;
+}
+
+/* ===== 未搜索提示 ===== */
+.hint-section {
+  display: flex;
+  flex-direction: column;
+  align-items: center;
+  justify-content: center;
+  padding-top: 300rpx;
+  gap: 16rpx;
+}
+
+.hint-text {
+  font-size: 28rpx;
+  color: #94A3B8;
+}
+</style>
--- a/frontend/src/pages/group/settings.vue
+++ b/frontend/src/pages/group/settings.vue
@@ -0,0 +1,538 @@
+<!--
+  群设置页
+
+  设计系统：design-system/echochat/MASTER.md
+  色板：Primary #2563EB / BG #F8FAFC / Surface #F1F5F9 / Text #1E293B
+  功能：群信息展示/编辑、成员概览、免打扰、解散/退出群聊
+-->
+<template>
+  <view class="page-wrapper">
+    <!-- 群头像 + 群名称 -->
+    <view class="group-card">
+      <view class="group-avatar-wrap" @tap="onChangeAvatar">
+        <image v-if="groupAvatar" class="group-avatar" :src="groupAvatar" mode="aspectFill" />
+        <view v-else class="group-avatar group-avatar-placeholder" :style="{ backgroundColor: getAvatarColor(groupName) }">
+          <text class="avatar-text">{{ getInitial(groupName) }}</text>
+        </view>
+        <view v-if="isOwnerOrAdmin" class="avatar-edit-badge">
+          <uni-icons type="camera-filled" size="14" color="#FFFFFF" />
+        </view>
+      </view>
+      <text class="group-name">{{ groupName || '群聊' }}</text>
+      <text class="group-id">群ID: {{ groupId }}</text>
+    </view>
+
+    <!-- 群公告 -->
+    <view class="settings-group">
+      <view class="settings-item" @tap="onEditAnnouncement">
+        <text class="settings-label">群公告</text>
+        <view class="settings-right">
+          <text class="settings-value settings-value-ellipsis">{{ currentGroup?.notice || '暂无公告' }}</text>
+          <uni-icons v-if="isOwnerOrAdmin" type="forward" size="16" color="#94A3B8" />
+        </view>
+      </view>
+    </view>
+
+    <!-- 成员概览 -->
+    <view class="settings-group">
+      <view class="section-header">
+        <text class="section-title">群成员（{{ currentMembers.length }}）</text>
+        <view class="section-action" @tap="goToMembers">
+          <text class="section-action-text">查看全部</text>
+          <uni-icons type="forward" size="14" color="#2563EB" />
+        </view>
+      </view>
+      <scroll-view class="member-preview-scroll" scroll-x>
+        <view class="member-preview-list">
+          <view
+            v-for="member in previewMembers"
+            :key="member.user_id"
+            class="member-preview-item"
+          >
+            <image
+              v-if="member.avatar"
+              class="member-preview-avatar"
+              :src="member.avatar"
+              mode="aspectFill"
+            />
+            <view
+              v-else
+              class="member-preview-avatar member-preview-avatar-placeholder"
+              :style="{ backgroundColor: getAvatarColor(member.nickname || member.username) }"
+            >
+              <text class="member-preview-char">{{ getInitial(member.nickname || member.username) }}</text>
+            </view>
+            <text class="member-preview-name">{{ member.nickname || member.username }}</text>
+          </view>
+        </view>
+      </scroll-view>
+    </view>
+
+    <!-- 功能区 -->
+    <view class="settings-group">
+      <view class="settings-item" @tap="onEditGroupName">
+        <text class="settings-label">群名称</text>
+        <view class="settings-right">
+          <text class="settings-value">{{ groupName }}</text>
+          <uni-icons v-if="isOwnerOrAdmin" type="forward" size="16" color="#94A3B8" />
+        </view>
+      </view>
+      <view class="settings-item" @tap="onEditNickname">
+        <text class="settings-label">我在本群的昵称</text>
+        <view class="settings-right">
+          <text class="settings-value">{{ myNickname || '未设置' }}</text>
+          <uni-icons type="forward" size="16" color="#94A3B8" />
+        </view>
+      </view>
+      <view class="settings-item">
+        <text class="settings-label">消息免打扰</text>
+        <switch
+          :checked="isDoNotDisturb"
+          color="#2563EB"
+          style="transform: scale(0.8);"
+          @change="onToggleDND"
+        />
+      </view>
+    </view>
+
+    <!-- 危险操作区 -->
+    <view class="settings-group">
+      <view v-if="isOwner" class="settings-item settings-danger" @tap="onDissolve">
+        <text class="settings-label-danger">解散群聊</text>
+      </view>
+      <view v-else class="settings-item settings-danger" @tap="onLeave">
+        <text class="settings-label-danger">退出群聊</text>
+      </view>
+    </view>
+  </view>
+</template>
+
+<script>
+import { onLoad } from '@dcloudio/uni-app'
+import { ref, computed } from 'vue'
+import { useGroupStore } from '@/store/group'
+import { useUserStore } from '@/store/user'
+import { getAvatarColor, getInitial } from '@/utils/avatar'
+import { GROUP_ROLE } from '@/constants/group'
+
+export default {
+  name: 'GroupSettings',
+  setup() {
+    const groupStore = useGroupStore()
+    const userStore = useUserStore()
+
+    const groupId = ref(0)
+    const conversationId = ref(0)
+    const groupName = ref('')
+    const groupAvatar = ref('')
+    const isDoNotDisturb = ref(false)
+
+    const currentGroup = computed(() => groupStore.currentGroup)
+    const currentMembers = computed(() => groupStore.currentMembers)
+    const myId = computed(() => Number(userStore.userInfo?.id) || 0)
+
+    /** 成员概览：最多显示前 5 个 */
+    const previewMembers = computed(() => {
+      return currentMembers.value.slice(0, 5)
+    })
+
+    /** 当前用户在群中的成员信息 */
+    const myMember = computed(() => {
+      return currentMembers.value.find(m => m.user_id === myId.value)
+    })
+
+    /** 我在本群的昵称 */
+    const myNickname = computed(() => {
+      return myMember.value?.nickname || ''
+    })
+
+    /** 当前用户是否为群主 */
+    const isOwner = computed(() => {
+      return myMember.value?.role === GROUP_ROLE.OWNER
+    })
+
+    /** 当前用户是否为群主或管理员 */
+    const isOwnerOrAdmin = computed(() => {
+      const role = myMember.value?.role
+      return role === GROUP_ROLE.OWNER || role === GROUP_ROLE.ADMIN
+    })
+
+    // ==================== 生命周期 ====================
+
+    onLoad((query) => {
+      groupId.value = parseInt(query.groupId) || 0
+      conversationId.value = parseInt(query.conversationId) || 0
+      groupName.value = decodeURIComponent(query.peerName || '')
+      groupAvatar.value = decodeURIComponent(query.peerAvatar || '')
+
+      if (groupId.value) {
+        groupStore.fetchGroupDetail(groupId.value).then((detail) => {
+          if (detail) {
+            groupName.value = detail.name || groupName.value
+            groupAvatar.value = detail.avatar || groupAvatar.value
+          }
+        })
+        groupStore.fetchMembers(groupId.value)
+      }
+    })
+
+    // ==================== 编辑群名称 ====================
+
+    const onEditGroupName = () => {
+      if (!isOwnerOrAdmin.value) return
+      uni.showModal({
+        title: '修改群名称',
+        editable: true,
+        placeholderText: '请输入新群名称',
+        content: groupName.value,
+        success: async (res) => {
+          if (res.confirm && res.content && res.content.trim()) {
+            try {
+              await groupStore.updateGroup(groupId.value, { name: res.content.trim() })
+              groupName.value = res.content.trim()
+              uni.showToast({ title: '修改成功', icon: 'success' })
+            } catch (e) {
+              uni.showToast({ title: e?.data?.message || '修改失败', icon: 'none' })
+            }
+          }
+        }
+      })
+    }
+
+    // ==================== 编辑群公告 ====================
+
+    const onEditAnnouncement = () => {
+      if (!isOwnerOrAdmin.value) return
+      uni.showModal({
+        title: '修改群公告',
+        editable: true,
+        placeholderText: '请输入群公告',
+        content: currentGroup.value?.notice || '',
+        success: async (res) => {
+          if (res.confirm) {
+            try {
+              await groupStore.updateGroup(groupId.value, { notice: res.content || '' })
+              uni.showToast({ title: '修改成功', icon: 'success' })
+            } catch (e) {
+              uni.showToast({ title: e?.data?.message || '修改失败', icon: 'none' })
+            }
+          }
+        }
+      })
+    }
+
+    // ==================== 修改群头像（占位，仅群主/管理员） ====================
+
+    const onChangeAvatar = () => {
+      if (!isOwnerOrAdmin.value) return
+      uni.showToast({ title: '头像修改功能即将开放', icon: 'none' })
+    }
+
+    // ==================== 修改我的群昵称 ====================
+
+    const onEditNickname = () => {
+      uni.showModal({
+        title: '修改群昵称',
+        editable: true,
+        placeholderText: '请输入群昵称',
+        content: myNickname.value,
+        success: async (res) => {
+          if (res.confirm && res.content !== undefined) {
+            try {
+              await groupStore.updateNickname(groupId.value, res.content.trim())
+              groupStore.fetchMembers(groupId.value)
+              uni.showToast({ title: '修改成功', icon: 'success' })
+            } catch (e) {
+              uni.showToast({ title: e?.data?.message || '修改失败', icon: 'none' })
+            }
+          }
+        }
+      })
+    }
+
+    // ==================== 免打扰 ====================
+
+    const onToggleDND = async (e) => {
+      const newVal = e.detail.value
+      try {
+        await groupStore.setDoNotDisturb(conversationId.value, newVal)
+        isDoNotDisturb.value = newVal
+      } catch {
+        isDoNotDisturb.value = !newVal
+        uni.showToast({ title: '设置失败', icon: 'none' })
+      }
+    }
+
+    // ==================== 解散群聊（仅群主） ====================
+
+    const onDissolve = () => {
+      uni.showModal({
+        title: '解散群聊',
+        content: '确定要解散该群聊吗？此操作不可撤回，所有群成员将被移除。',
+        confirmColor: '#EF4444',
+        success: async (res) => {
+          if (res.confirm) {
+            try {
+              await groupStore.dissolveGroup(groupId.value)
+              uni.showToast({ title: '群聊已解散', icon: 'success' })
+              setTimeout(() => {
+                uni.switchTab({ url: '/pages/chat/index' })
+              }, 500)
+            } catch (e) {
+              uni.showToast({ title: e?.data?.message || '解散失败', icon: 'none' })
+            }
+          }
+        }
+      })
+    }
+
+    // ==================== 退出群聊（非群主） ====================
+
+    const onLeave = () => {
+      uni.showModal({
+        title: '退出群聊',
+        content: '确定要退出该群聊吗？退出后将不再接收该群消息。',
+        confirmColor: '#EF4444',
+        success: async (res) => {
+          if (res.confirm) {
+            try {
+              await groupStore.leaveGroup(groupId.value)
+              uni.showToast({ title: '已退出群聊', icon: 'success' })
+              setTimeout(() => {
+                uni.switchTab({ url: '/pages/chat/index' })
+              }, 500)
+            } catch (e) {
+              uni.showToast({ title: e?.data?.message || '退出失败', icon: 'none' })
+            }
+          }
+        }
+      })
+    }
+
+    // ==================== 导航 ====================
+
+    const goToMembers = () => {
+      uni.navigateTo({
+        url: `/pages/group/members?groupId=${groupId.value}`
+      })
+    }
+
+    return {
+      groupId,
+      groupName,
+      groupAvatar,
+      isDoNotDisturb,
+      currentGroup,
+      currentMembers,
+      previewMembers,
+      myNickname,
+      isOwner,
+      isOwnerOrAdmin,
+      onEditGroupName,
+      onEditAnnouncement,
+      onChangeAvatar,
+      onEditNickname,
+      onToggleDND,
+      onDissolve,
+      onLeave,
+      goToMembers,
+      getAvatarColor,
+      getInitial
+    }
+  }
+}
+</script>
+
+<style scoped>
+.page-wrapper {
+  min-height: 100vh;
+  background-color: #F1F5F9;
+}
+
+/* ===== 群信息卡片 ===== */
+.group-card {
+  display: flex;
+  flex-direction: column;
+  align-items: center;
+  padding: 48rpx 32rpx;
+  background-color: #FFFFFF;
+  margin-bottom: 16rpx;
+}
+
+.group-avatar-wrap {
+  position: relative;
+  margin-bottom: 20rpx;
+}
+
+.group-avatar {
+  width: 120rpx;
+  height: 120rpx;
+  border-radius: 30rpx;
+}
+
+.group-avatar-placeholder {
+  display: flex;
+  align-items: center;
+  justify-content: center;
+}
+
+.avatar-text {
+  color: #FFFFFF;
+  font-size: 48rpx;
+  font-weight: 600;
+}
+
+.avatar-edit-badge {
+  position: absolute;
+  bottom: -4rpx;
+  right: -4rpx;
+  width: 40rpx;
+  height: 40rpx;
+  border-radius: 50%;
+  background-color: #2563EB;
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  border: 3rpx solid #FFFFFF;
+}
+
+.group-name {
+  font-size: 34rpx;
+  font-weight: 600;
+  color: #1E293B;
+  margin-bottom: 8rpx;
+}
+
+.group-id {
+  font-size: 24rpx;
+  color: #94A3B8;
+}
+
+/* ===== 区块通用 ===== */
+.settings-group {
+  background-color: #FFFFFF;
+  margin-bottom: 16rpx;
+}
+
+.settings-item {
+  display: flex;
+  align-items: center;
+  justify-content: space-between;
+  padding: 32rpx;
+  min-height: 88rpx;
+  border-bottom: 1rpx solid #F1F5F9;
+  transition: background-color 150ms ease;
+}
+
+.settings-item:last-child {
+  border-bottom: none;
+}
+
+.settings-item:active {
+  background-color: #F8FAFC;
+}
+
+.settings-label {
+  font-size: 30rpx;
+  color: #1E293B;
+  flex-shrink: 0;
+}
+
+.settings-right {
+  display: flex;
+  align-items: center;
+  gap: 8rpx;
+  min-width: 0;
+  flex: 1;
+  justify-content: flex-end;
+}
+
+.settings-value {
+  font-size: 26rpx;
+  color: #94A3B8;
+}
+
+.settings-value-ellipsis {
+  max-width: 400rpx;
+  overflow: hidden;
+  text-overflow: ellipsis;
+  white-space: nowrap;
+}
+
+.settings-label-danger {
+  font-size: 30rpx;
+  color: #EF4444;
+}
+
+/* ===== 成员概览区 ===== */
+.section-header {
+  display: flex;
+  align-items: center;
+  justify-content: space-between;
+  padding: 20rpx 32rpx 12rpx;
+}
+
+.section-title {
+  font-size: 26rpx;
+  color: #94A3B8;
+  font-weight: 500;
+}
+
+.section-action {
+  display: flex;
+  align-items: center;
+  gap: 4rpx;
+}
+
+.section-action-text {
+  font-size: 24rpx;
+  color: #2563EB;
+}
+
+.member-preview-scroll {
+  white-space: nowrap;
+  padding: 16rpx 32rpx 24rpx;
+}
+
+.member-preview-list {
+  display: flex;
+  gap: 24rpx;
+}
+
+.member-preview-item {
+  display: flex;
+  flex-direction: column;
+  align-items: center;
+  width: 96rpx;
+  flex-shrink: 0;
+}
+
+.member-preview-avatar {
+  width: 80rpx;
+  height: 80rpx;
+  border-radius: 20rpx;
+}
+
+.member-preview-avatar-placeholder {
+  display: flex;
+  align-items: center;
+  justify-content: center;
+}
+
+.member-preview-char {
+  color: #FFFFFF;
+  font-size: 28rpx;
+  font-weight: 600;
+}
+
+.member-preview-name {
+  font-size: 22rpx;
+  color: #475569;
+  margin-top: 8rpx;
+  max-width: 96rpx;
+  overflow: hidden;
+  text-overflow: ellipsis;
+  white-space: nowrap;
+  text-align: center;
+}
+</style>
--- a/frontend/src/store/chat.js
+++ b/frontend/src/store/chat.js
@@ -40,6 +40,12 @@ export const useChatStore = defineStore('chat', () => {
  /** 是否还有更多历史消息 conversationId -> boolean */
  const hasMoreMap = ref({})

+  /** 单聊已读状态：conversationId -> lastReadMsgId（对方已读到的消息 ID） */
+  const readStatusMap = ref({})
+
+  /** 群聊已读计数：messageId -> readCount */
+  const groupReadCountMap = ref({})
+
  // ==================== Computed ====================

  /** 当前会话的消息列表（conversationId 为 null 时取 pending 队列） */
@@ -85,7 +91,7 @@ export const useChatStore = defineStore('chat', () => {
   */
  const sendMessage = (params) => {
    const clientMsgId = _generateClientMsgId()
-    const { conversationId, targetUserId, content, type = 1 } = params
+    const { conversationId, targetUserId, content, type = 1, at_user_ids } = params
    const userStore = useUserStore()

    const tempMsg = {
@@ -105,13 +111,18 @@ export const useChatStore = defineStore('chat', () => {

    pendingMessages.value[clientMsgId] = { status: 'sending', tempMsg }

-    const seq = wsService.send('im.message.send', {
+    const payload = {
      conversation_id: conversationId || 0,
      target_user_id: targetUserId || 0,
      type,
      content,
      client_msg_id: clientMsgId
-    })
+    }
+    if (at_user_ids && at_user_ids.length > 0) {
+      payload.at_user_ids = at_user_ids
+    }
+
+    const seq = wsService.send('im.message.send', payload)

    if (seq === -1) {
      pendingMessages.value[clientMsgId].status = 'failed'
@@ -209,6 +220,8 @@ export const useChatStore = defineStore('chat', () => {
    wsService.on('im.message.send.ack', _onSendACK)
    wsService.on('im.offline.sync', _onOfflineSync)
    wsService.on('im.typing', _onTyping)
+    wsService.on('im.message.read.ack', _onReadACK)
+    wsService.on('im.message.read.count', _onReadCount)
  }

  /** 收到新消息推送 */
@@ -311,6 +324,29 @@ export const useChatStore = defineStore('chat', () => {
    fetchConversations()
  }

+  /** 单聊已读确认（对方已读到某条消息） */
+  const _onReadACK = (msg) => {
+    if (!msg || !msg.data) return
+    const { conversation_id, last_read_msg_id } = msg.data
+    readStatusMap.value[conversation_id] = last_read_msg_id
+  }
+
+  /** 群聊已读计数更新 */
+  const _onReadCount = (msg) => {
+    if (!msg || !msg.data) return
+    const { message_id, read_count } = msg.data
+    groupReadCountMap.value[message_id] = read_count
+  }
+
+  /** 群聊标记已读（发送 WS 事件） */
+  const markGroupRead = (conversationId, messageIds) => {
+    if (!messageIds || messageIds.length === 0) return
+    wsService.send('im.group.read', {
+      conversation_id: conversationId,
+      message_ids: messageIds
+    })
+  }
+
  /** 正在输入通知 */
  const _onTyping = (msg) => {
    if (!msg || !msg.data) return
@@ -366,6 +402,8 @@ export const useChatStore = defineStore('chat', () => {
    totalUnread,
    typingMap,
    hasMoreMap,
+    readStatusMap,
+    groupReadCountMap,
    currentMessages,
    sortedConversations,
    fetchConversations,
@@ -373,6 +411,7 @@ export const useChatStore = defineStore('chat', () => {
    sendMessage,
    recallMessage,
    markRead,
+    markGroupRead,
    sendTyping,
    loadHistoryMessages,
    pinConversation,
--- a/frontend/src/store/group.js
+++ b/frontend/src/store/group.js
@@ -0,0 +1,328 @@
+/**
+ * 群聊状态 Store
+ *
+ * 管理群聊信息、群成员、入群申请，提供：
+ * - 当前群详情和成员列表
+ * - 群管理操作（邀请/踢人/禁言/设管理员/解散等）
+ * - WebSocket 群管理事件监听（group.* 系列）
+ *
+ * 对应后端 API：/api/v1/groups/*
+ * 对应 WS 事件：group.created / group.member.join / group.member.leave / group.member.kicked
+ *               group.info.update / group.dissolved / group.mute.update / group.role.update
+ *               group.owner.transfer / group.join.request / group.join.approved
+ */
+
+import { defineStore } from 'pinia'
+import { ref } from 'vue'
+import groupApi from '@/api/group'
+import wsService from '@/services/websocket'
+import { useChatStore } from '@/store/chat'
+
+export const useGroupStore = defineStore('group', () => {
+  /** 当前查看的群详情 */
+  const currentGroup = ref(null)
+
+  /** 当前群的成员列表 */
+  const currentMembers = ref([])
+
+  /** 当前群的入群申请列表 */
+  const joinRequests = ref([])
+
+  /** 群搜索结果 */
+  const searchResults = ref([])
+  const searchTotal = ref(0)
+
+  // ==================== Actions：群信息 ====================
+
+  /** 获取群详情 */
+  const fetchGroupDetail = async (groupId) => {
+    const res = await groupApi.getGroupDetail(groupId)
+    if (res.data) {
+      currentGroup.value = res.data
+    }
+    return currentGroup.value
+  }
+
+  /** 创建群聊 */
+  const createGroup = async (name, memberIds, avatar = '') => {
+    const res = await groupApi.createGroup(name, memberIds, avatar)
+    return res.data
+  }
+
+  /** 更新群信息 */
+  const updateGroup = async (groupId, data) => {
+    await groupApi.updateGroup(groupId, data)
+    if (currentGroup.value && currentGroup.value.id === groupId) {
+      Object.assign(currentGroup.value, data)
+    }
+  }
+
+  /** 解散群聊 */
+  const dissolveGroup = async (groupId) => {
+    await groupApi.dissolveGroup(groupId)
+    currentGroup.value = null
+  }
+
+  // ==================== Actions：群成员管理 ====================
+
+  /** 获取群成员列表 */
+  const fetchMembers = async (groupId) => {
+    const res = await groupApi.getMembers(groupId)
+    if (res.data) {
+      currentMembers.value = res.data.list || res.data || []
+    }
+    return currentMembers.value
+  }
+
+  /** 邀请入群 */
+  const inviteMembers = async (groupId, userIds) => {
+    await groupApi.inviteMembers(groupId, userIds)
+  }
+
+  /** 踢出群成员 */
+  const kickMember = async (groupId, userId) => {
+    await groupApi.kickMember(groupId, userId)
+    currentMembers.value = currentMembers.value.filter(m => m.user_id !== userId)
+  }
+
+  /** 退出群聊 */
+  const leaveGroup = async (groupId) => {
+    await groupApi.leaveGroup(groupId)
+    currentGroup.value = null
+  }
+
+  /** 转让群主 */
+  const transferOwner = async (groupId, newOwnerId) => {
+    await groupApi.transferOwner(groupId, newOwnerId)
+  }
+
+  /** 设置/取消管理员 */
+  const setMemberRole = async (groupId, userId, role) => {
+    await groupApi.setMemberRole(groupId, userId, role)
+    const member = currentMembers.value.find(m => m.user_id === userId)
+    if (member) member.role = role
+  }
+
+  /** 禁言/解除禁言 */
+  const muteMember = async (groupId, userId, isMuted) => {
+    await groupApi.muteMember(groupId, userId, isMuted)
+    const member = currentMembers.value.find(m => m.user_id === userId)
+    if (member) member.is_muted = isMuted
+  }
+
+  /** 全体禁言 */
+  const setAllMuted = async (groupId, isMuted) => {
+    await groupApi.setAllMuted(groupId, isMuted)
+    if (currentGroup.value && currentGroup.value.id === groupId) {
+      currentGroup.value.is_all_muted = isMuted
+    }
+  }
+
+  /** 修改群昵称 */
+  const updateNickname = async (groupId, nickname) => {
+    await groupApi.updateNickname(groupId, nickname)
+  }
+
+  /** 设置/取消免打扰 */
+  const setDoNotDisturb = async (conversationId, isDoNotDisturb) => {
+    await groupApi.setDoNotDisturb(conversationId, isDoNotDisturb)
+  }
+
+  // ==================== Actions：入群申请 ====================
+
+  /** 提交入群申请 */
+  const submitJoinRequest = async (groupId, message = '') => {
+    await groupApi.submitJoinRequest(groupId, message)
+  }
+
+  /** 获取入群申请列表 */
+  const fetchJoinRequests = async (groupId) => {
+    const res = await groupApi.getJoinRequests(groupId)
+    if (res.data) {
+      joinRequests.value = res.data.list || res.data || []
+    }
+    return joinRequests.value
+  }
+
+  /** 审批入群申请 */
+  const reviewJoinRequest = async (groupId, requestId, action) => {
+    await groupApi.reviewJoinRequest(groupId, requestId, action)
+    joinRequests.value = joinRequests.value.filter(r => r.id !== requestId)
+  }
+
+  // ==================== Actions：搜索 ====================
+
+  /**
+   * 搜索公开群
+   * @param {string} keyword - 搜索关键词
+   * @param {number} page - 页码
+   * @param {number} pageSize - 每页条数
+   * @param {boolean} append - 是否追加到现有列表（分页加载更多时为 true）
+   */
+  const searchGroups = async (keyword, page = 1, pageSize = 20, append = false) => {
+    const res = await groupApi.searchGroups(keyword, page, pageSize)
+    if (res.data) {
+      const newList = res.data.list || []
+      searchResults.value = append ? [...searchResults.value, ...newList] : newList
+      searchTotal.value = res.data.total || 0
+    }
+    return { list: searchResults.value, total: searchTotal.value }
+  }
+
+  // ==================== WS 事件监听 ====================
+
+  let _wsInitialized = false
+
+  /** 初始化 WebSocket 群管理事件监听（幂等） */
+  const initWsListeners = () => {
+    if (_wsInitialized) return
+    _wsInitialized = true
+
+    wsService.on('group.created', _onGroupCreated)
+    wsService.on('group.member.join', _onMemberJoin)
+    wsService.on('group.member.leave', _onMemberLeave)
+    wsService.on('group.member.kicked', _onMemberKicked)
+    wsService.on('group.info.update', _onInfoUpdate)
+    wsService.on('group.dissolved', _onDissolved)
+    wsService.on('group.mute.update', _onMuteUpdate)
+    wsService.on('group.role.update', _onRoleUpdate)
+    wsService.on('group.owner.transfer', _onOwnerTransfer)
+    wsService.on('group.join.request', _onJoinRequest)
+    wsService.on('group.join.approved', _onJoinApproved)
+  }
+
+  /** 群聊创建通知 → 刷新会话列表 */
+  const _onGroupCreated = () => {
+    const chatStore = useChatStore()
+    chatStore.fetchConversations()
+  }
+
+  /** 新成员加入 → 刷新成员和会话 */
+  const _onMemberJoin = (msg) => {
+    if (!msg || !msg.data) return
+    const { group_id } = msg.data
+    if (currentGroup.value && currentGroup.value.id === group_id) {
+      fetchMembers(group_id)
+    }
+    const chatStore = useChatStore()
+    chatStore.fetchConversations()
+  }
+
+  /** 成员退出 → 刷新成员 */
+  const _onMemberLeave = (msg) => {
+    if (!msg || !msg.data) return
+    const { group_id, user_id } = msg.data
+    if (currentGroup.value && currentGroup.value.id === group_id) {
+      currentMembers.value = currentMembers.value.filter(m => m.user_id !== user_id)
+    }
+  }
+
+  /** 成员被踢 → 刷新或跳转 */
+  const _onMemberKicked = (msg) => {
+    if (!msg || !msg.data) return
+    const { group_id, user_id } = msg.data
+    if (currentGroup.value && currentGroup.value.id === group_id) {
+      currentMembers.value = currentMembers.value.filter(m => m.user_id !== user_id)
+    }
+    const chatStore = useChatStore()
+    chatStore.fetchConversations()
+  }
+
+  /** 群信息变更 → 更新当前群详情 + 刷新会话 */
+  const _onInfoUpdate = (msg) => {
+    if (!msg || !msg.data) return
+    const { group_id, updates } = msg.data
+    if (currentGroup.value && currentGroup.value.id === group_id && updates) {
+      Object.assign(currentGroup.value, updates)
+    }
+    const chatStore = useChatStore()
+    chatStore.fetchConversations()
+  }
+
+  /** 群解散 → 清空当前群 + 刷新会话 */
+  const _onDissolved = (msg) => {
+    if (!msg || !msg.data) return
+    const { group_id } = msg.data
+    if (currentGroup.value && currentGroup.value.id === group_id) {
+      currentGroup.value = null
+      uni.showToast({ title: '该群已被解散', icon: 'none' })
+    }
+    const chatStore = useChatStore()
+    chatStore.fetchConversations()
+  }
+
+  /** 禁言变更 → 更新成员 / 群信息 */
+  const _onMuteUpdate = (msg) => {
+    if (!msg || !msg.data) return
+    const { group_id, user_id, is_muted, is_all_muted } = msg.data
+    if (currentGroup.value && currentGroup.value.id === group_id) {
+      if (is_all_muted !== undefined) {
+        currentGroup.value.is_all_muted = is_all_muted
+      }
+      if (user_id) {
+        const member = currentMembers.value.find(m => m.user_id === user_id)
+        if (member) member.is_muted = is_muted
+      }
+    }
+  }
+
+  /** 角色变更 → 更新成员角色 */
+  const _onRoleUpdate = (msg) => {
+    if (!msg || !msg.data) return
+    const { group_id, user_id, role } = msg.data
+    if (currentGroup.value && currentGroup.value.id === group_id) {
+      const member = currentMembers.value.find(m => m.user_id === user_id)
+      if (member) member.role = role
+    }
+  }
+
+  /** 群主转让 → 刷新群详情和成员 */
+  const _onOwnerTransfer = (msg) => {
+    if (!msg || !msg.data) return
+    const { group_id } = msg.data
+    if (currentGroup.value && currentGroup.value.id === group_id) {
+      fetchGroupDetail(group_id)
+      fetchMembers(group_id)
+    }
+  }
+
+  /** 新入群申请 → 提示通知 */
+  const _onJoinRequest = (msg) => {
+    if (!msg || !msg.data) return
+    uni.showToast({ title: '收到新的入群申请', icon: 'none' })
+  }
+
+  /** 入群申请通过 → 刷新会话列表 */
+  const _onJoinApproved = () => {
+    const chatStore = useChatStore()
+    chatStore.fetchConversations()
+    uni.showToast({ title: '入群申请已通过', icon: 'none' })
+  }
+
+  return {
+    currentGroup,
+    currentMembers,
+    joinRequests,
+    searchResults,
+    searchTotal,
+    fetchGroupDetail,
+    createGroup,
+    updateGroup,
+    dissolveGroup,
+    fetchMembers,
+    inviteMembers,
+    kickMember,
+    leaveGroup,
+    transferOwner,
+    setMemberRole,
+    muteMember,
+    setAllMuted,
+    updateNickname,
+    setDoNotDisturb,
+    submitJoinRequest,
+    fetchJoinRequests,
+    reviewJoinRequest,
+    searchGroups,
+    initWsListeners
+  }
+})