feat: 角色等级体系与权限管控实施

- 数据库：auth_roles 表新增 level 字段（1=超管, 10=管理员, 100=普通用户）
- 后端：新增 GetAllRoles/GetUserMaxLevel/SetUserRoles/FindByCodeList DAO 方法
- 后端：SetRolesRequest 替换 AssignRoleRequest，AdminUserInfo.Roles 改为 []RoleInfo
- 后端：所有管理操作（禁用/启用/角色分配/创建用户）强制层级权限校验
- 后端：PUT /users/:id/roles（批量设置角色）+ GET /roles（角色列表）
- 前端：角色管理改为 Checkbox Group 多选，高等级角色禁用
- 前端：禁用/启用按钮受角色层级约束，列表页操作按钮权限管控
- 前端：创建用户对话框角色选项根据操作者等级动态过滤
- 文档：API 文档、设计方案、集成规范、进度文档同步更新

Made-with: Cursor

design-system/echochat/pages/admin-user-detail.md

@@ -0,0 +1,52 @@
+# Admin User Detail Page Overrides
+
+> **PROJECT:** EchoChat
+> **Generated:** 2026-03-02 15:16:13
+> **Page Type:** Dashboard / Data View
+
+> ⚠️ **IMPORTANT:** Rules in this file **override** the Master file (`design-system/MASTER.md`).
+> Only deviations from the Master are documented here. For all other rules, refer to the Master.
+
+---
+
+## Page-Specific Rules
+
+### Layout Overrides
+
+- **Max Width:** 1200px (standard)
+- **Layout:** Full-width sections, centered content
+- **Sections:** 1. Intro (Vertical), 2. The Journey (Horizontal Track), 3. Detail Reveal, 4. Vertical Footer
+
+### Spacing Overrides
+
+- No overrides — use Master spacing
+
+### Typography Overrides
+
+- No overrides — use Master typography
+
+### Color Overrides
+
+- **Strategy:** Continuous palette transition. Chapter colors. Progress bar #000000.
+
+### Component Overrides
+
+- Avoid: Use for flat single-level sites
+- Avoid: Ignore accessibility motion settings
+- Avoid: Validate only on submit
+
+---
+
+## Page-Specific Components
+
+- No unique components for this page
+
+---
+
+## Recommendations
+
+- Effects: Funnel animation (fill-down), flow diagram animations (connection draw), conversion pulse, engagement bar fill
+- Navigation: Use for sites with 3+ levels of depth
+- Animation: Check prefers-reduced-motion media query
+- Forms: Validate on blur for most fields
+- CTA Placement: Floating Sticky CTA or End of Horizontal Track