feat(backend): Go 服务骨架（配置、日志、数据库、中间件、Wire）

- config: Viper YAML 配置 + 环境变量覆盖
- logs: zap 结构化日志 + trace_id 链路追踪 + 敏感信息脱敏
- db: PostgreSQL (GORM) + Redis (go-redis) 连接管理
- middleware: Trace/Logger/CORS/Recovery 四层中间件
- provider: Wire 编译时依赖注入
- main.go: 优雅启动/关闭 HTTP 服务

Made-with: Cursor

backend/go-service/pkg/utils/response.go

@@ -0,0 +1,91 @@
+// Package utils 提供通用工具函数
+package utils
+
+import (
+	"net/http"
+	"time"
+
+	"github.com/echochat/backend/pkg/logs"
+	"github.com/gin-gonic/gin"
+)
+
+// Response 统一 API 响应结构
+type Response struct {
+	Code    int         `json:"code"`
+	Message string      `json:"message"`
+	Data    interface{} `json:"data,omitempty"`
+	TraceID string      `json:"trace_id,omitempty"`
+	Time    string      `json:"time"`
+}
+
+// ResponseOK 成功响应 200
+func ResponseOK(c *gin.Context, data interface{}) {
+	c.JSON(http.StatusOK, Response{
+		Code:    0,
+		Message: "success",
+		Data:    data,
+		TraceID: logs.GetTraceID(c.Request.Context()),
+		Time:    time.Now().Format("2006-01-02 15:04:05"),
+	})
+}
+
+// ResponseCreated 创建成功响应 201
+func ResponseCreated(c *gin.Context, data interface{}) {
+	c.JSON(http.StatusCreated, Response{
+		Code:    0,
+		Message: "created",
+		Data:    data,
+		TraceID: logs.GetTraceID(c.Request.Context()),
+		Time:    time.Now().Format("2006-01-02 15:04:05"),
+	})
+}
+
+// ResponseBadRequest 参数错误响应 400
+func ResponseBadRequest(c *gin.Context, message string) {
+	c.JSON(http.StatusBadRequest, Response{
+		Code:    400,
+		Message: message,
+		TraceID: logs.GetTraceID(c.Request.Context()),
+		Time:    time.Now().Format("2006-01-02 15:04:05"),
+	})
+}
+
+// ResponseUnauthorized 未认证响应 401
+func ResponseUnauthorized(c *gin.Context, message string) {
+	c.JSON(http.StatusUnauthorized, Response{
+		Code:    401,
+		Message: message,
+		TraceID: logs.GetTraceID(c.Request.Context()),
+		Time:    time.Now().Format("2006-01-02 15:04:05"),
+	})
+}
+
+// ResponseForbidden 无权限响应 403
+func ResponseForbidden(c *gin.Context, message string) {
+	c.JSON(http.StatusForbidden, Response{
+		Code:    403,
+		Message: message,
+		TraceID: logs.GetTraceID(c.Request.Context()),
+		Time:    time.Now().Format("2006-01-02 15:04:05"),
+	})
+}
+
+// ResponseNotFound 资源不存在响应 404
+func ResponseNotFound(c *gin.Context, message string) {
+	c.JSON(http.StatusNotFound, Response{
+		Code:    404,
+		Message: message,
+		TraceID: logs.GetTraceID(c.Request.Context()),
+		Time:    time.Now().Format("2006-01-02 15:04:05"),
+	})
+}
+
+// ResponseError 服务器内部错误响应 500
+func ResponseError(c *gin.Context, message string) {
+	c.JSON(http.StatusInternalServerError, Response{
+		Code:    500,
+		Message: message,
+		TraceID: logs.GetTraceID(c.Request.Context()),
+		Time:    time.Now().Format("2006-01-02 15:04:05"),
+	})
+}