style: 统一代码格式化 (go fmt + 配置更新)

- 后端：应用 go fmt 自动格式化，统一代码风格
- 前端：更新 API 配置，完善类型安全
- 所有代码符合项目规范，准备生产部署

backend/internal/middleware/error.go

@@ -19,8 +19,8 @@ type ErrorConfig struct {
 	EnableDetailedErrors bool     // 是否启用详细错误信息 (开发环境)
 	EnableStackTrace     bool     // 是否启用堆栈跟踪
 	EnableErrorMonitor   bool     // 是否启用错误监控
-	IgnoreHTTPCodes     []int    // 忽略的HTTP状态码 (不记录为错误)
-	SensitiveFields     []string // 敏感字段列表 (日志时隐藏)
+	IgnoreHTTPCodes      []int    // 忽略的HTTP状态码 (不记录为错误)
+	SensitiveFields      []string // 敏感字段列表 (日志时隐藏)
 }
 
 // DefaultErrorConfig 默认错误配置
@@ -29,8 +29,8 @@ func DefaultErrorConfig() ErrorConfig {
 		EnableDetailedErrors: false, // 生产环境默认关闭
 		EnableStackTrace:     false, // 生产环境默认关闭
 		EnableErrorMonitor:   true,
-		IgnoreHTTPCodes:     []int{http.StatusNotFound, http.StatusMethodNotAllowed},
-		SensitiveFields:     []string{"password", "token", "secret", "key", "authorization"},
+		IgnoreHTTPCodes:      []int{http.StatusNotFound, http.StatusMethodNotAllowed},
+		SensitiveFields:      []string{"password", "token", "secret", "key", "authorization"},
 	}
 }
 
@@ -111,7 +111,7 @@ func (m *ErrorMiddleware) Handle(next http.HandlerFunc) http.HandlerFunc {
 // handlePanic 处理panic
 func (m *ErrorMiddleware) handlePanic(w *errorResponseWriter, r *http.Request, err interface{}) {
 	stack := string(debug.Stack())
-	
+
 	// 记录panic日志
 	logFields := map[string]interface{}{
 		"error":      err,
@@ -206,7 +206,7 @@ func (m *ErrorMiddleware) respondWithError(w http.ResponseWriter, r *http.Reques
 
 	// 设置HTTP状态码
 	httpStatus := errorx.GetHttpStatus(err.Code)
-	
+
 	// 设置响应头
 	w.Header().Set("Content-Type", "application/json")
 	w.WriteHeader(httpStatus)
@@ -218,10 +218,10 @@ func (m *ErrorMiddleware) respondWithError(w http.ResponseWriter, r *http.Reques
 // sanitizeFields 隐藏敏感字段
 func (m *ErrorMiddleware) sanitizeFields(data map[string]interface{}) map[string]interface{} {
 	sanitized := make(map[string]interface{})
-	
+
 	for key, value := range data {
 		lowerKey := strings.ToLower(key)
-		
+
 		// 检查是否为敏感字段
 		sensitive := false
 		for _, sensitiveField := range m.config.SensitiveFields {
@@ -230,7 +230,7 @@ func (m *ErrorMiddleware) sanitizeFields(data map[string]interface{}) map[string
 				break
 			}
 		}
-		
+
 		if sensitive {
 			sanitized[key] = "***REDACTED***"
 		} else {
@@ -242,7 +242,7 @@ func (m *ErrorMiddleware) sanitizeFields(data map[string]interface{}) map[string
 			}
 		}
 	}
-	
+
 	return sanitized
 }
 
@@ -322,4 +322,4 @@ var CommonErrors = struct {
 		Code: 429,
 		Msg:  "Rate Limit Exceeded",
 	},
-}
+}