fix: 错误返回码问题处理

backend/internal/api/handlers/auth_handler.go

@@ -40,8 +40,7 @@ func (h *AuthHandler) Login(c *gin.Context) {
 		lang := middleware.GetLanguage(c)
 		status, errCode, message := i18n.NewI18nErrorResponse("900001", lang)
 		c.JSON(status, models.ErrorResponse{
-			Code:      status,
-			Error:     errCode,
+			Code:      errCode,
 			Message:   message,
 			Timestamp: getCurrentTimestamp(),
 		})
@@ -58,8 +57,7 @@ func (h *AuthHandler) Login(c *gin.Context) {
 		lang := middleware.GetLanguage(c)
 		status, errCode, message := i18n.NewI18nErrorResponse(errorCode, lang, err.Error())
 		c.JSON(status, models.ErrorResponse{
-			Code:      status,
-			Error:     errCode,
+			Code:      errCode,
 			Message:   message,
 			Timestamp: getCurrentTimestamp(),
 		})
@@ -115,8 +113,7 @@ func (h *AuthHandler) RefreshToken(c *gin.Context) {
 		lang := middleware.GetLanguage(c)
 		status, errCode, message := i18n.NewI18nErrorResponse("100004", lang)
 		c.JSON(status, models.ErrorResponse{
-			Code:      status,
-			Error:     errCode,
+			Code:      errCode,
 			Message:   message,
 			Timestamp: getCurrentTimestamp(),
 		})
@@ -134,8 +131,7 @@ func (h *AuthHandler) RefreshToken(c *gin.Context) {
 		lang := middleware.GetLanguage(c)
 		status, errCode, message := i18n.NewI18nErrorResponse(errorCode, lang, err.Error())
 		c.JSON(status, models.ErrorResponse{
-			Code:      status,
-			Error:     errCode,
+			Code:      errCode,
 			Message:   message,
 			Timestamp: getCurrentTimestamp(),
 		})

backend/internal/models/common.go

@@ -10,8 +10,7 @@ type APIResponse struct {
 
 // ErrorResponse 错误响应结构
 type ErrorResponse struct {
-	Code      int    `json:"code"`      // HTTP状态码，如 401, 500
-	Error     string `json:"error"`     // 业务错误码，如 AUTH_001, LOGIN_FAILED
+	Code      string `json:"code"`      // 业务错误码，如 "100001", "900001"
 	Message   string `json:"message"`   // 错误描述信息
 	Timestamp string `json:"timestamp"` // 错误发生时间
 }