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/pkg/errorx/errorx.go

@@ -7,14 +7,14 @@ import (
 
 const (
 	// 通用错误代码
-	Success         = 0
-	ServerError     = 500
-	ParamError      = 400
-	AuthError       = 401
-	NotFound        = 404
-	Forbidden       = 403
-	InvalidParameter = 400  // 与 ParamError 统一
-	
+	Success          = 0
+	ServerError      = 500
+	ParamError       = 400
+	AuthError        = 401
+	NotFound         = 404
+	Forbidden        = 403
+	InvalidParameter = 400 // 与 ParamError 统一
+
 	// 业务错误代码
 	UserNotFound    = 1001
 	UserExists      = 1002
@@ -22,32 +22,32 @@ const (
 	InvalidPassword = 1004
 	TokenExpired    = 1005
 	TokenInvalid    = 1006
-	
+
 	PhotoNotFound   = 2001
 	PhotoUploadFail = 2002
-	
+
 	CategoryNotFound = 3001
 	CategoryExists   = 3002
 )
 
 var codeText = map[int]string{
-	Success:         "Success",
-	ServerError:     "Server Error",
-	ParamError:      "Parameter Error",  // ParamError 和 InvalidParameter 都映射到这里
-	AuthError:       "Authentication Error",
-	NotFound:        "Not Found",
-	Forbidden:       "Forbidden",
-	
+	Success:     "Success",
+	ServerError: "Server Error",
+	ParamError:  "Parameter Error", // ParamError 和 InvalidParameter 都映射到这里
+	AuthError:   "Authentication Error",
+	NotFound:    "Not Found",
+	Forbidden:   "Forbidden",
+
 	UserNotFound:    "User Not Found",
 	UserExists:      "User Already Exists",
 	UserDisabled:    "User Disabled",
 	InvalidPassword: "Invalid Password",
 	TokenExpired:    "Token Expired",
 	TokenInvalid:    "Token Invalid",
-	
+
 	PhotoNotFound:   "Photo Not Found",
 	PhotoUploadFail: "Photo Upload Failed",
-	
+
 	CategoryNotFound: "Category Not Found",
 	CategoryExists:   "Category Already Exists",
 }
@@ -83,7 +83,7 @@ func GetHttpStatus(code int) int {
 	switch code {
 	case Success:
 		return http.StatusOK
-	case ParamError:  // ParamError 和 InvalidParameter 都是 400，所以只需要一个 case
+	case ParamError: // ParamError 和 InvalidParameter 都是 400，所以只需要一个 case
 		return http.StatusBadRequest
 	case AuthError, TokenExpired, TokenInvalid:
 		return http.StatusUnauthorized
@@ -96,4 +96,4 @@ func GetHttpStatus(code int) int {
 	default:
 		return http.StatusInternalServerError
 	}
-}
+}