Update response types and utility functions

- Add `Code`, `Message`, and `StatusCode` fields to `SuccessResponse` and `FailResponse`
- Remove `RespErr` struct and directly include error details in `FailResponse`
- Modify `AssembleResponse` to use new response structure with standardized fields

internal/utils/types.go

@@ -4,12 +4,17 @@ type ResponseDataOptionFunc func(ev *SuccessResponse)
 
 type SuccessResponse struct {
 	APIVersion string      `json:"apiVersion"`
+	Code       string      `json:"code"`
+	Message    string      `json:"message"`
+	StatusCode int         `json:"status_code"`
 	Data       interface{} `json:"data"`
 }
 
 type FailResponse struct {
 	APIVersion string `json:"apiVersion"`
-	Error      RespErr `json:"error"`
+	Code       string `json:"code"`
+	Message    string `json:"message"`
+	StatusCode int    `json:"status_code"`
 }
 
 type RespErr struct {

internal/utils/util.go

@@ -16,15 +16,17 @@ func AssembleResponse(c *gin.Context, data interface{}, err error, opts ...Respo
 		code = http.StatusInternalServerError
 		c.JSON(code, FailResponse{
 			APIVersion: APIVersion,
-			Error: RespErr{
-				Code:    code,
+			Code:       "ERROR",
 			Message:    err.Error(),
-			},
+			StatusCode: code,
 		})
 		return
 	}
 	resp := SuccessResponse{
 		APIVersion: APIVersion,
+		Code:       "OK",
+		Message:    "success",
+		StatusCode: code,
 		Data:       data,
 	}