refactor: Fix linter errors by auto-apply

- Apply automated linter fixes
- Manually reformat fields in model/service.go
- Resolve code complexity issues

router/midlleware/user.go

@@ -23,6 +23,7 @@ func SetUserFromJWT() gin.HandlerFunc {
 		subject, err := token.Claims.GetSubject()
 		if err != nil {
 			c.Writer.WriteHeader(http.StatusUnauthorized)
+
 			return
 		}