improve: introduce isort for linting Python imports (#1983)

api/controllers/web/site.py

@@ -1,15 +1,14 @@
 # -*- coding:utf-8 -*-
 import os
 
-from flask_restful import fields, marshal_with
-from flask import current_app
-from werkzeug.exceptions import Forbidden
-
 from controllers.web import api
 from controllers.web.wraps import WebApiResource
 from extensions.ext_database import db
+from flask import current_app
+from flask_restful import fields, marshal_with
 from models.model import Site
 from services.feature_service import FeatureService
+from werkzeug.exceptions import Forbidden
 
 
 class AppSiteApi(WebApiResource):