Feat/environment variables in workflow (#6515)

Co-authored-by: JzoNg <jzongcode@gmail.com>

api/services/recommended_app_service.py

@@ -4,7 +4,6 @@ from os import path
 from typing import Optional
 
 import requests
-from flask import current_app
 
 from configs import dify_config
 from constants.languages import languages