chore: add ast-grep rule to convert Optional[T] to T | None (#25560)

Co-authored-by: autofix-ci[bot] <114827586+autofix-ci[bot]@users.noreply.github.com>

api/services/recommended_app_service.py

@@ -1,5 +1,3 @@
-from typing import Optional
-
 from configs import dify_config
 from services.recommend_app.recommend_app_factory import RecommendAppRetrievalFactory
 
@@ -25,7 +23,7 @@ class RecommendedAppService:
         return result
 
     @classmethod
-    def get_recommend_app_detail(cls, app_id: str) -> Optional[dict]:
+    def get_recommend_app_detail(cls, app_id: str) -> dict | None:
         """
         Get recommend app detail.
         :param app_id: app id