chore: remove redundant casting flask app config into dict (#2564)

api/commands.py

 import base64
 import json
 import secrets
-from typing import cast
 
 import click
 from flask import current_app
     """
     click.echo(click.style('Start migrate vector db.', fg='green'))
     create_count = 0
-    config = cast(dict, current_app.config)
+    config = current_app.config
     vector_type = config.get('VECTOR_STORE')
     page = 1
     while True:

api/core/rag/datasource/keyword/keyword_factory.py

-from typing import Any, cast
+from typing import Any
 
 from flask import current_app
 
         self._keyword_processor = self._init_keyword()
 
     def _init_keyword(self) -> BaseKeyword:
-        config = cast(dict, current_app.config)
+        config = current_app.config
         keyword_type = config.get('KEYWORD_STORE')
 
         if not keyword_type:

api/core/rag/datasource/vdb/vector_factory.py

 import json
-from typing import Any, cast
+from typing import Any
 
 from flask import current_app
 
         self._vector_processor = self._init_vector()
 
     def _init_vector(self) -> BaseVector:
-        config = cast(dict, current_app.config)
+        config = current_app.config
         vector_type = config.get('VECTOR_STORE')
 
         if self._dataset.index_struct_dict: