🐛 fix(chat.py): add type hint to flow_data_store variable

🔥 chore(main.py): remove unused imports and variables
The `flow_data_store` variable in `chat.py` was missing a type hint, which was added to improve code readability and maintainability. In `main.py`, unused imports and variables were removed to improve code cleanliness.

src/backend/langflow/api/v1/chat.py

@@ -16,7 +16,7 @@ from cachetools import LRUCache
 
 router = APIRouter(tags=["Chat"])
 chat_manager = ChatManager()
-flow_data_store = LRUCache(maxsize=10)
+flow_data_store: LRUCache = LRUCache(maxsize=10)
 
 
 @router.websocket("/chat/{client_id}")

src/backend/langflow/main.py

@@ -1,13 +1,9 @@
-import os
-from typing import Optional
 
 from fastapi import FastAPI
-from fastapi.responses import FileResponse
 from fastapi.middleware.cors import CORSMiddleware
 
 from langflow.api import router
 from langflow.database.base import create_db_and_tables
-from pathlib import Path
 
 
 def create_app():