Rename login function to login_app for clarity and consistency

main.py

@@ -210,7 +210,7 @@ def index() -> FileResponse:
     return FileResponse(path=str(file_path), media_type="text/html")
 
 @app.post("/login", response_model=TokenResponse)
-def login(form_data: OAuth2PasswordRequestForm = Depends()):
+def login_app(form_data: OAuth2PasswordRequestForm = Depends()):
     username = authenticate_user(form_data.username, form_data.password)
     if not username:
         raise HTTPException(