refactor(api): Fix issues reported by pre-commit

- Modified code layout and formatting in multiple files, improving code readability.
  - Updated import statements, removing unused libraries.
  - Simplified the writing of some functions and exception handling.

lightrag/api/auth.py

@@ -29,14 +29,12 @@ class AuthHandler:
 
             if datetime.utcnow() > expire_time:
                 raise HTTPException(
-                    status_code=status.HTTP_401_UNAUTHORIZED,
-                    detail="Token expired"
+                    status_code=status.HTTP_401_UNAUTHORIZED, detail="Token expired"
                 )
             return payload["sub"]
         except jwt.PyJWTError:
             raise HTTPException(
-                status_code=status.HTTP_401_UNAUTHORIZED,
-                detail="Invalid token"
+                status_code=status.HTTP_401_UNAUTHORIZED, detail="Invalid token"
             )