chore: sync uncommitted working tree changes before clone cleanup

app/services/auth_service.py

@@ -2,8 +2,6 @@
 
 from __future__ import annotations
 
-from typing import Optional
-
 from sqlalchemy import select
 from sqlalchemy.exc import IntegrityError
 from sqlalchemy.ext.asyncio import AsyncSession
@@ -94,7 +92,7 @@ async def register_user(
 
 async def authenticate_user(
     db: AsyncSession, email: str, password: str
-) -> Optional[tuple[User, str]]:
+) -> tuple[User, str] | None:
     """Verify credentials and return (user, token) on success, None on failure.
 
     The endpoint wraps this and returns 401 on None — keeping the