refactor: reorganize import statements for consistency across multiple files

tests/services/test_auth_service.py

@@ -6,12 +6,11 @@ from typing import cast
 from unittest.mock import MagicMock
 
 import pytest  # type: ignore[import-not-found]
-from sqlalchemy.ext.asyncio import AsyncSession
-
 from app.core.security import JWTService, PasswordHasher
 from app.models.user import User
 from app.repositories.user_repo import UserRepository
 from app.services.auth_service import AuthService, InvalidCredentialsError, InvalidRefreshTokenError
+from sqlalchemy.ext.asyncio import AsyncSession
 
 
 class StubUserRepository(UserRepository):