Remove and reorder unused imports across the project for cleaner and more consistent code structure

backend/app/services/auth_service.py

@@ -3,8 +3,8 @@ import logging
 from typing import Optional
 from uuid import UUID
 
-from sqlalchemy.ext.asyncio import AsyncSession
 from sqlalchemy import select
+from sqlalchemy.ext.asyncio import AsyncSession
 
 from app.core.auth import (
     verify_password_async,

backend/app/services/email_service.py

@@ -6,8 +6,8 @@ This service provides email sending functionality with a simple console/log-base
 placeholder that can be easily replaced with a real email provider (SendGrid, SES, etc.)
 """
 import logging
-from typing import List, Optional
 from abc import ABC, abstractmethod
+from typing import List, Optional
 
 from app.core.config import settings