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

backend/app/core/config.py

@@ -1,7 +1,8 @@
-from pydantic_settings import BaseSettings
-from typing import Optional, List
-from pydantic import Field, field_validator
 import logging
+from typing import Optional, List
+
+from pydantic import Field, field_validator
+from pydantic_settings import BaseSettings
 
 
 class Settings(BaseSettings):