♻ Refactor Python folder tree (#629)

Co-authored-by: Sebastián Ramírez <tiangolo@gmail.com>

src/backend/app/api/deps.py

@@ -9,7 +9,7 @@ from sqlmodel import Session
 
 from app.core import security
 from app.core.config import settings
-from app.db.engine import engine
+from app.core.db import engine
 from app.models import TokenPayload, User
 
 reusable_oauth2 = OAuth2PasswordBearer(