refactor: reorganize the whole project layout

app/api/auth/router.py

@@ -1,15 +1,16 @@
 from datetime import UTC, datetime
 from typing import Annotated
 
+from fastapi import APIRouter, Depends, HTTPException, Response, status
+
 from core.security import (
     AuthContext,
     create_access_token,
     get_auth_context,
     verify_password,
 )
-from db.auth import get_user_by_username, revoke_token
-from fastapi import APIRouter, Depends, HTTPException, Response, status
 from models.auth import LoginInput, TokenResponse
+from repositories.auth import get_user_by_username, revoke_token
 
 router = APIRouter(
     prefix="/auth",