fixed linting issues

backend/main.py

@@ -1,7 +1,7 @@
 # main.py
 from contextlib import _AsyncGeneratorContextManager, asynccontextmanager
 from typing import Any, Callable
-from fastapi import FastAPI, Depends
+from fastapi import FastAPI
 from fastapi.middleware.cors import CORSMiddleware
 from core.database import get_engine, Base
 from modules import router
@@ -9,9 +9,6 @@ import logging
 
 
 # import all models to ensure they are registered before create_all
-from modules.calendar.models import CalendarEvent
-from modules.auth.models import User
-from modules.todo.models import Todo # Import the new Todo model
 
 
 logging.getLogger('passlib').setLevel(logging.ERROR) # fix bc package logging is broken