refactor: restructure project into layered architecture

backend/main.py

@@ -1,18 +1,13 @@
-from fastapi import FastAPI, Depends, HTTPException
-from sqlalchemy.orm import Session
+from fastapi import FastAPI
 from fastapi.middleware.cors import CORSMiddleware
 
-import models
-import schemas
-import crud
+from api.admin import router as admin_router
+from api.user import router as user_router
 
-from database import SessionLocal, engine
-
-models.Base.metadata.create_all(bind=engine)
 
 app = FastAPI()
 
-# CORS
+
 app.add_middleware(
     CORSMiddleware,
     allow_origins=["*"],
@@ -22,6 +17,6 @@ app.add_middleware(
 )
 
 
+app.include_router(admin_router)
 
-app.include_router(user_router)
-app.include_router(admin_router)
+app.include_router(user_router)