TASK-001: Setup FastAPI project structure

- Fixed main.py to include all route routers (posts, users, comments, feed)
- Renamed app/models.py to app/schemas.py and split into proper schema modules
- Fixed schema imports in routes
- Updated app/models/__init__.py to properly export SQLAlchemy models
- Fixed database imports in route files
- App imports and runs correctly

app/routes/auth.py

@@ -6,8 +6,8 @@ from fastapi import APIRouter, Depends, HTTPException, status
 from fastapi.security import HTTPAuthorizationCredentials, HTTPBearer
 
 from app.auth import create_access_token, hash_password, verify_password
-from app.database import get_db, row_to_dict
-from app.models import Token, UserLogin, UserRegister
+from app.db.database import get_db, row_to_dict
+from app.schemas import Token, UserLogin, UserRegister
 
 router = APIRouter(prefix="/auth", tags=["Authentication"])
 security = HTTPBearer()