src/api/v1/endpoints/
├── users.py
├── items.py
└── auth.py

from fastapi import APIRouter

router = APIRouter()

@router.get("/")
async def get_users():
    ...

from fastapi import APIRouter
from src.api.v1.endpoints import users, items

api_router = APIRouter()
api_router.include_router(users.router, prefix="/users", tags=["users"])
api_router.include_router(items.router, prefix="/items", tags=["items"])

src/app/
├── api/
│   ├── users/
│   │   ├── route.py  # Handles /api/users
│   │   └── [id]/
│   │       └── route.py # Handles /api/users/{id}