* set up FastAPI within the existing project structure * ensure it runs alongside Flask without breaking existing functionality * make sure OpenAPI documentation is generated * add a basic health check endpoint in FastAPI to verify functionality (see [healthz.py](https://github.com/packit/packit-service/blob/main/packit_service/service/api/healthz.py)) * migrate [system.py](https://github.com/packit/packit-service/blob/main/packit_service/service/api/system.py) (while still preserving the Flask endpoint)