- Implement file saving to disk in `NotificationServer` with optional UUID-based organization.
- Use `Config` to configure `DOWNLOAD_DIR` and `PORT` for better flexibility.
- Update HTTP responses for improved clarity on file download and save operations.
- Introduce `/notify/{uuid}/{file}.json` endpoint in `NotificationServer`.
- Validate UUID format and handle bad requests with appropriate error responses.
- Extend `FileDownloadService` to support downloads using UUIDs.
- Refactor common file download logic for reuse across endpoints.
- Introduce `NotificationServer` for handling HTTP notifications.
- Register `ProxyShutdownEvent` to stop the notification server on shutdown.
- Add `FileDownloadService` for asynchronous file downloads using the configured endpoint.
- Update `Config` to include `download-endpoint`.
- Add Javalin and SLF4J dependencies for the HTTP server.
akastijn