app/main.py assembles the lifespan-managed background tasks (Electrum
listener, round scheduler, confirmation poller, RBF bumper) and mounts
all routers behind a /health check. generate_master_key.py is the
one-time ops script that creates and Fernet-encrypts the server's
master xprv before first launch.
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
