Add a hardened systemd unit, a Caddy reverse-proxy snippet that maps
/fabula/api/* to the loopback service, and Justfile build-server/
deploy-server recipes that build a static binary and ship + restart it.
Includes server/README documenting the API, config, and deploy steps.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
