add_items now runs printer routing synchronously and returns
{ order, print_results } so the waiter PWA can show per-printer
ack or failure without guessing. Extracted _do_route_and_print
so the background-task path (route_and_print) is unchanged for
other callers.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
- New cloud_backend/ FastAPI service on port 8001 (SQLite for dev, swappable to PostgreSQL)
- Endpoints: sysadmin auth (JWT), site registration, lock/unlock, heartbeat (X-Site-ID + X-Site-Key headers)
- Default sysadmin seeded on first startup from ADMIN_USERNAME/ADMIN_PASSWORD env vars
- cloud_backend added to docker-compose.yml with persistent data volume at ./data/cloud/
- local_backend cloud_sync.py updated to use correct /api/heartbeat/ endpoint with header auth
- local_backend config.py: added SITE_KEY setting
- Smoke tested: login, register site, heartbeat, lock, unlock, list all pass
