- nginx client_max_body_size raised to 800m (was 20m) to allow 577MB backup
upload; proxy_read_timeout raised to 600s for long restore operations
- Add api/kds_settings.py: GET+PATCH /api/kds/settings served by kitchen
backend (kitchen Settings page configures KDS timers/GraphQL/course order;
all config lives in kitchen_settings so kitchen owns these endpoints)
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
