Overhaul of the frontend on waiters, orders, and payment events

Manager Dashboard: product reorder/bulk actions, preference sub-choices
UI, expanded reports with DateInput component, waiter management updates,
order detail improvements, Docker config and backend dockerignore added.

Backend: table groups, auto-numbering, has_active_order flag, expanded
reporting endpoints, waiter zone management, user schema updates, system
router additions, table router fixes.

Waiter PWA: TableDetailPage order/payment event improvements.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

docker-compose.yml

@@ -21,6 +21,7 @@ services:
       - ./local_backend/license_state.json:/app/license_state.json
       - ./logo.png:/app/logo.png:ro
       - ./data/product_images:/app/data/product_images
+      - ./data/avatars:/app/data/avatars
     extra_hosts:
       - "host.docker.internal:host-gateway"