feat: initial commit — local services (backend + manager dashboard + waiter PWA)

Includes all work to date:
- local_backend: FastAPI backend with products, orders, tables, shifts, cloud sync
- manager_dashboard: React manager UI with product/category management, reports, settings
- waiter_pwa: React PWA for waiter devices
- Category reparent endpoint and UI
- Waiter domain: local_ip sent on heartbeat, waiter_domain persisted from cloud response
- QR code modal in AppInfoTab for waiter domain
- Product form: number input spinners removed, category pre-selected on new product
- Category row: count badge moved to far right

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

docker-compose.yml

@@ -0,0 +1,41 @@
+services:
+  backend:
+    image: ${REGISTRY}/pos-backend:${VERSION:-latest}
+    restart: unless-stopped
+    environment:
+      - SITE_ID=${SITE_ID}
+      - SITE_KEY=${SITE_KEY}
+      - CLOUD_URL=${CLOUD_URL}
+      - SECRET_KEY=${SECRET_KEY}
+      - LICENSE_GRACE_HOURS=${LICENSE_GRACE_HOURS:-24}
+      - DATABASE_URL=sqlite:////app/data/pos.db
+      - VERSION=${VERSION:-0.0.0}
+    volumes:
+      - ${DATA_PATH}:/app/data
+      - ${LOGO_PATH}:/app/logo.png:ro
+
+  waiter_pwa:
+    image: ${REGISTRY}/pos-waiter:${VERSION:-latest}
+    restart: unless-stopped
+    depends_on:
+      - backend
+
+  manager_dashboard:
+    image: ${REGISTRY}/pos-manager:${VERSION:-latest}
+    restart: unless-stopped
+    depends_on:
+      - backend
+
+  proxy:
+    image: nginx:alpine
+    ports:
+      - "80:80"
+      - "443:443"
+      - "4443:4443"
+    volumes:
+      - ./nginx-proxy/nginx.conf:/etc/nginx/conf.d/default.conf:ro
+      - ./certs:/etc/nginx/certs:ro
+    depends_on:
+      - waiter_pwa
+      - manager_dashboard
+    restart: unless-stopped