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.dev.yml

@@ -0,0 +1,20 @@
+services:
+  backend:
+    build: ./local_backend
+    image: ${REGISTRY}/pos-backend:${VERSION:-latest}
+    ports:
+      - "8000:8000"
+
+  waiter_pwa:
+    build:
+      context: ./waiter_pwa
+    image: ${REGISTRY}/pos-waiter:${VERSION:-latest}
+    ports:
+      - "5173:80"
+
+  manager_dashboard:
+    build:
+      context: ./manager_dashboard
+    image: ${REGISTRY}/pos-manager:${VERSION:-latest}
+    ports:
+      - "5174:80"