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>

waiter_pwa/vite.config.js

@@ -0,0 +1,38 @@
+import { defineConfig } from 'vite'
+import react from '@vitejs/plugin-react'
+import { VitePWA } from 'vite-plugin-pwa'
+
+export default defineConfig({
+  server: {
+    host: '0.0.0.0',
+    port: 5173,
+    allowedHosts: ['all'],
+  },
+  plugins: [
+    react(),
+    VitePWA({
+      registerType: 'autoUpdate',
+      manifest: {
+        name: 'TableServe',
+        short_name: 'TableServe',
+        start_url: '/',
+        display: 'standalone',
+        background_color: '#0f172a',
+        theme_color: '#0f172a',
+        icons: [
+          { src: '/icons/icon-192.png', sizes: '192x192', type: 'image/png', purpose: 'any' },
+          { src: '/icons/icon-192.png', sizes: '192x192', type: 'image/png', purpose: 'maskable' },
+          { src: '/icons/icon-512.png', sizes: '512x512', type: 'image/png', purpose: 'any' },
+          { src: '/icons/icon-512.png', sizes: '512x512', type: 'image/png', purpose: 'maskable' },
+        ],
+      },
+      workbox: {
+        globPatterns: ['**/*.{js,css,html,ico,png,svg}'],
+        runtimeCaching: [],
+      },
+      devOptions: {
+        enabled: true,
+      },
+    }),
+  ],
+})