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>

manager_dashboard/tailwind.config.js

@@ -0,0 +1,23 @@
+/** @type {import('tailwindcss').Config} */
+export default {
+  content: ['./index.html', './src/**/*.{js,jsx}'],
+  theme: {
+    extend: {
+      colors: {
+        primary: {
+          DEFAULT: '#0f766e',
+          50:  '#f0fdfa',
+          100: '#ccfbf1',
+          600: '#0d9488',
+          700: '#0f766e',
+          800: '#115e59',
+          900: '#134e4a',
+        },
+      },
+      fontSize: {
+        base: ['1rem', { lineHeight: '1.5rem' }],
+      },
+    },
+  },
+  plugins: [],
+}