Phase 3: scaffold Manager Dashboard — all pages, layout, routing

Includes: LoginPage (PIN pad), DashboardPage (30s polling table grid),
OrderDetailPage (full actions), ProductsPage (CRUD + printer zone),
WaitersPage (block/reset PIN/delete), TablesPage, ReportsPage
(shift summary + order history + CSV export), SettingsPage (printers
+ test print + sysadmin lock/unlock). TailwindCSS, React Query,
react-hot-toast. Docker Compose service on port 5174.

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: [],
+}