Initial marketplace implementation

Full-stack marketplace for buying/selling second-hand items.
React 19 + TypeScript + Tailwind CSS v4 frontend with 17 screens,
Express + Prisma + Socket.io backend, Stripe payments, JWT auth.

Deployed at https://marketplace.173.212.212.157.sslip.io/

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

client/src/router.tsx

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+import { createBrowserRouter } from 'react-router-dom';
+import { App } from './App';
+import { DashboardLayout } from './components/layout/DashboardLayout';
+import { RequireAuth } from './components/layout/RequireAuth';
+import { HomePage } from './pages/HomePage';
+import { LoginPage } from './pages/LoginPage';
+import { SignUpPage } from './pages/SignUpPage';
+import { SellItemPage } from './pages/SellItemPage';
+import { ProductDetailPage } from './pages/ProductDetailPage';
+import { CreateProfilePage } from './pages/CreateProfilePage';
+import { UpdateProfilePage } from './pages/UpdateProfilePage';
+import { ChatPage } from './pages/ChatPage';
+import { MyOffersPage } from './pages/MyOffersPage';
+import { NotificationsPage } from './pages/NotificationsPage';
+import { SoldItemsPage } from './pages/SoldItemsPage';
+import { SettingsPage } from './pages/SettingsPage';
+
+export const router = createBrowserRouter([
+  {
+    path: '/',
+    element: <App />,
+    children: [
+      { index: true, element: <HomePage /> },
+      { path: 'login', element: <LoginPage /> },
+      { path: 'signup', element: <SignUpPage /> },
+      { path: 'sell', element: <RequireAuth><SellItemPage /></RequireAuth> },
+      { path: 'listings/:id', element: <ProductDetailPage /> },
+      { path: 'profile/create', element: <RequireAuth><CreateProfilePage /></RequireAuth> },
+      { path: 'profile/edit', element: <RequireAuth><UpdateProfilePage /></RequireAuth> },
+      {
+        path: 'dashboard',
+        element: <RequireAuth><DashboardLayout /></RequireAuth>,
+        children: [
+          { path: 'messages', element: <ChatPage /> },
+          { path: 'offers', element: <MyOffersPage /> },
+          { path: 'notifications', element: <NotificationsPage /> },
+          { path: 'sold', element: <SoldItemsPage /> },
+          { path: 'settings', element: <SettingsPage /> },
+        ],
+      },
+    ],
+  },
+]);