初始提交：姜十三论坛 Jiang13 Forum

轻量自用论坛，Go 单二进制 + React SPA 内嵌 + SQLite。

Co-authored-by: Cursor <cursoragent@cursor.com>

frontend/src/App.tsx

@@ -0,0 +1,45 @@
+import { lazy, Suspense } from 'react';
+import { BrowserRouter, Routes, Route } from 'react-router-dom';
+import './styles/global.css';
+import { AuthProvider } from './hooks/useAuth';
+import { ThemeProvider } from './hooks/useTheme';
+import MainLayout from './layouts/MainLayout';
+import ErrorBoundary from './components/ErrorBoundary';
+import PageLoader from './components/PageLoader';
+import { Toaster } from './components/ui/sonner';
+
+const HomePage = lazy(() => import('./pages/HomePage'));
+const PostDetailPage = lazy(() => import('./pages/PostDetailPage'));
+const LoginPage = lazy(() => import('./pages/LoginPage'));
+const RegisterPage = lazy(() => import('./pages/RegisterPage'));
+const ComposePage = lazy(() => import('./pages/ComposePage'));
+const BoardsManagePage = lazy(() => import('./pages/BoardsManagePage'));
+const ProfilePage = lazy(() => import('./pages/ProfilePage'));
+const FavoritesPage = lazy(() => import('./pages/FavoritesPage'));
+
+export default function App() {
+  return (
+    <ThemeProvider>
+      <AuthProvider>
+        <ErrorBoundary>
+          <BrowserRouter>
+            <Routes>
+              <Route path="/login" element={<Suspense fallback={<PageLoader />}><LoginPage /></Suspense>} />
+              <Route path="/register" element={<Suspense fallback={<PageLoader />}><RegisterPage /></Suspense>} />
+              <Route element={<MainLayout />}>
+                <Route path="/" element={<HomePage />} />
+                <Route path="/post/:id" element={<PostDetailPage />} />
+                <Route path="/post/:id/edit" element={<ComposePage />} />
+                <Route path="/compose" element={<ComposePage />} />
+                <Route path="/boards" element={<BoardsManagePage />} />
+                <Route path="/profile" element={<ProfilePage />} />
+                <Route path="/favorites" element={<FavoritesPage />} />
+              </Route>
+            </Routes>
+          </BrowserRouter>
+          <Toaster />
+        </ErrorBoundary>
+      </AuthProvider>
+    </ThemeProvider>
+  );
+}