feat: install react-helmet-async and gray-matter, add HelmetProvider

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

src/main.tsx

@@ -4,6 +4,7 @@ import './index.css';
 import { AuthProvider } from './contexts/AuthContext';
 import { LanguageProvider } from './contexts/LanguageContext';
 import { BrowserRouter } from 'react-router-dom';
+import { HelmetProvider } from 'react-helmet-async';
 import AppRouter from './routes/AppRouter';
 
 // 错误处理：捕获未处理的错误
@@ -23,13 +24,15 @@ if (!rootElement) {
 try {
   createRoot(rootElement).render(
     <StrictMode>
-      <BrowserRouter>
-        <AuthProvider>
-          <LanguageProvider>
-            <AppRouter />
-          </LanguageProvider>
-        </AuthProvider>
-      </BrowserRouter>
+      <HelmetProvider>
+        <BrowserRouter>
+          <AuthProvider>
+            <LanguageProvider>
+              <AppRouter />
+            </LanguageProvider>
+          </AuthProvider>
+        </BrowserRouter>
+      </HelmetProvider>
     </StrictMode>
   );
 } catch (error) {