feat(i18n): initialize internationalization and update Vite config for locale handling

- Added `initI18n` function call in `main.tsx` to bootstrap internationalization before rendering the app.
- Updated Vite configuration to handle specific locale files for English and Chinese.

webapp/src/main.tsx

@@ -1,6 +1,7 @@
 import { render } from 'preact';
 import { QueryClient, QueryClientProvider } from '@tanstack/react-query';
 import App from './App';
+import { initI18n } from './lib/i18n';
 import './tailwind.css';
 import './styles.css';
 
@@ -14,9 +15,14 @@ const queryClient = new QueryClient({
   },
 });
 
-render(
-  <QueryClientProvider client={queryClient}>
-    <App />
-  </QueryClientProvider>,
-  document.getElementById('root')!
-);
+async function bootstrap(): Promise<void> {
+  await initI18n();
+  render(
+    <QueryClientProvider client={queryClient}>
+      <App />
+    </QueryClientProvider>,
+    document.getElementById('root')!
+  );
+}
+
+void bootstrap();