Fix: Correct Vite manifest key lookup

- Changed from 'src/client/main.tsx' to 'index.html' to match actual manifest
- Fixes production asset loading
- Resolves empty page issue in production mode

src/server/routes/client-entry.tsx

@@ -14,7 +14,7 @@ export function clientEntry(c: Context<BlankEnv>) {
       // Read Vite manifest to get the correct file names
       const manifestPath = join(process.cwd(), 'dist', '.vite', 'manifest.json');
       const manifest = JSON.parse(readFileSync(manifestPath, 'utf-8'));
-      const entry = manifest['src/client/main.tsx'];
+      const entry = manifest['index.html'];
       if (entry) {
         jsFile = `/assets/${entry.file}`;
         if (entry.css) {