Add visible v2 update badge

wrapper.js

@@ -0,0 +1,14 @@
+import http from 'node:http';
+
+const originalEnd = http.ServerResponse.prototype.end;
+
+http.ServerResponse.prototype.end = function (chunk, encoding, callback) {
+  const type = String(this.getHeader('content-type') || '');
+  if (typeof chunk === 'string' && type.startsWith('text/html') && chunk.includes('</body>')) {
+    const badge = '<div style="position:fixed;right:16px;bottom:16px;background:#1f6feb;color:#fff;padding:8px 12px;border-radius:999px;font:600 12px system-ui;box-shadow:0 8px 24px #0006">v2 · live update</div>';
+    chunk = chunk.replace('</body>', `${badge}</body>`);
+  }
+  return originalEnd.call(this, chunk, encoding, callback);
+};
+
+await import('./server.js');