feat(content): implement Content Engine MVP (v1.0) with GTM integration

content-engine/frontend/src/main.tsx

@@ -0,0 +1,11 @@
+
+import React from 'react'
+import ReactDOM from 'react-dom/client'
+import App from './App.tsx'
+import './index.css'
+
+ReactDOM.createRoot(document.getElementById('root')!).render(
+  <React.StrictMode>
+    <App />
+  </React.StrictMode>,
+)