Add Next.js frontends with health endpoints

apps/prism-console/app/page.tsx

@@ -0,0 +1,13 @@
+export default function Page() {
+  return (
+    <div>
+      <h2>Prism Console</h2>
+      <p>Welcome to the BlackRoad OS operator console.</p>
+      <ul>
+        <li>Monitor services</li>
+        <li>Inspect agents</li>
+        <li>Trigger workflows</li>
+      </ul>
+    </div>
+  );
+}