Add Next.js frontends with health endpoints

apps/web/app/page.tsx

@@ -0,0 +1,12 @@
+export default function Page() {
+  return (
+    <div>
+      <h1>BlackRoad Operating System</h1>
+      <p>
+        A multi-service, agent-native OS for orchestrating AI, compute,
+        and compliance.
+      </p>
+      <p>Deployed on Railway. Fronted by Cloudflare. Driven by you.</p>
+    </div>
+  );
+}