feat: initial commit

src/app/demo/page.tsx

@@ -0,0 +1,11 @@
+import { AppShell } from "@/components/layout/AppShell";
+
+export default function DemoPage() {
+  const demoUser = {
+    id: "demo-user",
+    name: "Demo Explorer",
+    email: "demo@checkflow.local",
+  };
+
+  return <AppShell user={demoUser} isDemo={true} />;
+}