Initial commit: ANOUMA website with Payload CMS, WebRTC meetings, and booking system

- Next.js 16 App Router site with the ANOUMA design system
- Payload CMS (PostgreSQL) for offers, events, posts and page content
- WebRTC video-call system with custom signaling server
- SMTP email reminders and booking-request notifications
- Customer accounts, calendar-based availability, and booking workflow

components/auth/LogoutButton.tsx

@@ -0,0 +1,19 @@
+"use client";
+
+import { useRouter } from "next/navigation";
+
+export function LogoutButton({ className }: { className?: string }) {
+  const router = useRouter();
+
+  async function handleLogout() {
+    await fetch("/api/customers/logout", { method: "POST", credentials: "include" });
+    router.push("/");
+    router.refresh();
+  }
+
+  return (
+    <button type="button" onClick={handleLogout} className={className}>
+      Abmelden
+    </button>
+  );
+}