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

app/(payload)/api/booking/[id]/accept-alternative/route.ts

@@ -0,0 +1,51 @@
+import { NextResponse } from "next/server";
+import { getPayload } from "payload";
+import config from "@payload-config";
+
+export const dynamic = "force-dynamic";
+
+type Args = { params: Promise<{ id: string }> };
+
+export async function POST(request: Request, { params }: Args) {
+  const { id } = await params;
+
+  try {
+    const payload = await getPayload({ config });
+    const { user } = await payload.auth({ headers: request.headers });
+    if (!user || user.collection !== "customers") {
+      return NextResponse.json({ error: "Bitte melde dich an." }, { status: 401 });
+    }
+
+    const booking = await payload.findByID({ collection: "booking-requests", id, depth: 0 }).catch(() => null);
+    if (!booking || Number(booking.user) !== Number(user.id)) {
+      return NextResponse.json({ error: "Buchung nicht gefunden." }, { status: 404 });
+    }
+    const alternative = booking.proposedAlternative;
+    if (booking.status !== "pending" || !alternative?.date || !alternative.startTime || !alternative.endTime) {
+      return NextResponse.json({ error: "Für diese Buchung liegt kein alternativer Termin vor." }, { status: 409 });
+    }
+
+    // The beforeChange hook on booking-requests re-checks for conflicts
+    // (with an advisory lock) before allowing this to become "confirmed" —
+    // the alternative slot may have been taken by someone else since it was
+    // proposed.
+    await payload.update({
+      collection: "booking-requests",
+      id,
+      data: {
+        status: "confirmed",
+        date: alternative.date,
+        startTime: alternative.startTime,
+        endTime: alternative.endTime,
+      },
+    });
+
+    return NextResponse.json({ ok: true });
+  } catch (error) {
+    if (error instanceof Error && "status" in error && (error as { status: number }).status === 409) {
+      return NextResponse.json({ error: error.message }, { status: 409 });
+    }
+    console.error("accept-alternative failed", error);
+    return NextResponse.json({ error: "Der Termin konnte nicht angenommen werden." }, { status: 500 });
+  }
+}