Integrate LiveKit SFU and harden booking workflow

app/(payload)/api/meetings/[slug]/kick/route.ts

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+import { NextResponse } from "next/server";
+import { getLiveKitRoomName, getLiveKitRoomService } from "@/lib/meeting/livekit";
+import { markMeetingParticipantKicked } from "@/lib/meeting/kicks";
+import { verifyMeetingToken } from "@/lib/meeting/token";
+
+export const dynamic = "force-dynamic";
+
+type Args = { params: Promise<{ slug: string }> };
+
+export async function POST(request: Request, { params }: Args) {
+  const { slug } = await params;
+  const authorization = request.headers.get("authorization") ?? "";
+  const appToken = authorization.startsWith("Bearer ") ? authorization.slice(7) : "";
+  const host = verifyMeetingToken(appToken);
+  if (!host || host.eventSlug !== slug || host.role !== "host") {
+    return NextResponse.json({ error: "Nur der Host darf Teilnehmer entfernen." }, { status: 403 });
+  }
+
+  let body: { participantId?: unknown };
+  try {
+    body = await request.json();
+  } catch {
+    return NextResponse.json({ error: "Ungültige Anfrage." }, { status: 400 });
+  }
+  const participantId = typeof body.participantId === "string" ? body.participantId.trim() : "";
+  if (!participantId || participantId.length > 100 || participantId === host.participantId) {
+    return NextResponse.json({ error: "Ungültiger Teilnehmer." }, { status: 400 });
+  }
+
+  try {
+    const roomService = getLiveKitRoomService();
+    const room = getLiveKitRoomName(slug);
+    const participant = (await roomService.listParticipants(room)).find((item) => item.identity === participantId);
+    if (!participant) return NextResponse.json({ error: "Teilnehmer nicht gefunden." }, { status: 404 });
+
+    let clientId: string | undefined;
+    try {
+      const metadata = JSON.parse(participant.metadata || "{}") as { clientId?: unknown };
+      if (typeof metadata.clientId === "string" && metadata.clientId.length <= 100) clientId = metadata.clientId;
+    } catch {
+      // Metadata is optional; the participant identity is still revoked below.
+    }
+    markMeetingParticipantKicked(slug, participantId, clientId);
+    await roomService.removeParticipant(room, participantId);
+    return NextResponse.json({ ok: true });
+  } catch (error) {
+    console.error("meeting participant kick failed", error);
+    return NextResponse.json({ error: "Der Teilnehmer konnte nicht entfernt werden." }, { status: 503 });
+  }
+}