Integrate LiveKit SFU and harden booking workflow

lib/booking/meetingAccess.ts

@@ -0,0 +1,23 @@
+import type { BookingRequest, Event, MeetingSetting } from "@/payload-types";
+import { canJoinMeeting, combineDateAndTime, getMeetingStatus, type MeetingStatus } from "@/lib/meeting/status";
+
+export function getBookingMeetingStatus(booking: BookingRequest, settings: MeetingSetting): MeetingStatus | null {
+  const event = typeof booking.linkedEvent === "object" ? (booking.linkedEvent as Event) : null;
+  if (booking.status !== "confirmed" || booking.appointmentType !== "online" || !event?.isOnline) return null;
+
+  const start = combineDateAndTime(booking.date, booking.startTime);
+  const end = booking.endTime
+    ? combineDateAndTime(booking.date, booking.endTime)
+    : new Date(start.getTime() + 60 * 60_000);
+  return getMeetingStatus({
+    start,
+    end,
+    joinWindowMinutes: settings.participantJoinWindowMinutes,
+    closeAfterMinutes: settings.meetingCloseAfterMinutes,
+  });
+}
+
+export function canJoinBookingMeeting(booking: BookingRequest, settings: MeetingSetting): boolean {
+  const status = getBookingMeetingStatus(booking, settings);
+  return status !== null && canJoinMeeting(status);
+}