fix: expose checkedIn in PartnerBookingListView — prefetch ticket_set

Add prefetch_related('ticket_set') to PartnerBookingListView queryset.
Serialize 'checkedIn': any(t.is_checked_in for t in b.ticket_set.all())
so partner portal attendees page can show real check-in status.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

admin_api/views.py

@@ -3922,7 +3922,7 @@ class PartnerBookingListView(APIView):
             ticket_meta__event__partner=partner
         ).select_related(
             'user', 'ticket_meta__event', 'ticket_type'
-        ).order_by('-created_date', '-id')
+        ).prefetch_related('ticket_set').order_by('-created_date', '-id')
 
         # Search: booking_id, user email, user first/last name
         search = request.query_params.get('search', '').strip()
@@ -3977,6 +3977,7 @@ class PartnerBookingListView(APIView):
                 'paymentStatus': b.payment_status,
                 'transactionId': b.transaction_id or '',
                 'createdDate': b.created_date.isoformat() if b.created_date else None,
+                'checkedIn': any(t.is_checked_in for t in b.ticket_set.all()),
             })
 
         return Response({