web: add number of future occurrences to compact event listing for app

web/src/app/api/v1/events/route.ts

@@ -82,6 +82,7 @@ export async function GET(req: NextRequest, res: NextResponse<ResponseData>) {
     return {
       url: `${process.env.URL}/arrangementer/${event.slug}`,
       nextOccurrence: nextOccurrence,
+      futureOccurrencesCount: futureOccurrences.length,
       ...whitelistFilter(event, keepKeys),
     };
   });