Buchungskalender: iCal-Import und -Export

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

server/services/unterkunft/schema.js

@@ -32,7 +32,7 @@ export const UNTERKUNFT_COLLECTIONS = {
       str('icalImporte', 4000),
       str('icalExportToken', 64),
     ],
-    indexes: [index('idx_feature', 'featureId')],
+    indexes: [index('idx_feature', 'featureId'), index('idx_export_token', 'icalExportToken')],
   },
   ukPreise: {
     attributes: [