feat: T4 wave 3 - notifications per user, suggestions API, varroa bands, split/queen events

- Schema III: per-user notifications (broadcast fan-out migration,
  category, link, requiredPermissions filter), notification preferences
  and settings endpoints, calendar withdrawal switch, occupiedFrames
- Suggestions API: list/summary with permission visibility and paging,
  accept/dismiss/reopen incl. bulk, SuggestionView on all responses
- Varroa traffic light by season and method, young colonies, treatment
  effect window, sample-based percentage; shared withdrawal-window helper
  on Berlin calendar days; GET /varroa-measurements/thresholds
- ColonySplit and QueenAssigned domain events with calendar and webhook
  handlers
- Outbox claims compare against now() rounded to timestamp(3); fixes the
  flaky e2e claims of rows written with SQL now()

Co-Authored-By: Claude Opus 5.5 (1M context) <[email protected]>

ApiCore-Backend/src/calendar-sync/calendar-sync.handlers.ts

@@ -74,4 +74,17 @@ export class CalendarSyncEventHandlers {
     }
     await this.calendarSync.enqueueIn(tx, 'TASK', event.aggregateId);
   }
+
+  // The aggregate is the queen; the calendar entry belongs to the history row.
+  @OnDomainEvent(['QueenAssigned'], 'calendar-sync.queen-assignment')
+  async queenAssignment(
+    event: AnyDomainEventEnvelope<'QueenAssigned'>,
+    tx: Prisma.TransactionClient,
+  ): Promise<void> {
+    await this.calendarSync.enqueueIn(
+      tx,
+      'QUEEN_ASSIGNMENT',
+      event.payload.historyId,
+    );
+  }
 }