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/test/calendar-sync.e2e-spec.ts

@@ -44,6 +44,7 @@ describe('Calendar sync outbox (e2e)', () => {
     syncFeeding: true,
     syncHarvest: true,
     syncQueenAssignment: true,
+    syncWithdrawal: true,
     updatedAt: new Date(),
   };
 
@@ -359,6 +360,37 @@ describe('Calendar sync outbox (e2e)', () => {
       expect(JSON.stringify(response.body)).toContain('Gruppen-ID');
     });
 
+    // GET /settings is mocked in this file (see beforeEach), so the stored
+    // row is read directly.
+    it('syncWithdrawal is on by default and can be switched off', async () => {
+      const fresh = await prisma.calendarSyncSettings.create({
+        data: { id: `default-check-${suffix}` },
+      });
+      await prisma.calendarSyncSettings.delete({ where: { id: fresh.id } });
+      expect(fresh.syncWithdrawal).toBe(true);
+      await prisma.calendarSyncSettings.upsert({
+        where: { id: 'singleton' },
+        create: { id: 'singleton' },
+        update: {},
+      });
+
+      const response = await request(app.getHttpServer())
+        .patch('/api/v1/calendar/sync/settings')
+        .set(auth())
+        .send({ syncWithdrawal: false })
+        .expect(200);
+
+      expect(response.body).toMatchObject({ syncWithdrawal: false });
+      const stored = await prisma.calendarSyncSettings.findUniqueOrThrow({
+        where: { id: 'singleton' },
+      });
+      expect(stored.syncWithdrawal).toBe(false);
+      await prisma.calendarSyncSettings.update({
+        where: { id: 'singleton' },
+        data: { syncWithdrawal: true },
+      });
+    });
+
     // PATCH null rule: the switches cannot hold null - 400, not a 500.
     it('rejects null on a switch with 400', async () => {
       await request(app.getHttpServer())