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/post-commit-side-effects.e2e-spec.ts

@@ -213,7 +213,7 @@ describe('Post-commit side effects (e2e)', () => {
         .mockImplementation(() => undefined);
       // Automation: the warning cannot be written.
       jest
-        .spyOn(app.get(NotificationsService), 'record')
+        .spyOn(app.get(NotificationsService), 'recordForPermission')
         .mockRejectedValue(new Error('notifications down'));
       // Calendar sync: enqueue cannot read its settings.
       jest
@@ -290,7 +290,7 @@ describe('Post-commit side effects (e2e)', () => {
       jest.spyOn(Logger.prototype, 'warn').mockImplementation(() => undefined);
       const colonyId = (await createColony('PC-RETRY')).id;
       jest
-        .spyOn(app.get(NotificationsService), 'record')
+        .spyOn(app.get(NotificationsService), 'recordForPermission')
         .mockRejectedValueOnce(new Error('notifications down'));
 
       const { body } = (await post('/api/v1/inspections', {
@@ -311,9 +311,13 @@ describe('Post-commit side effects (e2e)', () => {
       await prisma.$executeRaw`UPDATE "DomainEvent" SET "availableAt" = now() WHERE "aggregateId" = ${body.id}`;
       await drainDomainEvents(app, [body.id]);
       expect(await taskCount('QUEENLESS_NO_EGGS', colonyId)).toBe(1);
-      expect(
-        await prisma.notification.count({ where: { relatedId: colonyId } }),
-      ).toBe(1);
+      // One copy per recipient (everybody who may read tasks), written once.
+      const warnings = await prisma.notification.findMany({
+        where: { relatedId: colonyId },
+        select: { userId: true },
+      });
+      expect(warnings.length).toBeGreaterThan(0);
+      expect(new Set(warnings.map((w) => w.userId)).size).toBe(warnings.length);
 
       const deliveries = await prisma.domainEventDelivery.findMany({
         where: { event: { aggregateId: body.id } },