feat: platform backbone and field capture complete (checkpoint)

Platform backbone (plan 2026-10-13-plattform-rueckgrat), all tasks reviewed:
- webhooks with delivery table, retries and stable delivery id
- calendar handlers; a finished task removes its Outlook event
- tasks, automations, inspections, varroa, treatments, feedings,
  harvests, colonies, wintering, stock and bottling record domain events
  in the same transaction; legacy post-commit calls removed
- row locks through one helper (lockRowForUpdate, lockRowsForShare,
  lockRowsForUpdate)
- job framework with JobRun, cli exit codes, cleanup, task templates,
  daily evaluation, hourly app-backup and the rekey job
- system API and page "Verwaltung > System" with retry
- @nestjs/schedule removed, guard tests against in-process schedulers

Field capture T3 (plan 2026-10-13-t3-erfassung-am-stand), all tasks reviewed:
- inspection photo offline without metadata
- bulk capture for treatments, feedings and varroa (backend + frontend)
- offline stand mode with service worker, offline pages and packs
- offline session, cold start and logout on shared devices

Docs: ARCHITECTURE.md assumptions and sections updated, TASKS.md.
Gates: backend lint, typecheck, 1770 unit, 420 e2e, build, no schema
drift; frontend lint, typecheck, 913 tests, build. Not rolled out.

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

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

@@ -0,0 +1,77 @@
+import { Injectable } from '@nestjs/common';
+import type { AnyDomainEventEnvelope } from '../domain-events/domain-event-types';
+import { OnDomainEvent } from '../domain-events/on-domain-event.decorator';
+import { Prisma } from '../../generated/prisma';
+import { CalendarSyncService } from './calendar-sync.service';
+
+/**
+ * Puts calendar-relevant records into the M365 outbox. Pure DB writer: the
+ * Graph call itself happens in CalendarSyncService.processOutbox (worker
+ * loop). Errors propagate, so a failed delivery is retried.
+ */
+@Injectable()
+export class CalendarSyncEventHandlers {
+  constructor(private readonly calendarSync: CalendarSyncService) {}
+
+  @OnDomainEvent(
+    ['InspectionRecorded', 'InspectionCorrected'],
+    'calendar-sync.inspection',
+  )
+  async inspection(
+    event: AnyDomainEventEnvelope<'InspectionRecorded' | 'InspectionCorrected'>,
+    tx: Prisma.TransactionClient,
+  ): Promise<void> {
+    await this.calendarSync.enqueueIn(tx, 'INSPECTION', event.aggregateId);
+  }
+
+  @OnDomainEvent(
+    ['TreatmentRecorded', 'TreatmentCorrected'],
+    'calendar-sync.treatment',
+  )
+  async treatment(
+    event: AnyDomainEventEnvelope<'TreatmentRecorded' | 'TreatmentCorrected'>,
+    tx: Prisma.TransactionClient,
+  ): Promise<void> {
+    await this.calendarSync.enqueueIn(tx, 'TREATMENT', event.aggregateId);
+  }
+
+  @OnDomainEvent(
+    ['FeedingRecorded', 'FeedingCorrected'],
+    'calendar-sync.feeding',
+  )
+  async feeding(
+    event: AnyDomainEventEnvelope<'FeedingRecorded' | 'FeedingCorrected'>,
+    tx: Prisma.TransactionClient,
+  ): Promise<void> {
+    await this.calendarSync.enqueueIn(tx, 'FEEDING', event.aggregateId);
+  }
+
+  @OnDomainEvent(
+    ['HarvestRecorded', 'HarvestCorrected'],
+    'calendar-sync.harvest',
+  )
+  async harvest(
+    event: AnyDomainEventEnvelope<'HarvestRecorded' | 'HarvestCorrected'>,
+    tx: Prisma.TransactionClient,
+  ): Promise<void> {
+    await this.calendarSync.enqueueIn(tx, 'HARVEST', event.aggregateId);
+  }
+
+  // Updated and completed tasks are enqueued even without a due date or
+  // when done: the worker then removes an event created earlier.
+  @OnDomainEvent(
+    ['TaskCreated', 'TaskUpdated', 'TaskCompleted'],
+    'calendar-sync.task',
+  )
+  async task(
+    event: AnyDomainEventEnvelope<
+      'TaskCreated' | 'TaskUpdated' | 'TaskCompleted'
+    >,
+    tx: Prisma.TransactionClient,
+  ): Promise<void> {
+    if (event.type === 'TaskCreated' && event.payload.dueDate === null) {
+      return;
+    }
+    await this.calendarSync.enqueueIn(tx, 'TASK', event.aggregateId);
+  }
+}