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/test/utils/webhooks.ts

@@ -0,0 +1,15 @@
+import { INestApplicationContext } from '@nestjs/common';
+import { WebhookDeliveryWorker } from '../../src/webhooks/webhook-delivery.worker';
+
+/**
+ * Sends the due webhook deliveries of the given subscriptions - and nothing
+ * else, so e2e files running in parallel never send each other's
+ * deliveries. Without a worker, e2e tests call this after the request
+ * whose webhooks they want to assert. Returns how many were claimed.
+ */
+export function deliverWebhooks(
+  app: INestApplicationContext,
+  subscriptionIds: readonly string[],
+): Promise<number> {
+  return app.get(WebhookDeliveryWorker).drain({ subscriptionIds });
+}