feat: platform backbone and field capture, first part (checkpoint)

Platform backbone (plan 2026-10-13-plattform-rueckgrat), reviewed tasks:
- run roles api/worker/job/all with shared startup checks (Task 1)
- schema and migration for DomainEvent, deliveries, JobRun, ThrottlerHit (Task 2)
- audit, notifications and domain events written in the same transaction (Task 3)
- dispatcher with SKIP LOCKED claims, retries and stale release (Task 4)
- worker building blocks: tick, LISTEN/NOTIFY wake-up, health (Task 5)
- worker process and entry points (Task 6)
- throttler counters in Postgres (Task 19)
- separate keys per purpose with key ring (Task 20)
- public origin page without exact location (Task 22)
- shop keys split into read and write (Task 23)
- Kustomize base, components, overlay encry, CI validation (Task 26)

Field capture T3 (plan 2026-10-13-t3-erfassung-am-stand), reviewed tasks:
- brood frames, read endpoints, apiary overview and offline pack
- network basics, offline queue v3, navigation sheets, form building blocks
- new inspection with last-time hints and weather, varroa per day,
  treatment prefill, apiary page with round
- inspection photo (Task 10) is implemented, review pending

Not rolled out. Remaining tasks follow in later commits.

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

ApiCore-Backend/src/common/retry-policy.spec.ts

@@ -0,0 +1,29 @@
+import {
+  MAX_ATTEMPTS,
+  RETRY_DELAYS_MS,
+  retryDelayMs,
+  STALE_CLAIM_MS,
+} from './retry-policy';
+
+describe('retry policy', () => {
+  it('waits 30 s, 2 min, 10 min, 1 h and from the 5th failure on 6 h', () => {
+    expect([1, 2, 3, 4, 5, 6, 7].map(retryDelayMs)).toEqual([
+      30_000, 120_000, 600_000, 3_600_000, 21_600_000, 21_600_000, 21_600_000,
+    ]);
+  });
+
+  it('gives up after 8 attempts and treats a claim older than 5 min as stale', () => {
+    expect(MAX_ATTEMPTS).toBe(8);
+    expect(STALE_CLAIM_MS).toBe(300_000);
+    expect(RETRY_DELAYS_MS).toEqual([
+      30_000, 120_000, 600_000, 3_600_000, 21_600_000,
+    ]);
+  });
+
+  it.each([0, -1, 1.5, Number.NaN])(
+    'refuses %p failed attempts - a delay exists only after a failure',
+    (attempts) => {
+      expect(() => retryDelayMs(attempts)).toThrow(RangeError);
+    },
+  );
+});