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-Frontend/Dockerfile

@@ -1,6 +1,7 @@
 # syntax=docker/dockerfile:1
 
-FROM node:22-alpine AS builder
+# Base-Image per Digest gepinnt, derselbe wie im Backend (siehe dort).
+FROM node:22-alpine@sha256:0a7108bf6c7bf5de370ffb1a3ed6be93d405b43ff159f681a8d18c0e2bc2e402 AS builder
 WORKDIR /app
 COPY package.json package-lock.json ./
 RUN npm ci
@@ -11,7 +12,7 @@ RUN npx next typegen
 RUN npm run lint && npx tsc --noEmit && npm test
 RUN npm run build
 
-FROM node:22-alpine AS runtime
+FROM node:22-alpine@sha256:0a7108bf6c7bf5de370ffb1a3ed6be93d405b43ff159f681a8d18c0e2bc2e402 AS runtime
 ENV NODE_ENV=production
 WORKDIR /app
 COPY --from=builder /app/public ./public