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/validation/update-dto-null-handling.spec.ts

@@ -22,6 +22,7 @@ import { UpdateQueenEvaluationDto } from '../../queens/dto/update-queen-evaluati
 import { UpdateQueenDto } from '../../queens/dto/update-queen.dto';
 import { UpdateRawMaterialLotDto } from '../../raw-materials/dto/update-raw-material-lot.dto';
 import { UpdateRoleDto } from '../../roles/dto/update-role.dto';
+import { UpdateSiteSettingsDto } from '../../site-settings/dto/update-site-settings.dto';
 import { UpdateStockItemDto } from '../../storage/dto/update-stock-item.dto';
 import { UpdateStorageContainerDto } from '../../storage/dto/update-storage-container.dto';
 import { UpdateSwarmControlCheckDto } from '../../swarm-control/dto/update-swarm-control-check.dto';
@@ -53,6 +54,7 @@ const contracts: Record<string, NullContract> = {
       'longitude',
       'address',
       'notes',
+      'publicLocationLabel',
     ],
   },
   UpdateAutomationRuleDto: {
@@ -152,6 +154,7 @@ const contracts: Record<string, NullContract> = {
       'weather',
       'temperature',
       'colonyStrength',
+      'broodFrames',
       'broodAmount',
       'broodPattern',
       'openBroodPresent',
@@ -243,6 +246,13 @@ const contracts: Record<string, NullContract> = {
     notNull: ['key', 'name', 'permissionKeys'],
     clearable: ['description'],
   },
+  // The link fields clear with "" (see the DTO), not null; originCountry is
+  // NOT NULL with a default.
+  UpdateSiteSettingsDto: {
+    dto: UpdateSiteSettingsDto,
+    notNull: ['originCountry'],
+    clearable: [],
+  },
   UpdateStockItemDto: {
     dto: UpdateStockItemDto,
     notNull: ['name', 'category', 'unit', 'quantity'],