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/treatments/treatments.controller.ts

@@ -14,6 +14,8 @@ import type { AuthenticatedUser } from '../auth/types/authenticated-user';
 import { CreateTreatmentDto } from './dto/create-treatment.dto';
 import { UpdateTreatmentDto } from './dto/update-treatment.dto';
 import { WithdrawalStatusQueryDto } from './dto/withdrawal-status-query.dto';
+import { LastByProductQueryDto } from './dto/last-by-product-query.dto';
+import { TreatmentPrefillService } from './treatment-prefill.service';
 import { TreatmentsService } from './treatments.service';
 import { Idempotent } from '../common/idempotency/idempotent.decorator';
 
@@ -21,7 +23,10 @@ import { Idempotent } from '../common/idempotency/idempotent.decorator';
 @ApiBearerAuth()
 @Controller('treatments')
 export class TreatmentsController {
-  constructor(private readonly treatmentsService: TreatmentsService) {}
+  constructor(
+    private readonly treatmentsService: TreatmentsService,
+    private readonly treatmentPrefillService: TreatmentPrefillService,
+  ) {}
 
   @RequirePermission('treatments:read')
   @Get()
@@ -39,6 +44,21 @@ export class TreatmentsController {
     );
   }
 
+  /** The caller's newest treatment with this product, to prefill a new one. */
+  @RequirePermission('treatments:create')
+  @Get('last-by-product')
+  async getLastByProduct(
+    @Query() query: LastByProductQueryDto,
+    @CurrentUser() actor: AuthenticatedUser,
+  ) {
+    return {
+      treatment: await this.treatmentPrefillService.lastByProduct(
+        actor.id,
+        query.product,
+      ),
+    };
+  }
+
   @RequirePermission('treatments:read')
   @Get(':id')
   findOne(@Param('id') id: string) {