feat(10-04): implement TenderIngestionService — day-cursor gate, upsert change-detect, D-05 retention

- pollDueSources(): singleton doe-opendata config via findUnique (fixed slug,
  not findFirst); day-cursor gate (nextDayToFetch) no-ops when nothing new
  (Pitfall A); catch-up loop from lastIngestedDay+1 to today-1 with a polite
  1.5s delay between successive day-fetches
- prisma.tender.upsert({ where: { dedupKey } }) — SCHEMA-02 change-detection
  seam: identical notice does not duplicate, changed contentHash updates in
  place
- pruneExpiredTenders(): marks active+past-deadline rows 'expired', deletes
  expired rows older than 90 days, never touches deadlineAt=null rows (D-05)
- Plain PrismaService throughout — no tenant RLS extension on the global
  Tender/TenderSourcePollConfig tables (D-03, T-10-09)
- Registered in TendersModule.providers

apps/api/src/tenders/tenders.module.ts

@@ -4,16 +4,19 @@ import { ModuleRegistryService } from '../module-registry/module-registry.servic
 import { PrismaService } from '../prisma/prisma.service';
 import { DoeOpenDataAdapter } from './adapters/doe-opendata.adapter';
 import { seedTendersModule } from './tenders.seed';
+import { TenderIngestionService } from './tender-ingestion.service';
 import { TenderNormalizerService } from './tender-normalizer.service';
 
 /**
  * NestJS module for the Ausschreibungs-Radar feature.
  *
  * Wave 2 registered the module in the marketplace and seeded the
- * singleton DÖE poll config so the shared poll is admin-drivable. This
- * plan (03) adds the DÖE source adapter + normalizer (parse+map core of
- * INGEST-01/SCHEMA-01). Ingestion orchestration/scheduler/controller
- * wiring is added in Plans 04-05.
+ * singleton DÖE poll config so the shared poll is admin-drivable. Plan 03
+ * added the DÖE source adapter + normalizer (parse+map core of
+ * INGEST-01/SCHEMA-01). This plan (04) adds ingestion orchestration
+ * (TenderIngestionService: day-cursor gate, SCHEMA-02 change detection,
+ * D-05 retention) and the shared global scheduler. Controller/DTO wiring
+ * is added in Plan 05.
  *
  * PrismaModule is global (no explicit import needed).
  *
@@ -23,7 +26,7 @@ import { TenderNormalizerService } from './tender-normalizer.service';
 @Module({
   imports: [ModuleRegistryModule],
   controllers: [],
-  providers: [DoeOpenDataAdapter, TenderNormalizerService],
+  providers: [DoeOpenDataAdapter, TenderNormalizerService, TenderIngestionService],
 })
 export class TendersModule implements OnModuleInit {
   private readonly logger = new Logger(TendersModule.name);