Merge feat/erp-inventar-export: read-only inventory mirror for ERPNext

Brings the ERPNext inventory export (T8) into main after its review:
strict seit format, settle window on the DB clock, BatchMovement
(createdAt, id) index, one scope per new API key and the failed-attempt
lockout on the shared throttler storage. Conflicts resolved in the
permission catalog (System and ERP-Anbindung groups) and ARCHITECTURE.md
(lockout is Annahme 30).

Gates on the merged state: backend lint, typecheck, 1909 unit, 471 e2e,
build, no schema drift; frontend 929 tests, lint, typecheck, build.

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

ApiCore-Backend/src/app.module.ts

@@ -51,6 +51,7 @@ import { ProfileModule } from './profile/profile.module';
 import { SiteSettingsModule } from './site-settings/site-settings.module';
 import { BackupModule } from './backup/backup.module';
 import { ShopSyncModule } from './shop-sync/shop-sync.module';
+import { ErpExportModule } from './erp-export/erp-export.module';
 import { ApiKeysModule } from './api-keys/api-keys.module';
 import { SystemModule } from './system/system.module';
 import { JwtAuthGuard } from './auth/guards/jwt-auth.guard';
@@ -116,6 +117,7 @@ import { IdempotencyInterceptor } from './common/idempotency/idempotency.interce
     SiteSettingsModule,
     BackupModule,
     ShopSyncModule,
+    ErpExportModule,
     ApiKeysModule,
     SystemModule,
   ],