feat(service): outbox relay + thread read endpoint + replay (P1.5, P1 complete)

OutboxRelay: FOR UPDATE SKIP LOCKED claim, in-process bus publish, PENDING->
PUBLISHED with 30s backoff + idempotent-consumer ledger. GET /v1/threads/:id/
messages (policy-scoped). Replay + read specs green; vitest fileParallelism off
(shared DB). End-to-end HTTP smoke verified: idempotent ingest, read-back, 400
on missing key. 19 tests pass.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

packages/iios-service/src/app.module.ts

@@ -2,10 +2,12 @@ import { Module } from '@nestjs/common';
 import { PrismaModule } from './prisma/prisma.module';
 import { PlatformModule } from './platform/platform.module';
 import { InteractionsModule } from './interactions/interactions.module';
+import { OutboxModule } from './outbox/outbox.module';
+import { ThreadsModule } from './threads/threads.module';
 import { HealthController } from './health.controller';
 
 @Module({
-  imports: [PrismaModule, PlatformModule, InteractionsModule],
+  imports: [PrismaModule, PlatformModule, InteractionsModule, OutboxModule, ThreadsModule],
   controllers: [HealthController],
 })
 export class AppModule {}