feat(service): P5.3 inbound adapter pipeline (ACK-fast webhook + RawEventProjector) + traceId

POST /v1/adapters/:type/webhook verifies HMAC (fail-closed) -> stores raw ->
emits raw.received -> 202. RawEventProjector consumes it off the relay, normalizes
via the adapter, reuses IngestService (traceId threaded raw->interaction).
Deduped on (channelType, externalEventId). rawBody enabled. 48 tests.

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

packages/iios-service/src/main.ts

@@ -5,7 +5,7 @@ import { ValidationPipe } from '@nestjs/common';
 import { AppModule } from './app.module';
 
 async function bootstrap(): Promise<void> {
-  const app = await NestFactory.create(AppModule);
+  const app = await NestFactory.create(AppModule, { rawBody: true });
   app.useGlobalPipes(
     new ValidationPipe({ whitelist: true, forbidNonWhitelisted: true, transform: true }),
   );