feat(service): NestJS kernel skeleton + 10-table kernel schema (P1.1+1.2)

Reuses support-service bootstrap/health/prisma patterns. Kernel-only Prisma
schema (scope/source_handle/actor/channel/thread/participant/interaction/
message_part/outbox/processed_event) with orgId/appId NOT NULL and
@@unique([scopeId, idempotencyKey]). Health verified: {status:ok,db:true}.

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

packages/iios-service/src/main.ts

@@ -0,0 +1,18 @@
+import 'reflect-metadata';
+import { NestFactory } from '@nestjs/core';
+import { ValidationPipe } from '@nestjs/common';
+import { AppModule } from './app.module';
+
+async function bootstrap(): Promise<void> {
+  const app = await NestFactory.create(AppModule);
+  app.useGlobalPipes(
+    new ValidationPipe({ whitelist: true, forbidNonWhitelisted: true, transform: true }),
+  );
+  app.enableCors({ origin: true, credentials: true });
+  const port = Number(process.env.PORT ?? 3200);
+  await app.listen(port);
+  // eslint-disable-next-line no-console
+  console.log(`iios-service listening on :${port}`);
+}
+
+void bootstrap();