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/app.module.ts

@@ -0,0 +1,9 @@
+import { Module } from '@nestjs/common';
+import { PrismaModule } from './prisma/prisma.module';
+import { HealthController } from './health.controller';
+
+@Module({
+  imports: [PrismaModule],
+  controllers: [HealthController],
+})
+export class AppModule {}

packages/iios-service/src/health.controller.ts

@@ -0,0 +1,19 @@
+import { Controller, Get } from '@nestjs/common';
+import { PrismaService } from './prisma/prisma.service';
+
+@Controller('health')
+export class HealthController {
+  constructor(private readonly prisma: PrismaService) {}
+
+  @Get()
+  async check(): Promise<{ status: string; db: boolean }> {
+    let db = false;
+    try {
+      await this.prisma.$queryRaw`SELECT 1`;
+      db = true;
+    } catch {
+      db = false;
+    }
+    return { status: 'ok', db };
+  }
+}

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();

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

@@ -0,0 +1,9 @@
+import { Global, Module } from '@nestjs/common';
+import { PrismaService } from './prisma.service';
+
+@Global()
+@Module({
+  providers: [PrismaService],
+  exports: [PrismaService],
+})
+export class PrismaModule {}

packages/iios-service/src/prisma/prisma.service.ts

@@ -0,0 +1,9 @@
+import { Injectable, OnModuleInit } from '@nestjs/common';
+import { PrismaClient } from '@prisma/client';
+
+@Injectable()
+export class PrismaService extends PrismaClient implements OnModuleInit {
+  async onModuleInit(): Promise<void> {
+    await this.$connect();
+  }
+}