feat(P0-001): scaffold monorepo structure (#60)

Co-authored-by: Jason Woltje <jason@diversecanvas.com>
Co-committed-by: Jason Woltje <jason@diversecanvas.com>

apps/gateway/src/main.ts

@@ -0,0 +1,16 @@
+import 'reflect-metadata';
+import { NestFactory } from '@nestjs/core';
+import { FastifyAdapter, type NestFastifyApplication } from '@nestjs/platform-fastify';
+import { AppModule } from './app.module.js';
+
+async function bootstrap(): Promise<void> {
+  const app = await NestFactory.create<NestFastifyApplication>(AppModule, new FastifyAdapter());
+
+  await app.listen(4000, '0.0.0.0');
+  console.log('Gateway listening on port 4000');
+}
+
+bootstrap().catch((err: unknown) => {
+  console.error(err);
+  process.exit(1);
+});