chore: scaffold NestJS sidecar with config, CORS, and dependency setup

src/main.ts

@@ -0,0 +1,18 @@
+import { NestFactory } from '@nestjs/core';
+import { AppModule } from './app.module';
+import { ConfigService } from '@nestjs/config';
+
+async function bootstrap() {
+    const app = await NestFactory.create(AppModule);
+    const config = app.get(ConfigService);
+
+    app.enableCors({
+        origin: config.get('corsOrigin'),
+        credentials: true,
+    });
+
+    const port = config.get('port');
+    await app.listen(port);
+    console.log(`Helix Engage Server running on port ${port}`);
+}
+bootstrap();