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

src/app.controller.spec.ts

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+import { Test, TestingModule } from '@nestjs/testing';
+import { AppController } from './app.controller';
+import { AppService } from './app.service';
+
+describe('AppController', () => {
+  let appController: AppController;
+
+  beforeEach(async () => {
+    const app: TestingModule = await Test.createTestingModule({
+      controllers: [AppController],
+      providers: [AppService],
+    }).compile();
+
+    appController = app.get<AppController>(AppController);
+  });
+
+  describe('root', () => {
+    it('should return "Hello World!"', () => {
+      expect(appController.getHello()).toBe('Hello World!');
+    });
+  });
+});

src/app.controller.ts

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+import { Controller, Get } from '@nestjs/common';
+import { AppService } from './app.service';
+
+@Controller()
+export class AppController {
+  constructor(private readonly appService: AppService) {}
+
+  @Get()
+  getHello(): string {
+    return this.appService.getHello();
+  }
+}

src/app.module.ts

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+import { Module } from '@nestjs/common';
+import { ConfigModule } from '@nestjs/config';
+import configuration from './config/configuration';
+
+@Module({
+    imports: [
+        ConfigModule.forRoot({
+            load: [configuration],
+            isGlobal: true,
+        }),
+    ],
+})
+export class AppModule {}

src/app.service.ts

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+import { Injectable } from '@nestjs/common';
+
+@Injectable()
+export class AppService {
+  getHello(): string {
+    return 'Hello World!';
+  }
+}

src/config/configuration.ts

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+export default () => ({
+    port: parseInt(process.env.PORT ?? '4100', 10),
+    corsOrigin: process.env.CORS_ORIGIN ?? 'http://localhost:5173',
+    platform: {
+        graphqlUrl: process.env.PLATFORM_GRAPHQL_URL ?? 'http://localhost:4000/graphql',
+        apiKey: process.env.PLATFORM_API_KEY ?? '',
+    },
+    exotel: {
+        apiKey: process.env.EXOTEL_API_KEY ?? '',
+        apiToken: process.env.EXOTEL_API_TOKEN ?? '',
+        accountSid: process.env.EXOTEL_ACCOUNT_SID ?? '',
+        subdomain: process.env.EXOTEL_SUBDOMAIN ?? 'api.exotel.com',
+        webhookSecret: process.env.EXOTEL_WEBHOOK_SECRET ?? '',
+    },
+    ai: {
+        anthropicApiKey: process.env.ANTHROPIC_API_KEY ?? '',
+    },
+});

src/main.ts

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+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();