chore: migrate backend to monorepo apps and biome

apps/gateway/src/gateway.controller.spec.ts

@@ -0,0 +1,22 @@
+import { Test, TestingModule } from '@nestjs/testing';
+import { GatewayController } from './gateway.controller';
+import { GatewayService } from './gateway.service';
+
+describe('GatewayController', () => {
+  let gatewayController: GatewayController;
+
+  beforeEach(async () => {
+    const app: TestingModule = await Test.createTestingModule({
+      controllers: [GatewayController],
+      providers: [GatewayService],
+    }).compile();
+
+    gatewayController = app.get<GatewayController>(GatewayController);
+  });
+
+  describe('root', () => {
+    it('should return "Hello World!"', () => {
+      expect(gatewayController.getHello()).toBe('Hello World!');
+    });
+  });
+});

apps/gateway/src/gateway.controller.ts

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+import { Controller, Get } from '@nestjs/common';
+import { GatewayService } from './gateway.service';
+
+@Controller()
+export class GatewayController {
+  constructor(private readonly gatewayService: GatewayService) {}
+
+  @Get()
+  getHello(): string {
+    return this.gatewayService.getHello();
+  }
+}

apps/gateway/src/gateway.module.ts

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+import { Module } from '@nestjs/common';
+import { GatewayController } from './gateway.controller';
+import { GatewayService } from './gateway.service';
+
+@Module({
+  imports: [],
+  controllers: [GatewayController],
+  providers: [GatewayService],
+})
+export class GatewayModule {}

apps/gateway/src/gateway.service.ts

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

apps/gateway/src/main.ts

@@ -0,0 +1,8 @@
+import { NestFactory } from '@nestjs/core';
+import { GatewayModule } from './gateway.module';
+
+async function bootstrap() {
+  const app = await NestFactory.create(GatewayModule);
+  await app.listen(process.env.GATEWAY_PORT ?? 3001);
+}
+bootstrap();