first commit

backend/src/app.controller.ts

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+import { Controller, Get } from '@nestjs/common';
+import { ApiOperation, ApiTags } from '@nestjs/swagger';
+import { AppService } from './app.service';
+
+// 루트 컨트롤러 — 헬스체크/디버그 용 단순 엔드포인트
+@ApiTags('App')
+@Controller()
+export class AppController {
+  constructor(private readonly appService: AppService) {}
+
+  @Get('hello')
+  @ApiOperation({ summary: '동작 확인용 Hello World' })
+  getHello(): string {
+    return this.appService.getHello();
+  }
+}