feat: Drama Studio 프로젝트 초기 구조 설정

- FastAPI 백엔드 (audio-studio-api)
- Next.js 프론트엔드 (audio-studio-ui)
- Qwen3-TTS 엔진 (audio-studio-tts)
- MusicGen 서비스 (audio-studio-musicgen)
- Docker Compose 개발/운영 환경

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

audio-studio-ui/next-env.d.ts

@@ -0,0 +1,6 @@
+/// <reference types="next" />
+/// <reference types="next/image-types/global" />
+/// <reference path="./.next/types/routes.d.ts" />
+
+// NOTE: This file should not be edited
+// see https://nextjs.org/docs/app/api-reference/config/typescript for more information.