feat: scaffold v2 project structure with Docker, FastAPI, and config

동작하는 최소 코드 수준의 v2 스캐폴딩:

- docker-compose.yml: postgres, fastapi, kordoc, frontend, caddy
- app/: FastAPI 백엔드 (main, core, models, ai, prompts)
- services/kordoc/: Node.js 문서 파싱 마이크로서비스
- gpu-server/: AI Gateway + GPU docker-compose
- frontend/: SvelteKit 기본 구조
- migrations/: PostgreSQL 초기 스키마 (documents, tasks, processing_queue)
- tests/: pytest conftest 기본 설정
- config.yaml, Caddyfile, credentials.env.example 갱신

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

app/requirements.txt

@@ -0,0 +1,16 @@
+fastapi>=0.110.0
+uvicorn[standard]>=0.27.0
+sqlalchemy[asyncio]>=2.0.0
+asyncpg>=0.29.0
+pgvector>=0.3.0
+python-dotenv>=1.0.0
+pyyaml>=6.0
+httpx>=0.27.0
+python-jose[cryptography]>=3.3.0
+passlib[bcrypt]>=1.7.4
+pyotp>=2.9.0
+caldav>=1.3.0
+apscheduler>=3.10.0
+anthropic>=0.40.0
+markdown>=3.5.0
+python-multipart>=0.0.9