n8n Task Runner 샌드박스 대응 및 워크플로우 업데이트

- CLAUDE.md: Task Runner VM 샌드박스 제약사항 문서화
- docker-compose.yml: NODE_FUNCTION_ALLOW_BUILTIN 환경변수 추가
- main-chat-pipeline.json: require('http/https/url') 방식으로 전환된 워크플로우 반영

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

docker-compose.yml

@@ -28,6 +28,7 @@ services:
       - LOCAL_OLLAMA_URL=${LOCAL_OLLAMA_URL}
       - GPU_OLLAMA_URL=${GPU_OLLAMA_URL}
       - QDRANT_URL=${QDRANT_URL:-http://host.docker.internal:6333}
+      - NODE_FUNCTION_ALLOW_BUILTIN=crypto,http,https,url
     volumes:
       - ./n8n/data:/home/node/.n8n
     networks: