{"service":"屏方 CAD 图纸生成服务","status":"ok","usage":{"create_task":"POST /api/chat/cad-task","health":"GET /api/cad/health","status":"GET /api/cad/status/{task_id}","download":"GET /api/cad/file/{task_id}?expires=...&sig=..."},"output_dir":"/home/ubuntu/pingfang-cad-backend/output"}