{"message":"PCB 设计工作流 API","version":"0.3.0","endpoints":{"GET /":"前端页面","POST /api/requirement":"需求分析（返回包含 status）","POST /api/requirement_analysis_stream":"需求分析（流式返回，实时推送进度）","POST /api/system_design":"系统设计","POST /api/system_design_stream":"系统设计（流式返回，实时推送进度）","POST /api/device_selection":"器件选型全流程（分类映射、参数估计、预算分配、器件选型）","POST /api/device_select_stream":"器件选型全流程（流式返回，实时推送各步骤进度）","POST /api/netlist_generation":"网表生成","POST /api/netlist_generation_stream":"网表生成（流式返回，每个模块完成时立即返回）","POST /api/top_port_merge":"顶层端口合并","GET /docs":"API 文档（Swagger UI）"}}