system_id,system_name,type,protocol,direction,description,phase
EXT-FS-DESIGN,设计文件目录,filesystem,file I/O,bidirectional,读写 design/ 目录下的 CSV/MD/YAML/OpenAPI 文件,MVP
EXT-FS-CODE,代码仓库目录,filesystem,file I/O,inbound (read-only),读取项目代码目录结构用于实现进度扫描,Phase2
EXT-FS-REGISTRY,项目注册表,data file,JSON read/write,bidirectional,项目注册信息持久化（~/.arch-design-dashboard/projects.json）,MVP
EXT-LLM,LLM 服务,api,HTTP,outbound,调用 LLM 评估模块实现完成度,Phase2