4端合并交付:理解确认书+架构设计+MF Shell/Remote架构+4端差异化对照表 AI Agent: ai07 (4 portals) Branch: docs/teacher-portal-stage1-stage2-design-ai07
4端合并交付:理解确认书+架构设计+MF Shell/Remote架构+4端差异化对照表 AI Agent: ai07 (4 portals) Branch: docs/teacher-portal-stage1-stage2-design-ai07