Research a codebase and create architectural documentation describing how features or systems work. Use when the user asks to: (1) Document how a feature works, (2) Create an architecture overview, (3) Explain code structure for onboarding or knowledge transfer, (4) Research and describe a system's design. Produces markdown documents with Mermaid diagrams and stable code references suitable for humans and AI agents.

研究代码库并生成架构文档，说明功能或系统的运作方式。适用于用户要求：（1）记录功能的实现原理，（2）创建架构概览，（3）解释代码结构以协助新人入职或知识传递，（4）研究并描述系统的整体设计。输出包含Mermaid图表和稳定代码引用的Markdown文档，便于人类和AI代理阅读使用。