feat: 优化skill管理器，可直接参考开源项目popskill

### 使用场景 / Use case

目前的skill管理器功能较为单一

### 当前问题 / Current limitation

可直接复刻我的开源项目：https://github.com/maojiebc/majia-Popskill

### 期望方案 / Proposed solution

_No response_

### 已考虑的替代方案 / Alternatives considered

_No response_

No files, tests, or entry points are named. Start by inspecting the current skill manager and comparing its behavior with the referenced Popskill project to define the scope. Done should mean an agreed set of capabilities and corresponding tests.

Written by the indexing model from the issue text.