## Description

Brief description of the changes in this PR.

## Type of Change

- [ ] Bug fix (non-breaking change which fixes an issue)
- [ ] New feature (non-breaking change which adds functionality)
- [ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)
- [ ] Documentation update
- [ ] Refactoring (no functional changes)
- [ ] Performance improvement

## Related Issues

Fixes #(issue number)

## 测试检查清单

- [ ] 新增了哪些测试文件/测试用例?
- [ ] 纯逻辑部分是否有 L1 单元测试? (`tests/unit/`)
- [ ] 组件交互是否有 L2 测试? (`tests/component/`, Mock LLM)
- [ ] 如果涉及 API/通道，是否有 L3 集成测试? (`tests/integration/`)
- [ ] 是否录制了 LLM 响应用于 E2E 回放? (`tests/e2e/`)
- [ ] 修复 bug 时是否先写了复现该 bug 的测试?

## How Has This Been Tested?

Describe the tests that you ran to verify your changes.

- [ ] L1 Unit tests (`pytest tests/unit/`)
- [ ] L2 Component tests (`pytest tests/component/`)
- [ ] L3 Integration tests (`pytest tests/integration/`)
- [ ] L4 E2E tests (`pytest tests/e2e/`)
- [ ] Manual testing

## Test Configuration

- Python version:
- OS:

## Checklist

- [ ] My code follows the project's coding standards
- [ ] I have performed a self-review of my code
- [ ] I have commented my code, particularly in hard-to-understand areas
- [ ] I have made corresponding changes to the documentation
- [ ] My changes generate no new warnings
- [ ] I have added tests that prove my fix is effective or that my feature works
- [ ] New and existing unit tests pass locally with my changes
- [ ] Any dependent changes have been merged and published

## Screenshots (if applicable)

Add screenshots to help explain your changes.

## Additional Notes

Any additional information that reviewers should know.
