- 改进 parse_case_attributes 使用 item.iter_markers() 包含全层级 mark
- 实现 tags 的多层级收集（模块/类/函数）与去重逻辑
- 支持 owner/extra_attributes/coding_testcase_id 的正确解析
- 移除 getattr/hasattr，改用 try/except 与直接属性访问
- 新增测试用例验证多层级 mark 解析功能
- 添加集成测试在 test_collector.py 中验证实际解析结果

- Update project version and testtool.yaml to 0.1.73
- Regenerate uv.lock with updated dependency metadata (upload-time metadata)
- Update requirements.txt with enhanced dependency documentation
- Update CHANGELOG.md with multi-layer marker collection feature

This release includes support for parsing module/class/function level markers
with proper deduplication in test case attributes.