fix: update links in README files for better accessibility

- Changed links in both English and Chinese README files to point directly to the respective Contributing Guide documents on GitHub.

Author: gene9831

README.md

@@ -175,7 +175,7 @@ MIT License - see [LICENSE](https://github.com/opentiny/tiny-robot/blob/HEAD/LIC
 
 ## 🤝 Contributing
 
-Contributions are welcome! Please read our [Contributing Guide](./CONTRIBUTING.md) to understand the recommended workflow, commit message conventions, and how to submit Issues and Pull Requests.
+Contributions are welcome! Please read our [Contributing Guide](https://github.com/opentiny/tiny-robot/blob/HEAD/CONTRIBUTING.md) to understand the recommended workflow, commit message conventions, and how to submit Issues and Pull Requests.
 
 ## 📞 Support
 

README.zh-CN.md

@@ -175,7 +175,7 @@ MIT 许可证 - 查看 [LICENSE](https://github.com/opentiny/tiny-robot/blob/HEA
 
 ## 🤝 贡献
 
-欢迎贡献！请阅读[贡献指南](./CONTRIBUTING_zh.md)了解推荐的工作流程、Commit 规范以及如何提交 Issue 和 Pull Request。
+欢迎贡献！请阅读[贡献指南](https://github.com/opentiny/tiny-robot/blob/HEAD/CONTRIBUTING_zh.md)了解推荐的工作流程、Commit 规范以及如何提交 Issue 和 Pull Request。
 
 ## 📞 支持