docs: update license information in readme files

- Add MIT License reference with link to LICENSE file
- Add copyright notice for go-zero team
- Update both English and Chinese documentation

Author: kevwan

readme.md

@@ -401,4 +401,6 @@ Feel free to extend this tool with additional go-zero features such as:
 
 ## License
 
-This tool is provided as-is for educational and development purposes.
+MIT License - see [LICENSE](LICENSE) file for details.
+
+Copyright (c) 2025 go-zero team

readme_zh.md

@@ -472,6 +472,12 @@ go test -cover ./...
 
 如有问题或建议，请访问 [GitHub Issues](https://github.com/zeromicro/mcp-zero/issues)。
 
+## 许可证
+
+MIT License - 详见 [LICENSE](LICENSE) 文件。
+
+Copyright (c) 2025 go-zero team
+
 ---
 
 **开始使用 mcp-zero，让 AI 助力你的 go-zero 开发！** 🚀