📝 (README): Clearly define Github as SSOT

明确`Github`作为单一信源

README-CN.md

@@ -140,9 +140,9 @@ cargo add opensound
 
 ## 贡献
 
-[GitLab](https://gitlab.com/opensound-org/opensound)是我们的[单一信源](https://en.wikipedia.org/wiki/Single_source_of_truth)，[Github](https://github.com/opensound-org/opensound)版本只是一个只读镜像，因此请不要在Github版本上面发起任何pull requests。
+[Github](https://github.com/opensound-org/opensound)是我们的[单一信源](https://en.wikipedia.org/wiki/Single_source_of_truth)，这里我们欢迎所有的issue和pull request。
 
-[GitLab](https://gitlab.com/opensound-org/opensound)版本上面的合并请求是欢迎的！
+我们另有两个[自动推送](.github/workflows/mirror.yml)的下游只读镜像：[GitLab](https://gitlab.com/opensound-org/opensound)和[Gitee](https://gitee.com/opensound-org/opensound)。由于它们是只读镜像，因此请不要在这两个平台上发起任何合并请求或pull request。
 
 除非您另有明确说明，否则您有意提交的
 包含在 `opensound` 中的任何贡献（如 Apache-2.0 许可证中所定义）均应

README.md

@@ -140,9 +140,9 @@ at your option.
 
 ## Contribution
 
-[GitLab](https://gitlab.com/opensound-org/opensound) is our [single source of truth](https://en.wikipedia.org/wiki/Single_source_of_truth), and the [Github](https://github.com/opensound-org/opensound) version is a read-only mirror, so please do not initiate any pull requests in the Github version.
+[Github](https://github.com/opensound-org/opensound) is our [single source of truth](https://en.wikipedia.org/wiki/Single_source_of_truth), where we welcome all issues and pull requests.
 
-Merge requests are welcome on our [GitLab](https://gitlab.com/opensound-org/opensound) version!
+We also have two downstream read-only mirrors that are [automatically pushed](.github/workflows/mirror.yml): [GitLab](https://gitlab.com/opensound-org/opensound) and [Gitee](https://gitee.com/opensound-org/opensound). As they are read-only mirrors, please do not initiate any merge or pull requests on these two platforms.
 
 Unless you explicitly state otherwise, any contribution intentionally submitted
 for inclusion in `opensound` by you, as defined in the Apache-2.0 license, shall be