fix(docs): update contribution guidelines in README files

Author: lcomplete

README.md

@@ -120,8 +120,12 @@ See the [Run the Server wiki](https://github.com/lcomplete/huntly/wiki/Run-the-S
 
 ## Contributing
 
-> [!IMPORTANT]
-> All Pull Requests must target the `dev` branch.
+Contributions are welcome.
+
+- Check existing issues and pull requests before starting to avoid duplicate work.
+- Open an issue or discussion first for larger changes so the approach can be aligned.
+- Keep pull requests focused and include a clear description, test notes, or screenshots when relevant.
+- Update related documentation and tests when your change affects behavior or user workflows.
 
 ## Become a Sponsor
 

README.zh.md

@@ -120,8 +120,12 @@ sudo xattr -r -d com.apple.quarantine /YOUR_PATH/Huntly.app
 
 ## 参与贡献
 
-> [!IMPORTANT]
-> 所有 Pull Request 必须提交到 `dev` 分支。
+欢迎提交贡献。
+
+- 开始之前先查看现有的 issue 和 pull request，避免重复工作。
+- 如果是较大的改动，建议先发起 issue 或 discussion，对齐方案后再开始。
+- 保持 pull request 聚焦，并在需要时补充清晰的说明、测试信息或截图。
+- 当改动影响功能行为或用户使用流程时，请同步更新相关文档和测试。
 
 ## 成为赞助者