docs: add maintainer note

CONTRIBUTING.md

@@ -1,5 +1,7 @@
 # Contributing to PageAgent
 
+> **[A note from the maintainer](https://github.com/alibaba/page-agent/issues/349)** — Please read before opening issues or PRs.
+
 ♥️ We welcome contributions from everyone.
 
 ## 🚀 Quick Start

README.md

@@ -77,7 +77,7 @@ For more programmatic usage, see [📖 Documentations](https://alibaba.github.io
 
 We welcome contributions from the community! Follow our instructions in [CONTRIBUTING.md](CONTRIBUTING.md) for setup and guidelines.
 
-Please read [Code of Conduct](docs/CODE_OF_CONDUCT.md) before contributing.
+Please read the [maintainer note](https://github.com/alibaba/page-agent/issues/349) and [Code of Conduct](docs/CODE_OF_CONDUCT.md) before opening issues or PRs.
 
 Contributions generated entirely by **bots or agents** without substantial human involvement will **not be accepted**.
 

docs/README-zh.md

@@ -74,7 +74,9 @@ await agent.execute('点击登录按钮')
 
 ## 🤝 贡献
 
-欢迎社区贡献！请参阅 [CONTRIBUTING.md](../CONTRIBUTING.md) 了解安装与贡献指南。请在贡献前阅读[行为准则](CODE_OF_CONDUCT.md)。
+欢迎社区贡献！请参阅 [CONTRIBUTING.md](../CONTRIBUTING.md) 了解安装与贡献指南。
+
+提交 issue 或 PR 之前，请先阅读[维护者说明](https://github.com/alibaba/page-agent/issues/349)和[行为准则](CODE_OF_CONDUCT.md)。
 
 我们不接受未经实质性人类参与、完全由 Bot 或 Agent 自动生成的代码，机器人账号可能被禁止参与互动。