docs: fix contributing links and polish localized wording

Signed-off-by: Bo <boironic@gmail.com>

README.md

@@ -251,7 +251,7 @@ Technical details live in the `docs/` folder:
 
 ## Contributing
 
-Please read **[docs/CONTRIBUTE.md](docs/CONTRIBUTE.md)** before opening issues or pull requests.
+Please read **[CONTRIBUTING.md](CONTRIBUTING.md)** before opening issues or pull requests.
 
 ## License
 

README_CN.md

@@ -266,7 +266,7 @@ MimiClaw 内置 cron 调度器，让 AI 可以自主安排任务。LLM 可以通
 
 ## Contributing
 
-Please read **[docs/CONTRIBUTE.md](docs/CONTRIBUTE.md)** before opening issues or pull requests.
+提交 Issue 或 Pull Request 前，请先阅读 **[CONTRIBUTING.md](CONTRIBUTING.md)**。
 
 ## 许可证
 

README_JA.md

@@ -251,7 +251,7 @@ MimiClawにはcronスケジューラが内蔵されており、AIが自律的に
 
 ## Contributing
 
-Please read **[docs/CONTRIBUTE.md](docs/CONTRIBUTE.md)** before opening issues or pull requests.
+Issue や Pull Request を作成する前に、**[CONTRIBUTING.md](CONTRIBUTING.md)** をご確認ください。
 
 ## ライセンス