docs: fix broken Star History chart (#606)

The Star History chart in the README and the English README is currently broken and no longer renders, leaving readers without a way to track the project's growth. Point the chart at a working endpoint so it displays correctly again.

Co-authored-by: OctoBored <212877535+OctoBored@users.noreply.github.com>

Author: OctoBored

README-en.md

@@ -109,7 +109,7 @@ This project is licensed under the Apache License 2.0.
 
 ## Star History
 
-[![Star History Chart](https://api.star-history.com/svg?repos=spring-ai-alibaba/DataAgent&type=Date)](https://star-history.com/#spring-ai-alibaba/DataAgent&Date)
+[![Star History Chart](https://star-history.dera.page/svg?repos=spring-ai-alibaba/DataAgent&type=Date)](https://star-history.dera.page/#spring-ai-alibaba/DataAgent&Date)
 
 ## Contributors
 

README.md

@@ -108,7 +108,7 @@ pnpm install && pnpm dev
 本项目采用 Apache License 2.0 许可证。
 ## Star 历史
 
-[![Star History Chart](https://api.star-history.com/svg?repos=spring-ai-alibaba/DataAgent&type=Date)](https://star-history.com/#spring-ai-alibaba/DataAgent&Date)
+[![Star History Chart](https://star-history.dera.page/svg?repos=spring-ai-alibaba/DataAgent&type=Date)](https://star-history.dera.page/#spring-ai-alibaba/DataAgent&Date)
 
 ## 贡献者名单