docs(readme): add Community Tools section (#4114)

3x-ui has a growing ecosystem of community tools (Terraform, scripts,
exporters, etc.). This adds a Community Tools section between
Acknowledgment and Support project in all 6 localized READMEs so users
can discover them from the main project page.

The format mirrors the existing Acknowledgment section so future
maintainers of 3x-ui-related tools can extend it with one-line PRs.

README.zh_CN.md

@@ -39,6 +39,12 @@ bash <(curl -Ls https://raw.githubusercontent.com/mhsanaei/3x-ui/master/install.
 - [Iran v2ray rules](https://github.com/chocolate4u/Iran-v2ray-rules) (许可证: **GPL-3.0**): _增强的 v2ray/xray 和 v2ray/xray-clients 路由规则，内置伊朗域名，专注于安全性和广告拦截。_
 - [Russia v2ray rules](https://github.com/runetfreedom/russia-v2ray-rules-dat) (许可证: **GPL-3.0**): _此仓库包含基于俄罗斯被阻止域名和地址数据自动更新的 V2Ray 路由规则。_
 
+## 社区工具
+
+社区围绕 3x-ui 构建的工具和集成。
+
+- [terraform-provider-3x-ui](https://github.com/batonogov/terraform-provider-threexui) (许可证: **MIT**): _使用 Terraform / OpenTofu 通过代码管理入站、客户端、面板设置和 Xray 配置。_
+
 ## 支持项目
 
 **如果这个项目对您有帮助，您可以给它一个**:star2: