docs(readme): add sponsors section featuring 星辰·AI

Adds a Sponsors section to both README files, structured after sub2api's
sponsor table layout. Lists 星辰·AI (https://ai.centos.hk) as the
inaugural sponsor.

Author: james-6-23

README.md

@@ -82,6 +82,7 @@ Run it as a full **PostgreSQL + Redis** production stack or as a single-containe
 - [Core Capabilities](#core-capabilities)
 - [Project Structure](#project-structure)
 - [Notes](#notes)
+- [Sponsors](#sponsors)
 - [Disclaimer and License](#disclaimer-and-license)
 - [Star History](#star-history)
 - [Links](#links)
@@ -453,6 +454,19 @@ codex2api/
 
 ---
 
+## Sponsors
+
+> Want to appear here? Open an issue on GitHub.
+
+<table>
+<tr>
+<td width="180" align="center" valign="middle"><a href="https://ai.centos.hk"><b>星辰·AI</b></a></td>
+<td valign="middle">Thanks to <b><a href="https://ai.centos.hk">星辰·AI</a></b> for sponsoring this project! 星辰·AI provides stable and high-speed relay services for Claude Code / Codex / Gemini, suitable for both individual developers and teams.</td>
+</tr>
+</table>
+
+---
+
 ## Disclaimer and License
 
 - This project is for learning, research, and technical discussion only.

README.zh-CN.md

@@ -83,6 +83,7 @@
 - [核心能力](#核心能力)
 - [目录结构](#目录结构)
 - [常见注意事项](#常见注意事项)
+- [赞助商](#赞助商)
 - [免责声明](#免责声明与开源协议)
 - [Star History](#star-history)
 - [友情链接](#友情链接)
@@ -518,6 +519,19 @@ codex2api/
 
 ---
 
+## 赞助商
+
+> 想出现在这里？请到 GitHub 提交 Issue 联系。
+
+<table>
+<tr>
+<td width="180" align="center" valign="middle"><a href="https://ai.centos.hk"><b>星辰·AI</b></a></td>
+<td valign="middle">感谢 <b><a href="https://ai.centos.hk">星辰·AI</a></b> 赞助了本项目！星辰·AI 提供稳定、高速的 Claude Code / Codex / Gemini 中转服务，面向个人开发者与团队均适用。</td>
+</tr>
+</table>
+
+---
+
 ## 免责声明与开源协议
 
 - 本项目仅供学习、研究与技术交流使用。