feat(docs): add VisionCoder sponsorship details and optimize external links

- Added VisionCoder sponsorship information to `README.md`, `README_CN.md`, and `README_JA.md`.
- Updated external links to include `target="_blank"` for improved user experience.
- Added new logo asset `visioncoder.png` for README use.

README.md

@@ -42,6 +42,12 @@ Get 10% OFF GLM CODING PLAN：https://z.ai/subscribe?ic=8JVLJQFSKB
 <td width="180"><a href="https://poixe.com/i/m8kvep"><img src="./assets/poixeai.png" alt="PoixeAI" width="150"></a></td>
 <td>Thanks to Poixe AI for sponsoring this project! Poixe AI provides reliable LLM API services. You can leverage the platform's API endpoints to seamlessly build AI-powered products. Additionally, you can become a vendor by providing AI API resources to the platform and earn revenue. Register through the exclusive CLIProxyAPI <a href="https://poixe.com/i/m8kvep">referral link</a> and receive a bonus of $5 USD on your first top-up.</td>
 </tr>
+<tr>
+<td width="180"><a href="https://coder.visioncoder.cn"><img src="./assets/visioncoder.png" alt="VisionCoder" width="150"></a></td>
+<td>Thanks to VisionCoder for supporting this project. <a href="https://coder.visioncoder.cn" target="_blank">VisionCoder Developer Platform</a> is a reliable and efficient API relay service provider, offering access to mainstream AI models such as Claude Code, Codex, and Gemini. It helps developers and teams integrate AI capabilities more easily and improve productivity.
+<p></p>
+VisionCoder is also offering our users a limited-time <a href="https://coder.visioncoder.cn" target="_blank">Token Plan</a> promotion: buy 1 month and get 1 month free.</td>
+</tr>
 </tbody>
 </table>