README 增加 FanBox 宣传 banner（看得见的 vibe coding）

跨项目交叉宣传，点击跳转 alchaincyf/fanbox。

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

README.md

@@ -345,6 +345,15 @@ MIT License © [花叔 Huashu](https://github.com/alchaincyf)
 
 ---
 
+<div align="center">
+<sub>作者的其他项目 · also by 花叔</sub>
+
+[![FanBox · 看得见的 vibe coding](https://raw.githubusercontent.com/alchaincyf/fanbox/master/assets/promo-banner.png)](https://github.com/alchaincyf/fanbox)
+
+</div>
+
+---
+
 ## English
 
 > *"The next person you want to distill doesn't have to be a colleague."*