docs: 新增 3 月赞赏记录（勇敢的心 ￥19.99） (#544)

- 3 月合计 ￥89.95，累计收到 ￥1365.88
- 同步更新 README/README_EN 爱心汇聚 badge

Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>

README_EN.md

@@ -7,7 +7,7 @@
 <!-- ALL-CONTRIBUTORS-BADGE:END -->
 
 [![Philanthropy](https://img.shields.io/badge/Philanthropy-CNY%201610.00-brightgreen?style=flat-square)](./DONATIONS.md)
-[![Gratitude](https://img.shields.io/badge/Gratitude-CNY%201345.89-blue?style=flat-square)](./DONATIONS.md)
+[![Gratitude](https://img.shields.io/badge/Gratitude-CNY%201365.88-blue?style=flat-square)](./DONATIONS.md)
 [![Docker Pulls](https://img.shields.io/docker/pulls/xpzouying/xiaohongshu-mcp?style=flat-square&logo=docker)](https://hub.docker.com/r/xpzouying/xiaohongshu-mcp)
 
 MCP for RedNote (Xiaohongshu) platform.