首页刊头改用毛体草书(刘建毛草)

- 引入国内可访问的 jsDelivr CDN 字体:Liu Jian Mao Cao(毛体草书)
- 通过 @font-face 注册,font-display:swap 避免阻塞
- 离线回退到系统楷体(KaiTi)

Co-Authored-By: new-provider/LongCat-2.0 <<EMAIL>>
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frontend/src/index.css

@@ -2,6 +2,13 @@
 @tailwind components;
 @tailwind utilities;
 
+/* 毛体草书(刘建毛草) - 国内 CDN */
+@font-face {
+  font-family: 'Liu Jian Mao Cao';
+  src: url('https://cdn.jsdelivr.net/gh/google/fonts@main/ofl/liujianmaocao/LiuJianMaoCao-Regular.ttf') format('truetype');
+  font-display: swap;
+}
+
 @layer base {
   html {
     -webkit-text-size-adjust: 100%;