首页「先知」刊头改用毛笔字艺术字体

- 引入 Google Fonts「Ma Shan Zheng」(马善政毛笔楷书)
- Tailwind 新增 font-brush 字体族
- 首页 + 积分榜页 + 后台侧边栏的「先知」均改为毛笔字
- 字号加大(text-5xl / text-6xl),去除 tracking,突出书法韵味

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

@@ -33,7 +33,7 @@ function StandingsLayout({ children }: { children: React.ReactNode }) {
       <header className="masthead-rule">
         <div className="mx-auto max-w-5xl px-5 sm:px-8">
           <div className="border-b border-ink-900 py-5 text-center sm:py-6">
-            <h1 className="font-serif text-4xl font-bold tracking-widest text-ink-900">
+            <h1 className="font-brush text-5xl text-ink-900 sm:text-6xl">
               先知
               <span className="ml-3 align-baseline font-serif text-base font-normal italic tracking-normal text-ink-500">
                 Profeto
@@ -80,7 +80,7 @@ function HomePage() {
       <header className="masthead-rule">
         <div className="mx-auto max-w-5xl px-5 sm:px-8">
           <div className="border-b border-ink-900 py-5 text-center sm:py-6">
-            <h1 className="font-serif text-4xl font-bold tracking-widest text-ink-900">
+            <h1 className="font-brush text-5xl text-ink-900 sm:text-6xl">
               先知
               <span className="ml-3 align-baseline font-serif text-base font-normal italic tracking-normal text-ink-500">
                 Profeto