feat(hud): 添加击杀信息生成器并优化页面加载体验

- 新增击杀信息生成器页面，支持CS2和CStrike两种游戏样式
- 引入字体文件用于击杀信息渲染
- 添加多种骨架屏组件（AuthSkeleton、PageSkeleton等）改善加载体验
- 更新依赖包，新增html-to-image、react-icons等库
- 优化现有组件的样式和导入路径
- 统一使用@别名导入模块

web/src/components/LoadingFallback.tsx

@@ -0,0 +1,20 @@
+import { useLocation } from "react-router-dom";
+import { AuthSkeleton } from "./AuthSkeleton";
+import { PageSkeleton } from "./PageSkeleton";
+
+export function LoadingFallback() {
+  const location = useLocation();
+  const path = location.pathname;
+
+  if (path === "/login" || path === "/register") {
+    return <AuthSkeleton />;
+  }
+  
+  // For Kill Generation (DeathMsg) or other HUD tools
+  if (path.startsWith("/hud") || path.startsWith("/demo")) {
+    return <PageSkeleton />;
+  }
+
+  // Default fallback (Home, About, etc.)
+  return <PageSkeleton />;
+}