sync: 同步最新呼籁官网代码到仓库

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

layouts/default.vue

@@ -0,0 +1,41 @@
+<template>
+  <div class="app-layout">
+    <a href="#main-content" class="sr-only skip-link">跳转到主要内容</a>
+    <LayoutAppHeader />
+    <main id="main-content" class="app-main">
+      <slot />
+    </main>
+    <LayoutAppFooter />
+  </div>
+</template>
+
+<style lang="less" scoped>
+.app-layout {
+  display: flex;
+  flex-direction: column;
+  min-height: 100vh;
+}
+
+.app-main {
+  flex: 1;
+}
+
+.skip-link {
+  &:focus {
+    position: fixed;
+    top: @space-sm;
+    left: @space-sm;
+    z-index: 200;
+    width: auto;
+    height: auto;
+    padding: @space-sm @space-md;
+    background: @color-primary;
+    color: #fff;
+    font-size: @font-size-sm;
+    border-radius: @border-radius-md;
+    clip: auto;
+    white-space: normal;
+    overflow: visible;
+  }
+}
+</style>