feat: 添加新的 Sakai Vue 布局和样式，重构基础样式，更新 README，调整插件配置

src/layouts/sakai-vue/AppSidebar.vue

@@ -0,0 +1,11 @@
+<script setup lang="ts">
+import AppMenu from './AppMenu.vue';
+</script>
+
+<template>
+  <div class="layout-sidebar">
+    <app-menu></app-menu>
+  </div>
+</template>
+
+<style lang="scss" scoped></style>