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/AppFooter.vue

@@ -0,0 +1,14 @@
+<script setup lang="ts"></script>
+
+<template>
+  <div class="layout-footer">
+    SAKAI by
+    <a
+      href="https://primevue.org"
+      target="_blank"
+      rel="noopener noreferrer"
+      class="text-primary font-bold hover:underline"
+      >PrimeVue</a
+    >
+  </div>
+</template>