perf: 懒加载表现优化

- 优化路由首进页面过渡策略，减少遮罩阻塞感

- 为菜单导航增加组件预取，降低首次点击等待

- 缩短页面 loading 遮罩过渡时长

easyflow-ui-admin/packages/@core/ui-kit/shadcn-ui/src/components/spinner/spinner.vue

@@ -63,7 +63,7 @@ function onTransitionEnd() {
   <div
     :class="
       cn(
-        'flex-center z-100 bg-overlay-content absolute left-0 top-0 size-full backdrop-blur-sm transition-all duration-500',
+        'flex-center z-100 bg-overlay-content absolute left-0 top-0 size-full backdrop-blur-sm transition-opacity duration-200',
         {
           'invisible opacity-0': !showSpinner,
         },