feat: ✨ (keep-alive)优化页面缓存机制

- 重构 AppMain 组件，引入 KeepCache 组件实现统一缓存

- 新增 DemoDetail 组件作为缓存测试页面

- 更新 TagsView 组件，优化缓存路由逻辑

- 修改 permission.store.ts，增加 allCacheRoutes 状态管理

- 更新 tags-view.store.ts，实现缓存路由的动态设置

- 调整多级菜单示例，支持缓存功能

src/router/index.ts

@@ -64,6 +64,12 @@ export const constantRoutes: RouteRecordRaw[] = [
         component: () => import("@/views/system/notice/components/MyNotice.vue"),
         meta: { title: "我的通知", icon: "user", hidden: true },
       },
+      {
+        path: "/detail/:id(\\d+)",
+        name: "DemoDetail",
+        component: () => import("@/views/demo/detail.vue"),
+        meta: { title: "详情页缓存", icon: "user", hidden: true, keepAlive: true },
+      },
     ],
   },
 ];