message: fix(cli): demo keep-alive not work
diff: <template>
  <demo-nav />
  <router-view v-slot="{ Component }">
  - <keep-alive>
  <demo-section>
  + <keep-alive>
  <component :is="Component" />
  - </demo-section>
  </keep-alive>
  + </demo-section>
  </router-view>
  </template>
  