feat: add page components

src/views/error-page/404.vue

@@ -1,5 +1,5 @@
 <template>
-  <div h-full flex>
+  <AppPage>
     <n-result m-auto status="404" description="抱歉，您访问的页面不存在。">
       <template #icon>
         <img src="@/assets/images/404.webp" width="500" />
@@ -8,7 +8,7 @@
         <n-button @click="replace('/')">返回首页</n-button>
       </template>
     </n-result>
-  </div>
+  </AppPage>
 </template>
 
 <script setup>