pref:修改404页面

portal-manager-ui/admin/src/views/NotFoundView/NotFoundView.vue

 <template>
-  <div style="text-align: center">NotFoundPage</div>
+  <div class="view">
+    <a-result
+      status="404"
+      title="404"
+      sub-title="Sorry, the page you visited does not exist."
+    >
+      <template #extra>
+        <a-button type="primary" @click="$router.push('/home')">
+          返回首页
+        </a-button>
+      </template>
+    </a-result>
+  </div>
 </template>
 
 <script>
@@ -17,4 +29,11 @@ export default {
 </script>
 
 <style lang="less" scoped>
+.view {
+  width: 100%;
+  height: 100%;
+  display: flex;
+  flex-direction: column;
+  justify-content: center;
+}
 </style>
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