fix: SystemPage.vue 补全缺失的 template 闭合标签

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

frontend/web-admin/src/views/SystemPage.vue

@@ -579,6 +579,9 @@
         </table>
         <PaginationBar v-model:currentPage="menuPagination.pageNo" v-model:pageSize="menuPagination.pageSize" :total="menuPagination.total" />
       </div>
+    </section>
+  </section>
+</template>
 
 <script setup>
 /**