fix(admin): 后台时间统一展示为 YYYY-MM-DD HH:mm:ss（formatDateTime 全页接入）

admin-frontend-vue/src/pages/account/UsersPage.vue

@@ -1,4 +1,5 @@
 <script setup lang="ts">
+import { formatDateTime } from '@/utils/datetime'
 import { computed, onMounted, reactive, ref } from 'vue'
 import { ElMessage, ElMessageBox } from 'element-plus'
 import type { AdminUser } from '@/types/admin'
@@ -164,7 +165,9 @@ onMounted(loadUsers)
           </template>
         </el-table-column>
         <el-table-column prop="creatorUsername" label="所属管理员" width="160" />
-        <el-table-column prop="createdAt" label="创建时间" width="180" />
+        <el-table-column prop="createdAt" label="创建时间" width="180">
+          <template #default="{ row }">{{ formatDateTime(row.createdAt) }}</template>
+        </el-table-column>
         <el-table-column label="操作" width="160" fixed="right">
           <template #default="{ row }">
             <el-button link type="primary" :disabled="!editableOf(row)" @click="openEdit(row)">编辑</el-button>