fix(admin): 观看时间统一格式化为 yyyy-MM-dd HH:mm:ss

后端改输出格式后仍保留前端兜底，同时修掉用户详情里的原始 ISO 展示。

src/views/userManagement/AppUsersView.vue

@@ -9,6 +9,7 @@ import { useRbac } from '@/stores/rbac'
 import {
   APP_USER_STATUS,
   COUNTRY_OPTIONS,
+  formatDateTime,
   formatDuration,
   statusMeta,
   systemText,
@@ -312,7 +313,9 @@ function canBeBanned(row) {
                 SOURCE_TEXT[row.source] || row.source || '—'
               }}</template>
             </el-table-column>
-            <el-table-column prop="watchedAt" label="时间" width="160" show-overflow-tooltip />
+            <el-table-column label="时间" width="160">
+              <template #default="{ row }">{{ formatDateTime(row.watchedAt) }}</template>
+            </el-table-column>
           </el-table>
         </div>