feat(admin): 观看/收藏/点赞列表单独增加系统列

用户单元格只保留身份信息，Android/iOS 抽成独立「系统」列，三页列结构一致。

src/views/userManagement/LikesView.vue

@@ -6,6 +6,7 @@ import dayjs from 'dayjs'
 import PageHeading from '@/views/components/PageHeading.vue'
 import AppUserCell from '@/views/components/AppUserCell.vue'
 import { pageLikesApi } from '@/api/admin/engagement'
+import { platformText } from './composables/useAppUsers'
 
 const PAGE_SIZES = [10, 20, 50]
 const TARGET_OPTIONS = [
@@ -133,6 +134,9 @@ onMounted(load)
           <AppUserCell :row="row" />
         </template>
       </el-table-column>
+      <el-table-column label="系统" width="100">
+        <template #default="{ row }">{{ platformText(row) }}</template>
+      </el-table-column>
       <el-table-column label="目标类型" width="110">
         <template #default="{ row }">{{ typeText(row.targetType) }}</template>
       </el-table-column>