feat(后台分组): 分组筛选与分组列仅超管可见，非超管一律隐藏

管理员/普通用户数据已由后端裁剪到本人可访问分组，分组维度对其无意义；
账号归属分组是超管职责，故只有超管需要按分组筛选与区分。

- 隐藏分组筛选+分组列：品牌数据库、查询ASIN、最低价ASIN、去重总数据、
  店铺管理、用户密钥
- 仅隐藏分组展示：店铺数据记录(筛选框+卡片行)、图片视频任务(所属分组行)、
  撞款检测(明细抽屉分组列+卡片分组标签)
- 弹窗分组选择保留展示但锁定：非超管仅1个可访问分组时自动选中并置灰
  (查询/最低价ASIN 另联动加载该分组店铺)，多分组不锁以免限制用户
- 空数据行 colspan 随列显隐动态化
- 新增 tests/align-group-visibility.test.ts 回归守卫(5 条)

admin-frontend-vue/src/pages/asin/DedupeRegistryPage.vue

@@ -24,6 +24,11 @@ import { importOutcomeText, importTaskFinished, isAllowedImportFile } from './de
 import type { DedupeImportProgress } from './dedupe-import-model.ts'
 import { toExportUrl } from './dedupe-total-export.ts'
 import OldPagination from '@/components/OldPagination.vue'
+import { useAdminSessionStore } from '@/stores/admin-session'
+
+const session = useAdminSessionStore()
+/** 仅超管需要分组维度：非超管数据由后端裁剪到本人分组，分组筛选/列一律不展示。 */
+const isSuperAdmin = computed(() => session.isSuperAdmin)
 
 const loading = ref(false)
 const rows = ref<DedupeTotalItem[]>([])
@@ -32,6 +37,11 @@ const page = ref(1)
 const pageSize = ref(10)
 const filter = reactive(createDedupeTotalFilterState())
 const groups = ref<DedupeGroupOption[]>([])
+/** 非超管仅有一个可访问分组时，编辑/导入弹窗分组选择锁定为该组（保留展示、不可改）。 */
+const lockedGroupId = computed<number | null>(() => {
+  if (isSuperAdmin.value) return null
+  return groups.value.length === 1 ? groups.value[0].id : null
+})
 const jumpPage = ref('')
 
 const totalPages = computed(() => Math.max(1, Math.ceil(total.value / pageSize.value)))
@@ -115,7 +125,7 @@ function changeSize(size: number) {
 function openEdit(row: DedupeTotalItem): void {
   editTarget.value = row
   editValue.value = row.dataValue
-  editGroupId.value = row.groupId
+  editGroupId.value = row.groupId ?? lockedGroupId.value
   editVisible.value = true
 }
 
@@ -157,7 +167,7 @@ async function removeRow(row: DedupeTotalItem): Promise<void> {
 }
 
 function resetImport(): void {
-  importGroupId.value = null
+  importGroupId.value = lockedGroupId.value
   importFile.value = null
   importProgress.value = ''
   importRunning.value = false
@@ -306,7 +316,7 @@ onMounted(() => {
           <label>用户名（模糊搜索）</label>
           <input v-model="filter.username" type="text" placeholder="输入用户名" @keyup.enter="apply" />
         </div>
-        <div class="form-group">
+        <div v-if="isSuperAdmin" class="form-group">
           <label>分组</label>
           <el-select v-model="filter.groupId" class="admin-filter" filterable clearable placeholder="全部分组">
             <el-option v-for="group in groups" :key="group.id" :label="group.name" :value="group.id" />
@@ -348,7 +358,7 @@ onMounted(() => {
               <th>ASIN</th>
               <th>国家</th>
               <th>用户名</th>
-              <th>分组</th>
+              <th v-if="isSuperAdmin">分组</th>
               <th>创建时间</th>
               <th>操作</th>
             </tr>
@@ -360,7 +370,7 @@ onMounted(() => {
                 <td class="mono-cell">{{ row.dataValue }}</td>
                 <td>{{ asinCountryLabel(row.country || '') }}</td>
                 <td>{{ row.username || '-' }}</td>
-                <td>{{ row.groupName || '未分组' }}</td>
+                <td v-if="isSuperAdmin">{{ row.groupName || '未分组' }}</td>
                 <td>{{ formatDateTime(row.createdAt) }}</td>
                 <td class="ops-cell">
                   <button class="btn btn-sm" type="button" @click="openEdit(row)">编辑</button>
@@ -369,10 +379,10 @@ onMounted(() => {
               </tr>
             </template>
             <tr v-else-if="loading">
-              <td colspan="7" class="empty-tip">加载中...</td>
+              <td :colspan="isSuperAdmin ? 7 : 6" class="empty-tip">加载中...</td>
             </tr>
             <tr v-else>
-              <td colspan="7" class="empty-tip">暂无总数据</td>
+              <td :colspan="isSuperAdmin ? 7 : 6" class="empty-tip">暂无总数据</td>
             </tr>
           </tbody>
         </table>
@@ -390,7 +400,7 @@ onMounted(() => {
         </div>
         <div class="form-group">
           <label>分组</label>
-          <select v-model="editGroupId">
+          <select v-model="editGroupId" :disabled="lockedGroupId != null">
             <option disabled :value="null">请选择分组</option>
             <option v-for="group in groups" :key="group.id" :value="group.id">{{ group.name }}</option>
           </select>
@@ -411,7 +421,7 @@ onMounted(() => {
         </div>
         <div class="form-group">
           <label>分组</label>
-          <select v-model="importGroupId" :disabled="importRunning">
+          <select v-model="importGroupId" :disabled="importRunning || lockedGroupId != null">
             <option disabled :value="null">请选择分组</option>
             <option v-for="group in groups" :key="group.id" :value="group.id">{{ group.name }}</option>
           </select>