feat(embed-slots): soft-delete slots — admin entry, ov shutdown via enabled=false snapshot

- 契约 deleteEmbedSlot（DELETE /admin/embed-slots/{id} → 204 幂等；admin 专属）
- cn schema：embed_slots.deletedAt（迁移 20260923120000，本地已应用）
- softDelete：乐观锁 claim + outbox slot.updated（payload enabled 强制 false
  ——ov 副本无墓碑，enabled=false 快照即公开端 404 下线；priority=high）+ audit
- 列表/加载/更新过滤 deletedAt → 同码 404
- Admin 列表操作「删除」（确认：已接入网站将停止展示、不可恢复）
- API 56/56、admin 87/87 + build 全绿

Co-Authored-By: Claude Code <noreply@anthropic.com>

apps/admin/src/views/system/embed-slots/index.vue

@@ -89,6 +89,9 @@
             <ElButton link type="primary" data-test="slot-code-btn" @click="openCode(row)">
               {{ $t('embedSlotsManage.list.actionCode') }}
             </ElButton>
+            <ElButton link type="danger" data-test="slot-delete-btn" @click="remove(row)">
+              {{ $t('embedSlotsManage.list.actionDelete') }}
+            </ElButton>
           </template>
         </ElTableColumn>
 
@@ -124,11 +127,11 @@
 <script setup lang="ts">
   import { onMounted, ref } from 'vue'
   import { useI18n } from 'vue-i18n'
-  import { ElMessage } from 'element-plus'
+  import { ElMessage, ElMessageBox } from 'element-plus'
   import SlotFormDialog from './SlotFormDialog.vue'
   import SlotBindDialog from './SlotBindDialog.vue'
   import EmbedCodeDialog from './EmbedCodeDialog.vue'
-  import { fetchEmbedSlots, fetchUpdateEmbedSlot } from '@/api/embedSlots'
+  import { fetchDeleteEmbedSlot, fetchEmbedSlots, fetchUpdateEmbedSlot } from '@/api/embedSlots'
   import { useCursorList } from '@/views/albums/composables/useCursorList'
   import { formatDateTime } from '@/utils/albums/format'
 
@@ -207,6 +210,26 @@
     codeVisible.value = true
   }
 
+  /** 软删除：确认（已接入网站将停止展示）→ DELETE → 重载列表 */
+  async function remove(row: Api.EmbedSlot.Item): Promise<void> {
+    try {
+      await ElMessageBox.confirm(
+        t('embedSlotsManage.list.deleteConfirm', { name: row.name }),
+        t('common.tips'),
+        {
+          type: 'warning',
+          confirmButtonText: t('common.confirm'),
+          cancelButtonText: t('common.cancel')
+        }
+      )
+    } catch {
+      return // 用户取消
+    }
+    await fetchDeleteEmbedSlot(row.id)
+    ElMessage.success(t('embedSlotsManage.list.deleted'))
+    loadFirst()
+  }
+
   onMounted(() => {
     void loadFirst()
   })