feat: 活动日志撤销+详情+排版优化

活动日志:
- 删除配方/用户/精油加撤销按钮
- 编辑配方记录修改了哪些字段（名称/成分/标签/备注/英文名）
- 创建标签记入日志
- 注册记入日志（已有）

配方卡片:
- 精油按字母排序
- 容量移到名字后面
- 标签对viewer不可见
- 管理配方标签排序+容量显示

其他:
- 管理员共享直接显示已共享
- 点击轮播清除搜索
- 编辑overlay防误关

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

frontend/src/views/AuditLog.vue

@@ -49,6 +49,7 @@
         <div class="log-detail">
           <span v-if="log.target_name" class="log-target-name">{{ log.target_name }}</span>
           <span v-if="parsedDetail(log)" class="log-extra">{{ parsedDetail(log) }}</span>
+          <button v-if="canUndo(log)" class="undo-btn" @click="undoAction(log)">↩ 撤销</button>
         </div>
       </div>
       <div v-if="filteredLogs.length === 0" class="empty-hint">暂无日志记录</div>
@@ -66,6 +67,10 @@
 <script setup>
 import { ref, computed, onMounted } from 'vue'
 import { api } from '../composables/useApi'
+import { showConfirm } from '../composables/useDialog'
+import { useUiStore } from '../stores/ui'
+
+const ui = useUiStore()
 
 const logs = ref([])
 const loading = ref(false)
@@ -158,6 +163,7 @@ function parsedDetail(log) {
     if (d.from_user) parts.push(`来自: ${d.from_user}`)
     if (d.reason) parts.push(`原因: ${d.reason}`)
     if (d.business_name) parts.push(`商户: ${d.business_name}`)
+    if (d.changed) parts.push(`修改: ${d.changed}`)
     if (d.display_name) parts.push(`显示名: ${d.display_name}`)
     if (d.original_log_id) parts.push(`恢复自 #${d.original_log_id}`)
     if (parts.length) return parts.join(' · ')
@@ -169,6 +175,30 @@ function parsedDetail(log) {
   }
 }
 
+function canUndo(log) {
+  return ['delete_recipe', 'delete_user', 'delete_oil'].includes(log.action)
+}
+
+async function undoAction(log) {
+  const ok = await showConfirm(`确定撤销此操作？将恢复「${log.target_name}」`)
+  if (!ok) return
+  try {
+    const res = await api(`/api/audit-log/${log.id}/undo`, { method: 'POST' })
+    if (res.ok) {
+      ui.showToast('已撤销')
+      logs.value = []
+      page.value = 0
+      hasMore.value = true
+      await fetchLogs()
+    } else {
+      const err = await res.json().catch(() => ({}))
+      ui.showToast('撤销失败: ' + (err.detail || err.message || ''))
+    }
+  } catch {
+    ui.showToast('撤销失败')
+  }
+}
+
 function formatTime(t) {
   if (!t) return ''
   return new Date(t + 'Z').toLocaleString('zh-CN', {
@@ -236,6 +266,11 @@ onMounted(() => fetchLogs())
 .log-detail { font-size: 13px; color: #6b6375; margin-top: 2px; }
 .log-target-name { font-weight: 500; color: #3e3a44; margin-right: 8px; }
 .log-extra { color: #999; font-size: 12px; }
+.undo-btn {
+  margin-left: 8px; padding: 2px 8px; border: 1px solid #d4cfc7; border-radius: 6px;
+  background: #fff; font-size: 11px; cursor: pointer; color: #6b6375; font-family: inherit;
+}
+.undo-btn:hover { border-color: #7ec6a4; color: #4a9d7e; }
 
 .load-more { text-align: center; margin-top: 16px; }
 .btn-outline {