feat: 用户软删除+30天自动清理，操作日志共享配方统一显示

用户删除改为软删除(deleted标记)，撤销时数据完整恢复（配方/收藏/库存等）。
30天后自动硬删除清理。操作日志中共享配方和采纳配方统一显示为"共享配方"。

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

frontend/src/views/AuditLog.vue

@@ -82,10 +82,10 @@ const selectedUser = ref('')
 const selectedTarget = ref('')
 
 const ACTION_MAP = {
-  create_recipe: '新增配方',
+  share_recipe: '共享配方',
+  adopt_recipe: '共享配方',
   update_recipe: '编辑配方',
   delete_recipe: '删除配方',
-  adopt_recipe: '采纳配方',
   reject_recipe: '拒绝配方',
   undo_delete_recipe: '恢复配方',
   upsert_oil: '编辑精油',
@@ -105,8 +105,8 @@ const ACTION_MAP = {
 }
 
 const actionGroups = {
-  '配方': ['create_recipe', 'update_recipe', 'delete_recipe', 'undo_delete_recipe'],
-  '审核': ['adopt_recipe', 'reject_recipe'],
+  '配方': ['share_recipe', 'adopt_recipe', 'update_recipe', 'delete_recipe', 'undo_delete_recipe'],
+  '审核': ['reject_recipe'],
   '精油': ['upsert_oil', 'delete_oil', 'undo_delete_oil'],
   '标签': ['create_tag', 'delete_tag'],
   '用户': ['create_user', 'update_user', 'delete_user', 'undo_delete_user', 'register'],
@@ -153,7 +153,7 @@ function actionColorClass(action) {
   if (action.includes('create') || action.includes('upsert')) return 'color-create'
   if (action.includes('update')) return 'color-update'
   if (action.includes('delete') || action.includes('reject')) return 'color-delete'
-  if (action.includes('adopt') || action.includes('undo')) return 'color-approve'
+  if (action.includes('adopt') || action.includes('undo') || action.includes('share')) return 'color-approve'
   return ''
 }
 
@@ -179,7 +179,13 @@ function parsedDetail(log) {
 }
 
 function canUndo(log) {
-  return ['delete_recipe', 'delete_user', 'delete_oil'].includes(log.action)
+  if (!['delete_recipe', 'delete_user', 'delete_oil'].includes(log.action)) return false
+  if (log.action === 'delete_user' && log.created_at) {
+    const deleted = new Date(log.created_at + 'Z')
+    const days = (Date.now() - deleted.getTime()) / (1000 * 60 * 60 * 24)
+    if (days > 30) return false
+  }
+  return true
 }
 
 async function undoAction(log) {