feat: 审核配方只通知管理员 + 指派高级编辑审核

- 去审核按钮仅管理员可见，其他用户显示已读
- 共享配方通知只发管理员
- 管理员待审核栏加"指派"按钮，选择高级编辑者审核
- 指派后发送通知给被指派人
- 新增 /api/recipes/{id}/assign-review 端点

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

frontend/src/components/UserMenu.vue

@@ -130,7 +130,7 @@ function isSearchMissing(n) {
 }
 
 function isReviewable(n) {
-  if (!n.title) return false
+  if (!auth.isAdmin || !n.title) return false
   return n.title.includes('待审核') || n.title.includes('商业认证') || n.title.includes('申请')
 }
 

frontend/src/views/RecipeManager.vue

@@ -11,6 +11,14 @@
         <span class="pending-owner">{{ r._owner_name }}</span>
         <button class="btn-sm btn-approve" @click="approveRecipe(r)">通过</button>
         <button class="btn-sm btn-reject" @click="rejectRecipe(r)">拒绝</button>
+        <button class="btn-sm btn-outline" @click="r._showAssign = !r._showAssign">指派</button>
+        <div v-if="r._showAssign" class="assign-row">
+          <select v-model="r._assignTo" class="assign-select">
+            <option value="">选择审核人...</option>
+            <option v-for="u in seniorEditors" :key="u.id" :value="u.id">{{ u.display_name || u.username }}</option>
+          </select>
+          <button class="btn-sm btn-primary" @click="assignReview(r)" :disabled="!r._assignTo">发送</button>
+        </div>
       </div>
     </div>
 
@@ -416,6 +424,7 @@ const editingRecipe = ref(null)
 const showPending = ref(false)
 const pendingRecipes = ref([])
 const pendingCount = ref(0)
+const seniorEditors = ref([])
 
 // Form state
 const formName = ref('')
@@ -1069,6 +1078,13 @@ onMounted(async () => {
       const res = await api('/api/recipe-reviews')
       if (res.ok) reviewHistory.value = await res.json()
     } catch {}
+    try {
+      const res = await api('/api/users')
+      if (res.ok) {
+        const users = await res.json()
+        seniorEditors.value = users.filter(u => u.role === 'senior_editor')
+      }
+    } catch {}
   }
   // Open recipe editor if redirected from card view
   const editId = localStorage.getItem('oil_edit_recipe_id')
@@ -1092,6 +1108,24 @@ function editDiaryRecipe(diary) {
   showAddOverlay.value = true
 }
 
+async function assignReview(recipe) {
+  const userId = recipe._assignTo
+  if (!userId) return
+  try {
+    const res = await api('/api/recipes/' + recipe._id + '/assign-review', {
+      method: 'POST',
+      body: JSON.stringify({ user_id: userId }),
+    })
+    if (res.ok) {
+      recipe._showAssign = false
+      recipe._assignTo = ''
+      ui.showToast('已指派审核')
+    }
+  } catch {
+    ui.showToast('指派失败')
+  }
+}
+
 function openRecipeDetail(recipe) {
   const idx = recipeStore.recipes.findIndex(r => r._id === recipe._id)
   if (idx >= 0) previewRecipeIndex.value = idx
@@ -1700,6 +1734,9 @@ watch(() => recipeStore.recipes, () => {
   padding: 0; margin-right: 4px; line-height: 1;
 }
 .mini-select.active { background: #4a9d7e; border-color: #4a9d7e; color: #fff; }
+.assign-row { display: flex; gap: 6px; align-items: center; margin-top: 4px; }
+.assign-select { padding: 4px 8px; border: 1px solid #d4cfc7; border-radius: 6px; font-size: 12px; font-family: inherit; }
+.btn-primary { background: linear-gradient(135deg, #7ec6a4, #4a9d7e); color: #fff; border: none; border-radius: 8px; cursor: pointer; font-family: inherit; }
 .tag-list-bar {
   display: flex; flex-wrap: wrap; gap: 6px; margin-bottom: 10px; padding: 8px 0;
 }