fix: 新增配方去重+编辑者权限+共享去重统一

新增去重:
- 新增配方保存前检查公共库和个人配方同名
- 完全相同提示已有，内容不同显示差异可改名

编辑者权限:
- editor可编辑所有公共配方（前端+后端）
- editor不能编辑精油价目（已有）

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

frontend/src/stores/auth.js

@@ -73,10 +73,8 @@ export const useAuthStore = defineStore('auth', () => {
     user.value = { ...DEFAULT_USER }
   }
 
-  function canEditRecipe(recipe) {
-    if (isAdmin.value || user.value.role === 'senior_editor') return true
-    if (canEdit.value && recipe._owner_id === user.value.id) return true
-    return false
+  function canEditRecipe() {
+    return canEdit.value
   }
 
   return {

frontend/src/views/RecipeManager.vue

@@ -964,6 +964,38 @@ async function saveCurrentRecipe() {
     tags: formTags.value,
   }
 
+  // Dedup check for new recipes (not editing)
+  if (!editingRecipe.value) {
+    const name = formName.value.trim()
+    // Check public library
+    const pubDup = recipeStore.recipes.find(r => r.name === name)
+    // Check personal diary
+    const diaryDup = diaryStore.userDiary.find(d => d.name === name)
+    const dup = pubDup || diaryDup
+    if (dup) {
+      const dupIngs = (dup.ingredients || []).filter(i => i.oil).sort((a, b) => a.oil.localeCompare(b.oil))
+      const myIngs = cleanIngs.filter(i => i.oil).sort((a, b) => a.oil.localeCompare(b.oil))
+      const identical = dupIngs.length === myIngs.length && dupIngs.every((ing, i) => ing.oil === myIngs[i].oil && ing.drops === myIngs[i].drops)
+      const where = pubDup ? '公共配方库' : '我的配方'
+      if (identical) {
+        ui.showToast(`${where}中已有一模一样的配方「${name}」`)
+        return
+      }
+      // Show difference
+      const existIngs = dupIngs.map(i => `${i.oil}${i.drops}滴`).join('、')
+      const newIngs = myIngs.map(i => `${i.oil}${i.drops}滴`).join('、')
+      const ok = await showConfirm(
+        `${where}中已有同名配方「${name}」，内容不同：\n\n已有：${existIngs}\n新的：${newIngs}\n\n是否改名后保存？`,
+        { okText: '改名', cancelText: '取消' }
+      )
+      if (!ok) return
+      const newName = await showPrompt('请输入新名称：', name)
+      if (!newName || !newName.trim()) return
+      formName.value = newName.trim()
+      diaryPayload.name = newName.trim()
+    }
+  }
+
   if (editingRecipe.value && editingRecipe.value._diary_id) {
     // Editing an existing diary recipe
     try {