fix: 保存配方卡片所有英文翻译（含精油名称）

之前保存翻译时只保存了配方名的 en_name，精油的自定义英文名
（customOilNameEn）没有持久化，刷新后丢失。

- backend: recipes 表新增 en_oils（JSON 字符串）列
- RecipeUpdate 模型增加 en_oils 字段，update_recipe 写入 DB
- 所有 SELECT 语句补上 en_oils，_recipe_to_dict 返回该字段
- frontend: applyTranslation() 同时提交 en_oils
- onMounted 优先从 r.en_oils 还原精油译名，再 fallback 静态表
- recipes store 映射 en_oils 字段

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

frontend/src/components/RecipeDetailOverlay.vue

@@ -576,11 +576,12 @@ function copyText() {
 
 async function applyTranslation() {
   showTranslationEditor.value = false
-  // Persist en_name to backend
-  if (recipe.value._id && customRecipeNameEn.value) {
+  // Persist en_name and en_oils to backend
+  if (recipe.value._id) {
     try {
       await api.put(`/api/recipes/${recipe.value._id}`, {
         en_name: customRecipeNameEn.value,
+        en_oils: JSON.stringify(customOilNameEn.value),
         version: recipe.value._version,
       })
       ui.showToast('翻译已保存')
@@ -708,9 +709,10 @@ onMounted(() => {
   editIngredients.value = (r.ingredients || []).map(i => ({ oil: i.oil, drops: i.drops }))
   // Init translation defaults
   customRecipeNameEn.value = r.en_name || recipeNameEn(r.name)
+  const savedOilMap = r.en_oils ? (() => { try { return JSON.parse(r.en_oils) } catch { return {} } })() : {}
   const enMap = {}
   ;(r.ingredients || []).forEach(ing => {
-    enMap[ing.oil] = oilEn(ing.oil) || ing.oil
+    enMap[ing.oil] = savedOilMap[ing.oil] || oilEn(ing.oil) || ing.oil
   })
   customOilNameEn.value = enMap
 

frontend/src/stores/recipes.js

@@ -17,6 +17,7 @@ export const useRecipesStore = defineStore('recipes', () => {
       _version: r._version ?? r.version ?? 1,
       name: r.name,
       en_name: r.en_name ?? '',
+      en_oils: r.en_oils ?? '{}',
       note: r.note ?? '',
       tags: r.tags ?? [],
       ingredients: (r.ingredients ?? []).map((ing) => ({