Persist recipe English name translation to database

- Add en_name column to recipes table (migration in database.py)
- Include en_name in recipe API responses and RecipeUpdate model
- Save en_name when admin/senior_editor applies translation
- Load en_name on overlay open, so translation persists across sessions

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

frontend/src/components/RecipeDetailOverlay.vue

@@ -518,9 +518,20 @@ function copyText() {
   })
 }
 
-function applyTranslation() {
-  // translations stored in customOilNameEn / customRecipeNameEn
+async function applyTranslation() {
   showTranslationEditor.value = false
+  // Persist en_name to backend
+  if (recipe.value._id && customRecipeNameEn.value) {
+    try {
+      await api.put(`/api/recipes/${recipe.value._id}`, {
+        en_name: customRecipeNameEn.value,
+        version: recipe.value._version,
+      })
+      ui.showToast('翻译已保存')
+    } catch (e) {
+      ui.showToast('翻译保存失败')
+    }
+  }
   cardImageUrl.value = null
   nextTick(() => generateCardImage())
 }
@@ -535,7 +546,7 @@ function getCardOilName(name) {
 
 function getCardRecipeName() {
   if (cardLang.value === 'en') {
-    return customRecipeNameEn.value || recipeNameEn(recipe.value.name)
+    return customRecipeNameEn.value || recipe.value.en_name || recipeNameEn(recipe.value.name)
   }
   return recipe.value.name
 }
@@ -640,7 +651,7 @@ onMounted(() => {
   editTags.value = [...(r.tags || [])]
   editIngredients.value = (r.ingredients || []).map(i => ({ oil: i.oil, drops: i.drops }))
   // Init translation defaults
-  customRecipeNameEn.value = recipeNameEn(r.name)
+  customRecipeNameEn.value = r.en_name || recipeNameEn(r.name)
   const enMap = {}
   ;(r.ingredients || []).forEach(ing => {
     enMap[ing.oil] = oilEn(ing.oil) || ing.oil