feat: 英文搜索+全部配方翻译

- 搜索框支持英文：自动匹配配方英文名和精油英文名
- 292条配方全部翻译英文名（本地+线上同步）
- 输入英文时搜索范围包含en_name和精油英文名

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

frontend/src/views/RecipeSearch.vue

@@ -175,6 +175,7 @@ import { useUiStore } from '../stores/ui'
 import { api } from '../composables/useApi'
 import RecipeCard from '../components/RecipeCard.vue'
 import RecipeDetailOverlay from '../components/RecipeDetailOverlay.vue'
+import { oilEn } from '../composables/useOilTranslation'
 
 const auth = useAuthStore()
 const oils = useOilsStore()
@@ -313,11 +314,14 @@ function expandQuery(q) {
 const exactResults = computed(() => {
   if (!searchQuery.value.trim()) return []
   const q = searchQuery.value.trim().toLowerCase()
+  const isEn = /^[a-zA-Z\s]+$/.test(q)
   return recipeStore.recipes.filter(r => {
     const nameMatch = r.name.toLowerCase().includes(q)
+    const enNameMatch = isEn && (r.en_name || '').toLowerCase().includes(q)
+    const oilEnMatch = isEn && r.ingredients.some(ing => (oilEn(ing.oil) || '').toLowerCase().includes(q))
     const visibleTags = auth.canEdit ? (r.tags || []) : (r.tags || []).filter(t => !EDITOR_ONLY_TAGS.includes(t))
     const tagMatch = visibleTags.some(t => t.toLowerCase().includes(q))
-    return nameMatch || tagMatch
+    return nameMatch || enNameMatch || oilEnMatch || tagMatch
   }).sort((a, b) => a.name.localeCompare(b.name, 'zh'))
 })