Refactor frontend to Vue 3 + Vite + Pinia + Cypress E2E

- Replace single-file 8441-line HTML with Vue 3 SPA
- Pinia stores: auth, oils, recipes, diary, ui
- Composables: useApi, useDialog, useSmartPaste, useOilTranslation
- 6 shared components: RecipeCard, RecipeDetailOverlay, TagPicker, etc.
- 9 page views: RecipeSearch, RecipeManager, Inventory, OilReference, etc.
- 14 Cypress E2E test specs (113 tests), all passing
- Multi-stage Dockerfile (Node build + Python runtime)
- Demo video generation scripts (TTS + subtitles + screen recording)

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

frontend/src/composables/useOilTranslation.js

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+// Oil English names map
+const OIL_EN = {
+  '薰衣草': 'Lavender', '茶树': 'Tea Tree', '乳香': 'Frankincense',
+  '柠檬': 'Lemon', '椒样薄荷': 'Peppermint', '丝柏': 'Cypress',
+  '尤加利': 'Eucalyptus', '迷迭香': 'Rosemary', '天竺葵': 'Geranium',
+  '依兰依兰': 'Ylang Ylang', '佛手柑': 'Bergamot', '生姜': 'Ginger',
+  '没药': 'Myrrh', '檀香': 'Sandalwood', '雪松': 'Cedarwood',
+  '罗马洋甘菊': 'Roman Chamomile', '永久花': 'Helichrysum',
+  '快乐鼠尾草': 'Clary Sage', '广藿香': 'Patchouli',
+  '百里香': 'Thyme', '牛至': 'Oregano', '冬青': 'Wintergreen',
+  '肉桂': 'Cinnamon', '丁香': 'Clove', '黑胡椒': 'Black Pepper',
+  '葡萄柚': 'Grapefruit', '橙花': 'Neroli', '玫瑰': 'Rose',
+  '岩兰草': 'Vetiver', '马郁兰': 'Marjoram', '芫荽': 'Coriander',
+  '柠檬草': 'Lemongrass', '杜松浆果': 'Juniper Berry', '甜橙': 'Wild Orange',
+  '香茅': 'Citronella', '薄荷': 'Peppermint', '扁柏': 'Arborvitae',
+  '古巴香脂': 'Copaiba', '椰子油': 'Coconut Oil',
+  '芳香调理': 'AromaTouch', '保卫复方': 'On Guard',
+  '乐活复方': 'Balance', '舒缓复方': 'Past Tense',
+  '净化复方': 'Purify', '呼吸复方': 'Breathe',
+  '舒压复方': 'Adaptiv', '多特瑞': 'doTERRA',
+}
+
+export function oilEn(name) {
+  return OIL_EN[name] || ''
+}
+
+export function recipeNameEn(name) {
+  // Try to translate known keywords
+  // Simple approach: return original name for now, user can customize
+  return name
+}
+
+// Custom translations (can be set by admin)
+const customTranslations = {}
+
+export function setCustomTranslation(zhName, enName) {
+  customTranslations[zhName] = enName
+}
+
+export function getCustomTranslation(zhName) {
+  return customTranslations[zhName]
+}