fix: 多项修复 — 滴数框/零售价显示/精油英文名保存/再次审核通知

1. 编辑配方的滴数输入框从 42px 加宽到 58px，确保 50.5 不被 spinner 遮挡
2. 配方卡片在零售价==会员价时也显示零售价（之前因 retail>cost 过滤掉）
3. 精油价目英文名保存后被静态 OIL_CARDS 覆盖，把 getEnglishName 的优先级改
   为先用 DB meta.enName，解决温柔呵护/仕女呵护等显示不更新的问题
4. 再次审核 tag 的配方被非管理员修改时，给管理员发通知，内容含前后 diff
5. 对应 vitest + cypress 测试各一组

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

frontend/src/__tests__/multiFixIssues.test.js

@@ -0,0 +1,87 @@
+import { describe, it, expect } from 'vitest'
+
+// Replicates the fixed fmtCostWithRetail logic: retail shown whenever any ingredient
+// has a retail price stored (even when it equals the member price).
+function fmtCostWithRetail(ingredients, oilsMeta) {
+  const cost = ingredients.reduce((s, i) => {
+    const m = oilsMeta[i.oil]
+    return s + (m ? (m.bottlePrice / m.dropCount) * i.drops : 0)
+  }, 0)
+  const retail = ingredients.reduce((s, i) => {
+    const m = oilsMeta[i.oil]
+    if (m && m.retailPrice && m.dropCount) return s + (m.retailPrice / m.dropCount) * i.drops
+    return s + (m ? (m.bottlePrice / m.dropCount) * i.drops : 0)
+  }, 0)
+  const anyRetail = ingredients.some(i => {
+    const m = oilsMeta[i.oil]
+    return m && m.retailPrice && m.dropCount
+  })
+  if (anyRetail && retail > 0) {
+    return { cost: '¥ ' + cost.toFixed(2), retail: '¥ ' + retail.toFixed(2), hasRetail: true }
+  }
+  return { cost: '¥ ' + cost.toFixed(2), retail: null, hasRetail: false }
+}
+
+describe('fmtCostWithRetail — retail price display', () => {
+  it('shows retail when retail > member', () => {
+    const meta = { '玫瑰': { bottlePrice: 100, retailPrice: 150, dropCount: 10 } }
+    const r = fmtCostWithRetail([{ oil: '玫瑰', drops: 5 }], meta)
+    expect(r.hasRetail).toBe(true)
+    expect(r.retail).toBe('¥ 75.00')
+  })
+
+  it('still shows retail when retail === member (regression: 带玫瑰护手霜 case)', () => {
+    const meta = { '玫瑰护手霜': { bottlePrice: 300, retailPrice: 300, dropCount: 50 } }
+    const r = fmtCostWithRetail([{ oil: '玫瑰护手霜', drops: 5 }], meta)
+    expect(r.hasRetail).toBe(true)
+    expect(r.cost).toBe('¥ 30.00')
+    expect(r.retail).toBe('¥ 30.00')
+  })
+
+  it('no retail when ingredient has no retail price', () => {
+    const meta = { '薰衣草': { bottlePrice: 100, retailPrice: null, dropCount: 10 } }
+    const r = fmtCostWithRetail([{ oil: '薰衣草', drops: 5 }], meta)
+    expect(r.hasRetail).toBe(false)
+    expect(r.retail).toBeNull()
+  })
+})
+
+// getEnglishName priority fix — DB en_name must beat static card override.
+function getEnglishName(name, oilsMeta, cards, aliases, oilEnFn) {
+  const meta = oilsMeta[name]
+  if (meta?.enName) return meta.enName
+  if (cards[name]?.en) return cards[name].en
+  if (aliases[name] && cards[aliases[name]]?.en) return cards[aliases[name]].en
+  const base = name.replace(/呵护$/, '')
+  if (base !== name && cards[base]?.en) return cards[base].en
+  return oilEnFn ? oilEnFn(name) : ''
+}
+
+describe('getEnglishName — DB wins over static card', () => {
+  const cards = {
+    '温柔呵护': { en: 'Soft Talk' },
+    '椒样薄荷': { en: 'Peppermint' },
+    '西班牙牛至': { en: 'Oregano' },
+  }
+  const aliases = { '仕女呵护': '温柔呵护', '薄荷呵护': '椒样薄荷', '牛至呵护': '西班牙牛至' }
+
+  it('uses DB en_name over static card en (温柔呵护 regression)', () => {
+    const meta = { '温柔呵护': { enName: 'Clary Calm' } }
+    expect(getEnglishName('温柔呵护', meta, cards, aliases)).toBe('Clary Calm')
+  })
+
+  it('uses DB en_name over aliased card en (仕女呵护 regression)', () => {
+    const meta = { '仕女呵护': { enName: 'Soft Talk Touch' } }
+    expect(getEnglishName('仕女呵护', meta, cards, aliases)).toBe('Soft Talk Touch')
+  })
+
+  it('falls back to static card when DB en_name is empty', () => {
+    const meta = { '温柔呵护': { enName: '' } }
+    expect(getEnglishName('温柔呵护', meta, cards, aliases)).toBe('Soft Talk')
+  })
+
+  it('alias still works as fallback', () => {
+    const meta = { '牛至呵护': {} }
+    expect(getEnglishName('牛至呵护', meta, cards, aliases)).toBe('Oregano')
+  })
+})