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/components/RecipeDetailOverlay.vue

@@ -66,7 +66,7 @@
                 <span class="ec-oil-name">{{ getCardOilName(ing.oil) }}</span>
                 <span class="ec-drops">{{ ing.drops }} {{ oilsStore.unitLabelPlural(ing.oil, ing.drops, cardLang) }}</span>
                 <span class="ec-cost">{{ oilsStore.fmtPrice(oilsStore.pricePerDrop(ing.oil) * ing.drops) }}</span>
-                <span v-if="cardHasAnyRetail" class="ec-retail">{{ hasRetailForOil(ing.oil) && retailPerDrop(ing.oil) > oilsStore.pricePerDrop(ing.oil) ? oilsStore.fmtPrice(retailPerDrop(ing.oil) * ing.drops) : '' }}</span>
+                <span v-if="cardHasAnyRetail" class="ec-retail">{{ hasRetailForOil(ing.oil) ? oilsStore.fmtPrice(retailPerDrop(ing.oil) * ing.drops) : '' }}</span>
               </li>
             </ul>
 
@@ -591,7 +591,7 @@ function getCardRecipeName() {
 }
 
 const cardHasAnyRetail = computed(() =>
-  cardIngredients.value.some(ing => hasRetailForOil(ing.oil) && retailPerDrop(ing.oil) > oilsStore.pricePerDrop(ing.oil))
+  cardIngredients.value.some(ing => hasRetailForOil(ing.oil))
 )
 
 const cardTitleSize = computed(() => {
@@ -1699,8 +1699,8 @@ async function saveRecipe() {
 }
 
 .editor-drops {
-  width: 42px;
-  padding: 5px 2px;
+  width: 58px;
+  padding: 5px 4px 5px 6px;
   border: 1.5px solid var(--border, #e0d4c0);
   border-radius: 8px;
   font-size: 13px;