feat: 配方显示容量和可做次数；套装成本不超过单买价（配件视为赠品）

- 每个配方名后显示容量（单次/5ml/10ml等）
- 新增可做次数列（按最先用完的精油计算）
- 套装成本分摊使用 min(套装价, 油瓶总价)，避免含配件的套装算出比单买贵

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

frontend/src/composables/useKitCost.js

@@ -35,12 +35,14 @@ export function useKitCost() {
     }
     if (totalBottlePrice === 0) return {}
 
-    // Proportional allocation
+    // Proportional allocation — kit accessories treated as freebies,
+    // so oil cost = min(kit price, sum of bottle prices)
+    const effectivePrice = Math.min(kit.price, totalBottlePrice)
     const perDrop = {}
     for (const name of resolved) {
       const meta = oils.oilsMeta[name]
       const bp = oilBottlePrices[name]
-      const kitCostForOil = (bp / totalBottlePrice) * kit.price
+      const kitCostForOil = (bp / totalBottlePrice) * effectivePrice
       const drops = meta ? meta.dropCount : 1
       perDrop[name] = drops > 0 ? kitCostForOil / drops : 0
     }
@@ -124,6 +126,7 @@ export function useKitCost() {
         id,
         name: recipe.name,
         tags: recipe.tags,
+        volume: recipe.volume,
         ingredients: recipe.ingredients,
         originalCost: recipe.originalCost,
         costs,

frontend/src/views/KitExport.vue

@@ -39,6 +39,7 @@
         <thead>
           <tr>
             <th class="th-name">配方名</th>
+            <th class="th-times">可做次数</th>
             <th class="th-cost">套装成本</th>
             <th class="th-cost">原价成本</th>
             <th class="th-price">售价</th>
@@ -47,7 +48,8 @@
         </thead>
         <tbody>
           <tr v-for="r in activeKitData.recipes" :key="r._id">
-            <td class="td-name">{{ r.name }}</td>
+            <td class="td-name">{{ r.name }} <span class="td-volume">{{ r.volume || '单次' }}</span></td>
+            <td class="td-times">{{ calcMaxTimes(r) }}</td>
             <td class="td-cost">{{ fmtPrice(r.kitCost) }}</td>
             <td class="td-cost original">{{ fmtPrice(r.originalCost) }}</td>
             <td class="td-price">
@@ -83,7 +85,7 @@
           </thead>
           <tbody>
             <tr v-for="row in crossComparison" :key="row.id">
-              <td class="td-name">{{ row.name }}</td>
+              <td class="td-name">{{ row.name }} <span class="td-volume">{{ row.volume || '单次' }}</span></td>
               <td v-for="ka in kitAnalysis" :key="ka.id" :class="row.costs[ka.id] != null ? 'td-kit-available' : 'td-kit-na'">
                 <template v-if="row.costs[ka.id] != null">{{ fmtPrice(row.costs[ka.id]) }}</template>
                 <template v-else><span class="na">—</span></template>
@@ -142,6 +144,20 @@ function saveSellingPrices() {
   localStorage.setItem(STORAGE_KEY, JSON.stringify(sellingPrices.value))
 }
 
+// Calculate how many times a recipe can be made with the kit (limited by the oil that runs out first)
+function calcMaxTimes(recipe) {
+  const ings = (recipe.ingredients || []).filter(i => i.oil && i.oil !== '椰子油' && i.drops > 0)
+  if (!ings.length) return '—'
+  let minTimes = Infinity
+  for (const ing of ings) {
+    const meta = oils.oilsMeta[ing.oil]
+    if (!meta || !meta.dropCount) return '—'
+    const times = Math.floor(meta.dropCount / ing.drops)
+    if (times < minTimes) minTimes = times
+  }
+  return minTimes === Infinity ? '—' : minTimes + '次'
+}
+
 function getSellingPrice(recipeId) {
   return sellingPrices.value[recipeId] ?? 0
 }
@@ -394,6 +410,8 @@ async function exportExcel(mode) {
 .td-cost.original { color: #999; font-weight: 400; }
 .td-profit { font-weight: 600; color: #4a9d7e; }
 .td-profit.negative { color: #ef5350; }
+.td-volume { font-size: 10px; color: #b0aab5; margin-left: 4px; }
+.td-times { color: #6b6375; font-size: 12px; }
 .td-kit-available { font-weight: 500; color: #4a9d7e; background: #f0faf5; }
 .td-kit-na { background: #fafafa; }
 .na { color: #ddd; }