fix: 导出PDF修复 — volumeLabel缺name参数，单价列适配单位

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

frontend/src/views/OilReference.vue

@@ -843,8 +843,9 @@ function exportPDF() {
     const en = getEnglishName(name)
     const bp = meta.bottlePrice != null ? '¥' + meta.bottlePrice.toFixed(0) : '--'
     const rp = meta.retailPrice != null ? '¥' + meta.retailPrice.toFixed(0) : '--'
-    const vol = volumeLabel(meta.dropCount)
-    const ppd = oils.pricePerDrop(name) ? '¥' + oils.pricePerDrop(name).toFixed(2) : '--'
+    const vol = volumeLabel(meta.dropCount, name)
+    const unit = oilPriceUnit(name)
+    const ppd = oils.pricePerDrop(name) ? '¥' + oils.pricePerDrop(name).toFixed(2) + '/' + unit : '--'
     rows += `<tr>
       <td>${name}</td>
       <td>${en}</td>
@@ -876,7 +877,7 @@ function exportPDF() {
 <h1>doTERRA 精油价目表 ${dateStr}</h1>
 <table>
   <thead>
-    <tr><th>精油</th><th>英文名</th><th>会员价</th><th>零售价</th><th>容量</th><th>单价/滴</th></tr>
+    <tr><th>精油</th><th>英文名</th><th>会员价</th><th>零售价</th><th>容量</th><th>单价</th></tr>
   </thead>
   <tbody>${rows}</tbody>
 </table>