feat(admin-listing): 商品管理列表在租金/押金左侧展示号主纯币价格

- listingDisplay 新增 getListingSellerCoinPrice，读取价格快照 seller_coin_base_price
  （号主收号价中的纯币部分，不含额外消耗品）
- 商品管理表格新增「纯币价格」列并置于「租金/押金」左侧，悬停显示完整说明
- 快照缺失（旧数据/无定价快照）时展示 -，与相邻列风格一致
- PNG 导出列定义同步新增该列，保持导出与页面一致
- 补 listingDisplay 单测：纯币价读取、消耗品单独计价时与号主总价区分、缺快照兜底

frontend/src/features/admin/views/AdminListingsView.vue

@@ -22,6 +22,7 @@ import {
   formatRatio,
   getCoinWan,
   getDailyLoss,
+  getListingSellerCoinPrice,
   getResourceQuantity,
   getSkinGroup,
 } from '@/shared/utils/listingDisplay'
@@ -135,6 +136,7 @@ const screenshotColumns = [
     read: (row: Listing) => characterAndWeaponSkinText(row),
   },
   { label: '号主备注', width: 160, read: (row: Listing) => ownerRemarkText(row) },
+  { label: '纯币价格', width: 90, read: (row: Listing) => ownerPureCoinPriceText(row) },
   { label: '租金/押金', width: 96, read: (row: Listing) => rentAndDepositText(row) },
   { label: '比例', width: 64, read: (row: Listing) => formatRatio(row) },
   {
@@ -599,6 +601,13 @@ function rentAndDepositText(row: Listing) {
   return `${listingPrice(row)}/${formatCentWithSymbol(row.deposit_amount_cent)}`
 }
 
+// 号主纯币价格：号主收号价里的纯币部分（不含额外消耗品），取自发布时固化的价格快照。
+function ownerPureCoinPriceText(row: Listing) {
+  const price = getListingSellerCoinPrice(row)
+  if (price <= 0) return '-'
+  return formatCentWithSymbol(Math.round(price * 100))
+}
+
 function estimateTitle(row: Listing) {
   const dailyLoss = getDailyLoss(row)
   return dailyLoss ? `按哈夫币 ${listingCoinM(row)}、日耗 ${dailyLoss} 估算` : '未配置日耗'
@@ -965,6 +974,14 @@ function formatQuantity(value: number) {
       <el-table-column label="号主备注" min-width="150">
         <template #default="{ row }">{{ ownerRemarkText(row) }}</template>
       </el-table-column>
+      <el-table-column label="纯币价格" width="90">
+        <template #default="{ row }">
+          <span :title="`号主纯币价格（不含消耗品）${ownerPureCoinPriceText(row)}`">
+            {{ ownerPureCoinPriceText(row) }}
+          </span>
+        </template>
+      </el-table-column>
+
       <el-table-column label="租金/押金" width="90">
         <template #default="{ row }">{{ rentAndDepositText(row) }}</template>
       </el-table-column>