fix(web-admin): 科研捐赠导出补齐运费并按批次合并单元格

列表未返回样本运费批次导致运费列为空。导出按同一运费批次合并运输方式与运费列，并按模板对齐储存状态等字段。

Co-authored-by: Cursor <cursoragent@cursor.com>

web-admin/src/utils/protocol-audit-flatten.ts

@@ -37,6 +37,10 @@ export type ProtocolAuditFlatRow = {
   labStorageCode: string
   transportType: string
   transportLabel: string
+  /** 样本运费批次；多样本共用时 id 相同 */
+  freightId: string
+  freightTransportLabel: string
+  freightAmountLabel: string
   paymentSummary: QcProtocolPaymentSummary | null
   monthlyVerifyNo: string
   donationStatus: string
@@ -90,7 +94,13 @@ export function flattenProtocolAuditRows(
     slots.forEach((item, sampleIndex) => {
       const rec = item || {}
       const transport = asRecord(rec.transport)
+      const freight = asRecord(rec.freight)
       const transportType = str(transport?.transportType)
+      const freightAmountLabel = str(freight?.freightAmountLabel)
+      const freightAmount =
+        freight?.freightAmount == null || freight?.freightAmount === ''
+          ? ''
+          : String(freight.freightAmount)
       out.push({
         rowKey: `${protocolId}|${str(rec.sampleCode) || sampleIndex}`,
         protocolId,
@@ -113,6 +123,9 @@ export function flattenProtocolAuditRows(
         labStorageCode: str(rec.labStorageCode),
         transportType,
         transportLabel: '',
+        freightId: str(freight?.id),
+        freightTransportLabel: str(freight?.transportModeLabel) || str(freight?.transportMode),
+        freightAmountLabel: freightAmountLabel || freightAmount,
         paymentSummary:
           protocol.paymentSummary && typeof protocol.paymentSummary === 'object'
             ? (protocol.paymentSummary as QcProtocolPaymentSummary)