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.test.ts

@@ -110,7 +110,18 @@ describe('flattenProtocolAuditRows', () => {
         infectiousDiseaseReportUrls: '',
         attachmentUrls: 'https://x/b.pdf',
         remark: '备注一',
-        sampleItems: [{ sampleTypeName: 'NK', sampleCode: 'D2', labStorageCode: 'A1' }]
+        sampleItems: [
+          {
+            sampleTypeName: 'NK',
+            sampleCode: 'D2',
+            labStorageCode: 'A1',
+            freight: {
+              id: 'fr-1',
+              transportModeLabel: '专线车',
+              freightAmountLabel: '100'
+            }
+          }
+        ]
       }
     ])
     assert.equal(rows[0].monthlyVerifyNo, '202508001')
@@ -122,6 +133,9 @@ describe('flattenProtocolAuditRows', () => {
     assert.equal(rows[0].infectiousDiseaseReportUrls, '')
     assert.equal(rows[0].attachmentUrls, 'https://x/b.pdf')
     assert.equal(rows[0].remark, '备注一')
+    assert.equal(rows[0].freightId, 'fr-1')
+    assert.equal(rows[0].freightTransportLabel, '专线车')
+    assert.equal(rows[0].freightAmountLabel, '100')
   })
 })