修复铁路OCR空金额回退（07-28-travel-reimbursement-guide）

server/src/services/ocr/tencent.js

@@ -222,7 +222,7 @@ function normalizeFullVatInvoiceInfo(info, documentSubtype) {
 
 function normalizeElectronicTrainTicket(info) {
   const taxAmount = toNumberString(info?.Tax);
-  const totalAmount = toNumberString(info?.Total ?? info?.Fare);
+  const totalAmount = toNumberString(info?.Total) ?? toNumberString(info?.Fare);
 
   return {
     ...buildBaseNormalizedResult({