fix: 优化报销制单下载与付款进度（09-08-reimbursement-payment-closeout）

server/src/routes/paymentBatches.js

@@ -87,6 +87,8 @@ const REASON_SCHEMA = z.object({
   reason: z.string().trim().min(2).max(500),
 }).strict();
 
+const PAYMENT_ORDER_SCHEMA = REASON_SCHEMA.partial();
+
 const RECEIPT_FILE_QUERY_SCHEMA = z.object({
   mode: z.enum(["download", "preview"]).default("download"),
   reason: z.string().max(500).optional(),
@@ -1642,7 +1644,12 @@ async function paymentBatchesRoutes(fastify) {
       await ensureFeatureEnabled(fastify);
       ensurePaymentOrderExportPermission(fastify, request);
       const batchId = parseId(request.params?.id);
-      const { reason } = parseBody(REASON_SCHEMA, request.body);
+      const { reason } = parseBody(PAYMENT_ORDER_SCHEMA, request.body ?? {});
+      const downloadContext = {
+        purpose: "reimbursement_bank_transfer",
+        purposeSource: "system",
+        ...(reason === undefined ? {} : { reason }),
+      };
 
       let result;
       try {
@@ -1675,7 +1682,7 @@ async function paymentBatchesRoutes(fastify) {
                 batchNo: batch.batch_no,
                 rowCount: generated.rowCount,
                 totalAmount: generated.totalAmount,
-                reason,
+                ...downloadContext,
                 exportCount,
               },
             }),
@@ -1698,7 +1705,7 @@ async function paymentBatchesRoutes(fastify) {
             action: "PAYMENT_ORDER_EXPORT_BLOCKED",
             targetType: "payment_batch",
             targetId: batchId,
-            extra: { reason, resultCode },
+            extra: { ...downloadContext, resultCode },
           }),
         }).catch((auditError) => {
           fastify.log.error({ err: auditError, requestId: request.id }, "payment order block audit failed");
@@ -1716,7 +1723,7 @@ async function paymentBatchesRoutes(fastify) {
 
       const safeBatchNo = String(result.batchNo).replace(/[^A-Za-z0-9-]/g, "_");
       reply.header("content-type", "application/vnd.ms-excel");
-      reply.header("content-disposition", `attachment; filename="payment-order-${safeBatchNo}.xls"`);
+      reply.header("content-disposition", buildAttachmentContentDisposition(`报销制单_${safeBatchNo}.xls`));
       reply.header("cache-control", "no-store");
       reply.header("x-content-type-options", "nosniff");
       return reply.send(result.buffer);