实现报销材料合并预览与差旅概要（07-27-yang-jun-reimbursement-readiness）

server/tests/unit/routes/reimbursements.detail.test.js

@@ -238,6 +238,13 @@ describe("GET /api/reimbursements/:id detail enhancements", () => {
       },
       createdAt: "2026-04-10T09:00:00.000Z",
       submittedAt: "2026-04-10T10:00:00.000Z",
+      travelSummary: {
+        isTravel: true,
+        purpose: "客户拜访报销",
+        location: null,
+        startDate: "2026-04-09",
+        endDate: "2026-04-09",
+      },
       invoices: [
         {
           id: "invoice-1",