feat: 完成P6-P8前端能力闭环（V3,D2,D3,B3）

client/src/api/exports.ts

@@ -41,5 +41,19 @@ export async function exportAuditLogs(params: {
   return apiRequestBlob(`/api/exports/audit-logs?${qs.toString()}`);
 }
 
-export type { ApiBlobResponse };
+export async function exportDashboardReimbursements(params: {
+  format: "csv" | "xlsx";
+  dateFrom?: string;
+  dateTo?: string;
+  departmentId?: string;
+}) {
+  const qs = new URLSearchParams();
+  qs.set("format", params.format);
+  if (params.dateFrom) qs.set("dateFrom", params.dateFrom);
+  if (params.dateTo) qs.set("dateTo", params.dateTo);
+  if (params.departmentId) qs.set("departmentId", params.departmentId);
 
+  return apiRequestBlob(`/api/exports/dashboard/reimbursements?${qs.toString()}`);
+}
+
+export type { ApiBlobResponse };