feat: 完成 F17 报表导出（CSV/XLSX）\n\n- 后端新增 /api/exports/* 导出接口（含权限与审计记录）\n- CSV 采用流式生成，XLSX 使用 exceljs\n- 前端在报销/票据/审计页加入导出入口（下载 Blob）\n- 更新 P5 蓝图 v3 中 F17 状态为 DONE

client/src/api/exports.ts

@@ -0,0 +1,45 @@
+import { apiRequestBlob, type ApiBlobResponse } from "./http";
+
+export async function exportReimbursements(params: {
+  format: "csv" | "xlsx";
+  status?: string;
+  scope?: "own" | "all";
+}) {
+  const qs = new URLSearchParams();
+  qs.set("format", params.format);
+  if (params.status) qs.set("status", params.status);
+  if (params.scope) qs.set("scope", params.scope);
+
+  return apiRequestBlob(`/api/exports/reimbursements?${qs.toString()}`);
+}
+
+export async function exportInvoicePool(params: {
+  format: "csv" | "xlsx";
+  status?: string;
+  ownerScope?: "own" | "all";
+}) {
+  const qs = new URLSearchParams();
+  qs.set("format", params.format);
+  if (params.status) qs.set("status", params.status);
+  if (params.ownerScope) qs.set("ownerScope", params.ownerScope);
+
+  return apiRequestBlob(`/api/exports/invoice-pool?${qs.toString()}`);
+}
+
+export async function exportAuditLogs(params: {
+  format: "csv" | "xlsx";
+  action?: string;
+  targetType?: string;
+  actorId?: string;
+}) {
+  const qs = new URLSearchParams();
+  qs.set("format", params.format);
+  if (params.action) qs.set("action", params.action);
+  if (params.targetType) qs.set("targetType", params.targetType);
+  if (params.actorId) qs.set("actorId", params.actorId);
+
+  return apiRequestBlob(`/api/exports/audit-logs?${qs.toString()}`);
+}
+
+export type { ApiBlobResponse };
+