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/pages/InvoicePoolPage.tsx

@@ -3,6 +3,7 @@ import { useMutation, useQuery, useQueryClient } from "@tanstack/react-query";
 import { isApiError } from "../api/types";
 import { mapApiErrorMessage } from "../api/errorMessages";
 import { fetchMyDelegations } from "../api/delegations";
+import { exportInvoicePool } from "../api/exports";
 import {
   archiveInvoice,
   bindInvoice,
@@ -19,9 +20,11 @@ import {
 import { fetchReimbursements } from "../api/reimbursements";
 import { useAuth } from "../auth/AuthContext";
 import { hasPermission } from "../auth/permissions";
+import { downloadBlob } from "../lib/download";
 import { PageHeader } from "../components/common/PageHeader";
 import { Button } from "../components/ui/button";
 import { Card } from "../components/ui/card";
+import { DropdownMenu, DropdownMenuContent, DropdownMenuItem, DropdownMenuTrigger } from "../components/ui/dropdown-menu";
 import { Table, TableBody, TableCell, TableHead, TableHeader, TableRow } from "../components/ui/table";
 
 const PAGE_SIZE = 20;
@@ -267,6 +270,26 @@ export function InvoicePoolPage() {
     },
   });
 
+  const exportMutation = useMutation({
+    mutationFn: (format: "csv" | "xlsx") =>
+      exportInvoicePool({
+        format,
+        status: status || undefined,
+        ownerScope,
+      }),
+    onSuccess: (response, format) => {
+      downloadBlob(response.blob, response.filename ?? `invoice-pool.${format}`);
+      setError("");
+    },
+    onError: (err) => {
+      if (isApiError(err)) {
+        setError(`${err.code}: ${mapApiErrorMessage(err.code, err.details, err.message)}`);
+      } else {
+        setError("导出失败，请稍后重试");
+      }
+    },
+  });
+
   const totalPages = Math.max(1, Math.ceil((listQuery.data?.total ?? 0) / PAGE_SIZE));
   const detail = detailQuery.data;
   const canEditDetail = Boolean(
@@ -281,6 +304,28 @@ export function InvoicePoolPage() {
       <PageHeader
         title="票据中心"
         subtitle="支持上传、OCR 状态轮询、绑定报销与签名预览。"
+        actions={
+          <DropdownMenu>
+            <DropdownMenuTrigger asChild>
+              <Button
+                data-testid="invoice-export"
+                variant="secondary"
+                type="button"
+                disabled={exportMutation.isPending}
+              >
+                {exportMutation.isPending ? "导出中..." : "导出"}
+              </Button>
+            </DropdownMenuTrigger>
+            <DropdownMenuContent align="end">
+              <DropdownMenuItem data-testid="invoice-export-csv" onSelect={() => exportMutation.mutate("csv")}>
+                导出 CSV
+              </DropdownMenuItem>
+              <DropdownMenuItem data-testid="invoice-export-xlsx" onSelect={() => exportMutation.mutate("xlsx")}>
+                导出 Excel
+              </DropdownMenuItem>
+            </DropdownMenuContent>
+          </DropdownMenu>
+        }
       />
 
       {error ? (