fix: harden financial transaction boundaries

apps/admin/src/pages/Bills/index.tsx

@@ -25,6 +25,7 @@ import PermissionButton from '../../components/PermissionButton';
 import { downloadBlob } from '../../utils/download';
 import { message } from '../../ui/app-message';
 import { buildBillPrintHtml, type BillPrintData } from './bill-print';
+import { newOperationId } from '../../utils/operation-id';
 
 
 const statusMap: Record<string, { text: string; color: string }> = {
@@ -93,6 +94,7 @@ const BillsPage: React.FC = () => {
     const values = await generateForm.validateFields();
     try {
       const res: any = await api.post('/bills/generate', {
+        operationId: newOperationId(),
         billingMonth: values.billingMonth.format('YYYY-MM'),
       });
       message.success(res.message || '生成成功');
@@ -128,7 +130,7 @@ const BillsPage: React.FC = () => {
       okText: '确认取消', cancelText: '返回',
       onOk: async () => {
         if (!reason.trim()) { message.error('请输入取消原因'); throw new Error('reason required'); }
-        await api.post(`/bills/${id}/cancel`, { reason: reason.trim() });
+        await api.post(`/bills/${id}/cancel`, { operationId: newOperationId(), reason: reason.trim() });
         message.success('账单已取消，已扣余额已冲正退回');
         fetchData();
       },