🐛 fix(contract): 修复合同续期金额显示问题

- 为amount添加Number类型转换，确保toFixed方法正确执行

src/client/admin/pages/ContractRenews.tsx

@@ -280,7 +280,7 @@ const ContractRenews: React.FC = () => {
       dataIndex: 'renewAmount',
       key: 'renewAmount',
       width: 100,
-      render: (amount: number) => `￥${amount.toFixed(2)}`,
+      render: (amount: number) => `￥${Number(amount).toFixed(2)}`,
     },
     {
       title: '状态',