定时任务不能保存

### Qinglong version

v2.20.2

### Steps to reproduce

<img width="1920" height="879" alt="Image" src="https://github.com/user-attachments/assets/113111c0-a664-45be-ac5a-8d8b232488ba" />

### What is expected?

能正常保存cron表达式

### What is actually happening?

不能保存cron表达式，修改原来的也是一样不能保存

### System Info

```shell

```

### Any additional comments?

_No response_