[Bug] Email notifications occasionally contain garbled text

### Contact Information

_No response_

### 1Panel Version

2.0.15

### Problem Description

乱码见于邮件主题与发件人显示名称

<img width="540" height="252" alt="Image" src="https://github.com/user-attachments/assets/6025e425-4a2d-4dbc-a396-494dee5ec069" />

### Steps to Reproduce

*

### The expected correct result

_No response_

### Related log output

```shell

```

### Additional Information

_No response_