[Feature] Support SMTP XOAuth2 authentication, such as Outlook

### 软件版本 / Release Version

v0.4.4

### 缺陷描述 / Description

在通知渠道中添加SMTP邮件通知，如果配置outlook的 SMTP服务，勾选SSL/TLS发件会提示tls: first record does not look like a TLS handshake，如果不勾选SSL/TLS会提示504错误。

### 复现步骤 / Steps to reproduce

1. 点击菜单授权凭证
2. 选择通知授权
3. 点击新建授权
4. 选择邮件（SMTP）
5. 填写SMTP 服务器：smtp-mail.outlook.com
6. 输入端口：587
7. 勾选SSL/TLS
8. 填写其他选项
9. 提交
10. 测试通知
11. 提示错误：tls: first record does not look like a TLS handshake
12. 取消勾选SSL/TLS并保存
13. 测试通知，提示：504错误

### 日志 / Logs

```console
#hA5U5sElLDXjqOHR4DrEZ 开始
[2025-11-14 15:16:56]
the workflow is starting
#qzBCImAEWRJHDGhjtYyTk 通知
[2025-11-14 15:16:56]
ready to send notification ...
config:
{"provider":"email","providerAccessId":"b1wrd3ryk130b3z","providerConfig":{"receiverAddress":"pw_guo@hotmail.com"},"subject":"Test","message":"TTTTTTTT","skipOnAllPrevSkipped":false}
[2025-11-14 15:16:56]
could not send notification
[2025-11-14 15:16:56]
tls: first record does not look like a TLS handshake
```

### 其他 / Miscellaneous

_No response_

### 贡献 / Contribution

- [ ] 我乐意为此贡献 PR！ / I am interested in contributing a PR for this!

Start from the notification authorization flow described in the reproduction steps, using the SMTP provider configuration for smtp-mail.outlook.com on port 587. Reproduce both TLS errors and trace the email notification path to determine where XOAuth2 support belongs. Done means Outlook SMTP authentication works and a test notification is sent successfully.

Written by the indexing model from the issue text.