Issues regarding the duration of historical monitoring data that can be queried.

### Question and Steps to reproduce

开源版在测试中发现，使用快捷视图和监控大盘中能看到的历史数据曲线图最多就到15-16天，请问这在哪里可以调整？看文档和issue中没有相关介绍和问题。

<img width="1423" height="324" alt="Image" src="https://github.com/user-attachments/assets/0727934d-717a-46db-b055-4d758d7c28e4" />

### Relevant logs and configurations

```text
无
```

### Version

n9e-v8.4.0-linux-amd64
categraf-v0.4.20-linux-amd64
prometheus-2.28.0.linux-amd64