question: 在PIAgent的配置当中，没有默认的推理强度匹配

### 你想完成什么 / What are you trying to do

在自定义模型的时候，使用的是类似Deepseek这样的官方API，但是在PIAgent的配置当中，没有默认的推理强度匹配

### 已尝试的步骤 / What you have tried

希望能自动索引模型，匹配一下支持的默认信息，包括推理强度信息，包括最大上下文。

### 环境 / Environment

- Cindy 版本或 commit / version or commit:
- 平台与版本 / platform & OS version:

Start by locating the PIAgent configuration and the code that handles custom model or provider metadata. Trace how reasoning strength and maximum context are represented, then clarify which model information can be indexed automatically. Done should mean supported defaults are matched for custom official APIs, including reasoning strength and context limits.

Written by the indexing model from the issue text.