[Feature]: 前端配置模型时增加“允许的思考档位”这个设置

[DeepCoach]

Affected Page / Module

AI providers

Use Case

cpa 的特性会导致每个提供商默认允许的思考档位并非完整的 ["max", "xhigh", "high", "medium", "low", "minimal", "none", "auto"]

就拿最常用的 opani-compatible 提供商具体，默认思考档位的参数为：

# openai-compatibility:
...
#         thinking:                      # 可选：省略则默认为级别 ["low","medium","high"]
#           levels: ["low", "medium", "high"]

Current Pain Point

这导致如果我们使用非常常用的 deepseek 模型，若前端不能配置思考档位这个选项，只能去 config 文件每个需要的模型改一遍; 其他需要 max或者 xhigh 的模型同理。

Expected Solution

如果能跟 cpa 官方的前端页面一样有这个功能就好了

这个功能非常需要，谢谢！

Relevant Data Dimensions

• API Key / client
• AI provider
• Model
• Auth file
• Account
• Project
• Time range
• Cost
• Token / usage
• Quota
• Failure reason / error type
• None of these

Expected Acceptance Result

如 Expected Solution 中所言

Priority

Medium: clearly improves usability

Additional Context

No response

Checklist

• I have searched existing Issues and did not find a duplicate request.