[Feature]: DeepSeek官网API如何设置？

### Class | 类型

大语言模型

### Feature Request | 功能请求

DeepSeek使用了openAI兼容的API，我在 config 中需改重定向，改为：
API_URL_REDIRECT = {"https://api.openai.com/v1/chat/completions": "https://api.deepseek.com/chat/completions"}
但是不起作用。不知道具体如何配置？

Start by locating the configuration entry point for API_URL_REDIRECT and read how the existing OpenAI endpoint mapping is parsed. Check the project’s configuration documentation or tests for supported API providers and redirection behavior. Done means a documented, working configuration path for DeepSeek’s OpenAI-compatible API, with coverage for the reported mapping if tests exist.

Written by the indexing model from the issue text.