平台兼容 OpenAI API 规范。把 base_url 指向我们的端点、替换 Key，现有 SDK 与调用代码即可继续使用。
curl https://api.example.com/v1/chat/completions \ -H "Authorization: Bearer $TOKENHUB_API_KEY" \ -H "Content-Type: application/json" \ -d '{ "model": "deepseek-chat", "messages": [{"role": "user", "content": "你好"}], "stream": true }'
