Base URL for DeepSeek does not work

[pbtsrc]

From the DeepSeek documentation (https://api-docs.deepseek.com/) the actual URLs are: https://api.deepseek.com https://api.deepseek.com/v1

Unfortunately, both URLs do not work in the eclipse-chatgpt-plugin (Request failed with status code: 404 and response body: {"error_msg": "Not Found. Please check the configuration."}). These URLs work without issue in other LLM chat apps (Open WebUI, etc.).

The https://api.deepseek.com/v1/chat/completions works in the eclipse-chatgpt-plugin, but it's not documented anywhere