Do not remove deepseek-r1-671b from the API

The reason given is that qwen3-235b is a better model, but I disagree very much. It does not hold a candle to Deepseek. I have used Deepseek for all my work and is essential. qwen3 is not a sufficiently good replacement.

I’d be even willing to pay a premium to keep access. Please do not retire DeepSeek.

Alternatively, introduce DeepSeek-V3.1.