Feature Request: DeepSeek-3.1-Base

[createthis]

Prerequisites

• I am running the latest code. Mention the version if possible as well.
• I carefully followed the README.md.
• I searched using keywords relevant to my issue to make sure that I am creating a new issue that is not already open (or closed).
• I reviewed the Discussions, and have a new and useful enhancement to share.

Feature Description

Add DeepSeek-3.1-Base support.

Motivation

Why not? Everyone says it's a base model, but I thought it would be fun to try.

Possible Implementation

#15437

[createthis]

Apparently the PR I linked works, but closing because a base model probably isn't that useful. TIL.