Chutes AI: Add Deepseek v3.1

[dmarkey]

What specific problem does this solve?

Chutes AI provider missing new Deepseek v3.1 in dropdown

(PR ready)

Additional context (optional)

No response

Roo Code Task Links (Optional)

No response

Request checklist

• I've searched existing Issues and Discussions for duplicates
• This describes a specific problem with clear impact and context

Interested in implementing this?

• Yes, I'd like to help implement this feature

Implementation requirements

• I understand this needs approval before implementation begins

How should this be solved? (REQUIRED if contributing, optional otherwise)

Deepseek v3.1 in the list.

How will we know it works? (Acceptance Criteria - REQUIRED if contributing, optional otherwise)

No response

Technical considerations (REQUIRED if contributing, optional otherwise)

No response

Trade-offs and risks (REQUIRED if contributing, optional otherwise)

No response

[roomote]

I'm exploring a potential fix for adding Deepseek v3.1 to the Chutes AI provider dropdown and will open a PR to share progress. Since you mentioned you're interested in implementing this yourself, please feel free to provide any guidance or let me know if you'd prefer to handle this directly.

[roomote]

Opened PR #7295 with my attempt at addressing this issue: #7295

The implementation adds DeepSeek V3.1 to the Chutes AI provider with the same configuration as DeepSeek V3. All tests are passing and CI checks have completed successfully. Feedback welcome!