fix: enable thinking mode for DeepSeek V3.1 on Fireworks AI

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Related GitHub Issue

Closes: #10071

Description

This PR attempts to address Issue #10071 by enabling thinking mode support for DeepSeek V3.1 on the Fireworks AI provider.

Changes:

• Added supportsReasoningBinary: true flag to the deepseek-v3p1 model definition in the Fireworks provider configuration
• Updated corresponding test to verify the new flag is present

How it works:
When the model has supportsReasoningBinary: true and the user enables reasoning in the API options, the provider will pass thinking: { type: "enabled" } parameter to the Fireworks API, which triggers the reasoning/thinking mode for DeepSeek V3.1.

Feedback and guidance are welcome.

Test Procedure

1. Ran Fireworks provider tests: cd src && npx vitest run api/providers/__tests__/fireworks.spec.ts - All 28 tests passed
2. Ran type checking: cd packages/types && npx tsc --noEmit - No type errors
3. Lint checks passed during commit

Pre-Submission Checklist

• Issue Linked: This PR is linked to an approved GitHub Issue (see "Related GitHub Issue" above).
• Scope: My changes are focused on the linked issue (one major feature/fix per PR).
• Self-Review: I have performed a thorough self-review of my code.
• Testing: New and/or updated tests have been added to cover my changes (if applicable).
• Documentation Impact: I have considered if my changes require documentation updates (see "Documentation Updates" section below).
• Contribution Guidelines: I have read and agree to the Contributor Guidelines.

Documentation Updates

• No documentation updates are required.

Additional Notes

This is a new PR as requested by @hannesrudolph. The fix adds the supportsReasoningBinary capability flag to DeepSeek V3.1 model based on user confirmation that Fireworks documentation supports thinking/reasoning mode for this model via API parameter.

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Important

Adds reasoning mode support to DeepSeek V3.1 model in Fireworks AI by setting supportsReasoningBinary: true.

• Behavior:
  • Adds supportsReasoningBinary: true to deepseek-v3p1 in fireworks.ts to enable reasoning mode.
  • When reasoning is enabled in API options, passes thinking: { type: "enabled" } to Fireworks API.
• Tests:
  • Updates test in fireworks.spec.ts to check for supportsReasoningBinary: true in deepseek-v3p1 model configuration.

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Rooviewer   See task on Roo Cloud

Review complete. No issues identified.

The PR correctly adds supportsReasoningBinary: true to enable thinking mode for DeepSeek V3.1 on Fireworks AI. The implementation follows existing patterns and tests are properly updated.

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