feat(api): migrate Mistral provider to AI SDK

[daniel-lxs]

Summary

Migrate the Mistral provider from using the direct @mistralai/mistralai SDK to the AI SDK's dedicated @ai-sdk/mistral package.

Changes

1. src/api/providers/mistral.ts

• Replaced the direct @mistralai/mistralai SDK with @ai-sdk/mistral
• Uses createMistral to create the provider instance
• Uses streamText and generateText from the AI SDK v6 for completions
• Leverages shared AI SDK utilities for consistent message/tool handling
• Maintains support for Codestral models with custom base URL
• Follows the same pattern as the Cerebras handler

2. src/package.json

• Added @ai-sdk/mistral: ^3.0.0 to dependencies (v3.x required for AI SDK v6 compatibility)

3. src/api/providers/__tests__/mistral.spec.ts

• Complete test suite with 23 tests passing

Testing

• All unit tests pass (5325 passed)
• TypeScript compilation successful

Linear

Resolves EXT-692

---

Important

Migrates Mistral provider to use @ai-sdk/mistral, updating mistral.ts and tests for AI SDK v6 compatibility.

• Behavior:
  • Migrates Mistral provider to use @ai-sdk/mistral in mistral.ts.
  • Utilizes createMistral, streamText, and generateText from AI SDK v6.
  • Supports Codestral models with custom base URL.
• Testing:
  • Updates mistral.spec.ts to mock @ai-sdk/mistral and test new behavior.
  • Ensures all 23 tests pass.
• Dependencies:
  • Adds @ai-sdk/mistral: ^3.0.0 to package.json dependencies.

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[roomote]

Rooviewer   See task on Roo Cloud

Review completed. All issues have been resolved.

• Default temperature changed from 1 to 0 due to unreachable MISTRAL_DEFAULT_TEMPERATURE fallback (comment)

Previous reviews

• 41991ab: Review #1
• 6e87953: Review #2
• de2f78e: Review #3

_{Mention @roomote in a comment to request specific changes to this pull request or fix all unresolved issues.}

[mrubens]

@roomote please fix the compile and knip errors

[roomote]

Coderoo   See task on Roo Cloud

Fixed the reported issues. All local checks passed.

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