feat: Add new "devstral-2512" Mistral model configuration

[JustinReyes28]

Here's a professional pull request description for the changes made:

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Add devstral-2512 model to Mistral provider

This PR adds support for the new devstral-2512 model to the Mistral provider with the following specifications:

• Context Window: 256,000 tokens (256K)
• Max Tokens: 8,192
• Pricing:
  • Input: $0.40 per million tokens
  • Output: $2.00 per million tokens
• Features:
  • Image support enabled
  • Native tools support enabled
  • Prompt cache not supported

The model has been added to the mistralModels object in packages/types/src/providers/mistral.ts, following the same structure and conventions as other devstral models in the provider.

This addition expands the available model options for users working with Mistral's API, providing access to this new high-context model with competitive pricing and advanced features.

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Latest commit: a74f3b8

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