feat: add Kimi K2.5 support to Fireworks AI provider

[nakamorichi]

• Added accounts/fireworks/models/kimi-k2p5 model configuration

Related GitHub Issue

Closes: #11033

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Description

Test Procedure

Confirmed behavior locally.

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.

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Documentation Updates

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Important

Add kimi-k2p5 model support to Fireworks AI provider, updating default model and configuration in fireworks.ts.

• Behavior:
  • Adds accounts/fireworks/models/kimi-k2p5 to FireworksModelId in fireworks.ts.
  • Sets fireworksDefaultModelId to accounts/fireworks/models/kimi-k2p5 in fireworks.ts.
• Models:
  • Adds configuration for kimi-k2p5 in fireworksModels with properties like maxTokens, contextWindow, supportsImages, and pricing details.

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[roomote]

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Review complete. No issues found.

The PR correctly adds Kimi K2.5 model support to the Fireworks AI provider with valid configuration matching the ModelInfo schema. The type constraint improvement from Record<string, ModelInfo> to Record<FireworksModelId, ModelInfo> is a nice addition for better type safety.

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