feat: enable prompt caching for Cerebras zai-glm-4.7 model

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Related GitHub Issue

Closes: #10601

Description

This PR attempts to address Issue #10601 by enabling prompt caching for the Cerebras zai-glm-4.7 model.

The change is straightforward - updated supportsPromptCache from false to true in the model configuration at packages/types/src/providers/cerebras.ts.

This aligns with the Cerebras documentation which confirms that zai-glm-4.7 supports prompt caching.

Test Procedure

• Ran existing Cerebras tests via cd src && npx vitest run api/providers/__tests__/cerebras.spec.ts - all 17 tests pass
• The change is a configuration flag update with no logic changes

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

Feedback and guidance are welcome.

---

Important

Enable prompt caching for zai-glm-4.7 by updating supportsPromptCache to true in cerebras.ts.

• Behavior:
  • Enable prompt caching for zai-glm-4.7 by setting supportsPromptCache to true in cerebras.ts.
• Testing:
  • All 17 existing tests in cerebras.spec.ts pass, confirming no logic changes.

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Review complete. No issues found.

The change correctly enables prompt caching for the zai-glm-4.7 model, aligning with Cerebras documentation.

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