OpenRouter Trinity model names don't indicate free tier

[ruben-blok]

The OpenRouter models for Trinity Mini and Trinity Large Preview don't have (free) in their names, making it unclear they're free tier models.

Models affected:

• arcee-ai/trinity-mini:free currently named "Trinity Mini"
• arcee-ai/trinity-large-preview:free currently named "Trinity Large Preview"

Expected:
Names should include (free) suffix like other free tier models.

Fix:
Update model names to:

• Trinity Mini (free)
• Trinity Large Preview (free)

[github-actions]

This issue might be a duplicate of existing issues. Please check:

• OpenRouter.ai provider: Not listing google/gemma-3-27b-it:free variant #10748: OpenRouter.ai provider: Not listing google/gemma-3-27b-it:free variant - deals with free tier model visibility and naming issues with OpenRouter models

Feel free to ignore if none of these address your specific case.