Add TrustedRouter provider

[jperla]

Summary

• add a TrustedRouter provider backed by the OpenAI-compatible profile
• document the TrustedRouter setup with base URL https://api.trustedrouter.com/v1
• add provider export and tests for the TrustedRouter profile

Testing

• git diff --check
• Not run: bun tests, because bun is not installed in this environment

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[github-actions]

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[jperla]

Moved this to the provider catalog repo that Opencode consumes: anomalyco/models.dev#2885