Add TrustedRouter as a built-in provider

[jperla]

Adds TrustedRouter (attested OpenAI-compatible router) as a built-in provider, following the same shape as the OpenRouter/Groq definitions:

• src/shared/providers/definitions/trustedrouter.ts — provider definition with router-alias curated models (trustedrouter/auto, zdr, e2e, cheap) and https://api.trustedrouter.com/v1 host
• src/shared/providers/definitions/models/trustedrouter.ts — OpenAICompatible model class
• registered in ModelProviderEnum, the provider index, aiProviderNameHash, the provider menu list, and the models.dev provider mapping (TrustedRouter is listed on models.dev, so remote model listing works)
• provider icon PNG (108×108, matching existing icons)

Verified: provider + model-registry vitest suites pass (72 passed, including the models.dev contract test), biome lint clean on the new files, and tsc reports no errors in the changed files.

This reworks the earlier docs-only version of this PR into a code integration.

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[jperla]

Checking in on this docs PR. The checks look clean from my side. Is there anything else you would want changed before this can move forward?

[jperla]

Friendly follow-up on this docs PR. The checks look clean from my side; happy to adjust wording or placement if there is a preferred format for OpenAI-compatible providers.

[jperla]

Still current against main. Happy to adjust to your docs conventions — shorter, different placement, or generalized to a custom-provider example. Quick turnaround on any feedback.