feat: add OrcaRouter as a first-class provider

[martinzudergaming-a11y]

Add OrcaRouter as a first-class provider in the API profile settings.

OrcaRouter is an OpenAI-compatible AI gateway built for both models and agents. Like OpenRouter, it exposes a provider/model namespace across many models — but it also combines adaptive routing, automatic failover, zero-markup inference, observability, guardrails, and agent-tool governance behind the same endpoint. Adding orcarouter as a named provider means Zoo Code users can use that stack directly, without treating OrcaRouter as an anonymous custom base URL. It also runs gateway-level, zero-trust security for AI agents on the same endpoint — screening every prompt/response and governing every tool call on a default-deny basis, with no application code changes.

This mirrors the existing NanoGPT provider wiring in your provider registry: new orcarouter identifier in provider-identifiers.ts, a handler extending RouterProvider over the OpenAI protocol, a fetcher for the public model catalog at https://api.orcarouter.ai/v1/models, settings schema, UI component, validation, and i18n strings. The model picker stays consistent with the other dynamic providers.

Verification

• tsc --noEmit green across all packages; pnpm test 7933 passed (webview + src).
• L3 live check against the real API: GET /v1/models → 204 models; streaming and non-streaming chat completions via the same OpenAI SDK client both returned 200.

Discord: discord.gg/YEubt8enRA · X: https://x.com/OrcaRouter

I'm an engineer on the OrcaRouter team.

Closes #1463

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