feat: add OrcaRouter as a first-class quick-LLM provider

[Marc-oss-hub]

Summary

Adds OrcaRouter as a first-class LlmProvider in GitReverse's quick-reverse LLM path, mirroring the existing OpenRouter wiring. OrcaRouter is an OpenAI-compatible AI gateway that serves a single base URL with namespaced model ids (e.g. anthropic/claude-sonnet-5), so it slots straight into the existing chat/completions call path with no transport changes. 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.

What this adds

• lib/quick-llm.ts — new orcarouter provider in the LlmProvider union, ORCAROUTER_URL constant, orcarouterTargetFromApiKey() (defaults to anthropic/claude-sonnet-5, overridable with ORCAROUTER_MODEL), added to the GITREVERSE_QUICK_LLM=auto key-resolution chain and the explicit GITREVERSE_QUICK_LLM=orcarouter branch, plus providerDisplayName and the auth-error hint.
• app/api/reverse-prompt/route.ts — the same provider wiring in the reverse-prompt route's self-contained resolver (this route keeps its own copy of the provider registry).
• .env.example — ORCAROUTER_API_KEY + optional ORCAROUTER_MODEL, and updated GITREVERSE_QUICK_LLM docs.
• README.md — OrcaRouter added to the provider table and the auto preference order.

Why a named provider

GitReverse already treats OpenRouter as a named first-class provider (GITREVERSE_QUICK_LLM=openrouter with a default model and key env var). OrcaRouter is the same shape — an OpenAI-compatible gateway with namespaced model ids — so it gets a discoverable named slot instead of a generic "edit the URL yourself" instruction. The namespaced default matters: the gateway rejects bare model names, so shipping anthropic/claude-sonnet-5 as the default makes the provider work out of the box.

Changes

File	Change
lib/quick-llm.ts	LlmProvider + ORCAROUTER_URL + orcarouterTargetFromApiKey + auto/resolve/display/auth-hint wiring
app/api/reverse-prompt/route.ts	mirrored provider wiring in the route's inline resolver
.env.example	ORCAROUTER_API_KEY / ORCAROUTER_MODEL docs
README.md	provider table row + auto order

Verification

• tsc --noEmit — clean
• pnpm lint (eslint) — the only failure is a pre-existing issue on main unrelated to this change: react-hooks/set-state-in-effect in lib/use-partner-preview.ts:13. Verified by stashing this change and running pnpm lint on clean main — same error. None of the touched files produce lint errors.
• Live test of the exact callQuickLlm path with a real ORCAROUTER_API_KEY: POST https://api.orcarouter.ai/v1/chat/completions with anthropic/claude-sonnet-5 → HTTP 200 with a model response.

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