docs: add OrcaRouter as a named compatible provider

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What

claw0 teaches you to build a minimal AI agent gateway from scratch, section by section. The .env.example already tells users they can plug in "Anthropic API or compatible providers (e.g. OpenRouter)" via ANTHROPIC_BASE_URL — but OpenRouter is the only provider called out by name.

This PR adds OrcaRouter as a second named, copy-paste-friendly example so users who follow the Quick Start can point claw0 at OrcaRouter the same way they already can at OpenRouter — without treating it as an anonymous custom base URL.

Why OrcaRouter

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 first-class provider means this project's 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.

What changed

• .env.example — add an OrcaRouter block mirroring the existing OpenRouter comment: ANTHROPIC_BASE_URL=https://api.orcarouter.ai with MODEL_ID=orcarouter/auto, and mention it in the "compatible providers" header line.
• README.md / README.zh.md / README.ja.md — in the Quick Start "Configure" step, add one line noting OrcaRouter works as a named provider through the same ANTHROPIC_BASE_URL mechanism.

How I verified

• Every session's Python file still compiles (python3 -m py_compile).
• Live-tested through the exact code path the sessions use — the Anthropic SDK pointed at ANTHROPIC_BASE_URL:

resp.id=2a85c59e-6dc9-4506-88cd-573629192290
model=deepseek-v4-flash
stop_reason=max_tokens
text='OK'
LIVE_OK

The SDK's base_url is used as the API root (it appends /v1/messages), and orcarouter/auto returns a real completion.

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

I'm an engineer on the OrcaRouter team.