docs: add OrcaRouter as alternative OpenAI-compatible provider

[XiaoHuo888-hue]

Summary

Adds OrcaRouter as a model provider. OrcaRouter is an OpenAI-compatible model routing gateway that exposes 150+ models from OpenAI, Anthropic, Google, DeepSeek, Qwen, MiniMax, xAI and others behind a single endpoint and API key. It also provides gateway-level security controls for AI agents.

I'm an engineer on the OrcaRouter team.

What this changes

• .env.example: adds an ORCAROUTER_* block alongside the existing MiniMax block
• 00-course-setup/README.md: adds an "Alternative Provider: OrcaRouter (OpenAI-Compatible)" section alongside the existing MiniMax, Novita AI and Foundry Local sections

Why a named provider rather than the OpenAI-compatible escape hatch

The course already lists named alternative providers (MiniMax, Novita AI, Foundry Local) that expose OpenAI-compatible endpoints, and it notes that OpenAIChatClient works with any OpenAI-compatible API. This mirrors that same shape for OrcaRouter, so the config reference and setup docs stay consistent for learners who want a single key that routes to many model families.

How to use it

1. Get an API key at https://www.orcarouter.ai (keys start with sk-orca-).
2. Set ORCAROUTER_API_KEY in your .env (optionally ORCAROUTER_BASE_URL, ORCAROUTER_MODEL_ID).
3. Pick a model id such as orcarouter/auto, anthropic/claude-sonnet-4.6 or openai/gpt-5.5. The full catalog is available from the OrcaRouter model directory.

Verification

• Live API against https://api.orcarouter.ai/v1/chat/completions:
  • orcarouter/auto returns 200 (routes to an upstream reasoning model)
  • anthropic/claude-sonnet-4.6 returns 200
  • Invalid sk-orca- key returns 401
• All model ids listed in the docs (orcarouter/auto, anthropic/claude-sonnet-4.6, openai/gpt-5.5, google/gemini-2.5-flash, deepseek/deepseek-v4-flash-0731) are present in the OrcaRouter model catalog.

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[Copilot]

Pull request overview

This PR updates the course setup documentation to include OrcaRouter as an additional OpenAI-compatible model provider option, alongside existing alternative providers, and adds corresponding environment variable placeholders to help learners configure it consistently.

Changes:

• Added an “Alternative Provider: OrcaRouter (OpenAI-Compatible)” section to the course setup README with required .env variables and example model IDs.
• Added ORCAROUTER_* environment variable entries to .env.example next to the existing MiniMax block.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
00-course-setup/README.md	Documents OrcaRouter as an OpenAI-compatible alternative provider, including required env vars and usage notes.
.env.example	Adds an ORCAROUTER_* configuration block to mirror the documentation and guide local setup.

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