Add MiniMax (api.minimax.io/v1) as a first-class third-party provider,
enabling direct API access without routing through NVIDIA/SiliconFlow/
OpenRouter intermediaries. Includes M2.5 and M2.5-highspeed models
with 204K context window.
Changes:
- Register "minimax" in _THIRD_PARTY_PROVIDERS with MINIMAX_API_KEY
- Add MiniMax-M2.5 and MiniMax-M2.5-highspeed model entries
- Add minimax_api_key to config, env mappings, and env export
- Add MiniMax to onboarding wizard with API key validation
- Update .env.example, README.md, README.zh-CN.md
- Add 9 unit tests and 3 integration tests (all passing)
Co-authored-by: PR Bot <pr-bot@minimaxi.com>
Co-authored-by: Xi Zhang <106144707+X-iZhang@users.noreply.github.com>
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