Routes MiniMax OAuth device-code and token polling directly to account-hosted OAuth2 endpoints for global and CN regions, avoiding guarded-fetch cross-origin redirect body stripping. Keeps provider API base URLs unchanged and adds regression coverage for both endpoint pairs.
Proof: local minimax OAuth tests, oxfmt check, lint, autoreview clean, official MiniMax CLI/source check, live MiniMax endpoint probes, and CI run 26729242892 on 6bfe20eb06.
Co-authored-by: Matt Schleder <schledermatthew@gmail.com>
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