Add comprehensive documentation for the minimax-oauth provider.
New file: website/docs/guides/minimax-oauth.md
- Overview table (provider ID, auth type, models, endpoints)
- Quick start via 'hermes model'
- Manual login via 'hermes auth add minimax-oauth'
- --region global|cn flag reference
- The PKCE OAuth flow explained step-by-step
- hermes doctor output example
- Configuration reference (config.yaml shape, region table, aliases)
- Environment variables note: MINIMAX_API_KEY is NOT used by
minimax-oauth (OAuth path uses browser login)
- Models table with context length note
- Troubleshooting section: expired token, timeout, state mismatch,
headless/remote sessions, not logged in
- Logout command
Updated: website/docs/getting-started/quickstart.md
- Add MiniMax (OAuth) to provider picker table as the recommended
path for users who want MiniMax models without an API key
Updated: website/docs/user-guide/configuration.md
- Add 'minimax-oauth' to the auxiliary providers list
- Add MiniMax OAuth tip callout in the providers section
- Add minimax-oauth row to the provider table (auxiliary tasks)
- Add MiniMax OAuth config.yaml example in Common Setups
Updated: website/docs/reference/environment-variables.md
- Annotate MINIMAX_API_KEY, MINIMAX_BASE_URL, MINIMAX_CN_API_KEY,
MINIMAX_CN_BASE_URL as NOT used by minimax-oauth
- Add minimax-oauth to HERMES_INFERENCE_PROVIDER allowed values
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