Add MiniMax provider

[octo-patch]

Reason: add MiniMax-M3 and MiniMax-M2.7 to the provider/model registry.

Summary

• Added both target model aliases to the MiniMax provider registry.
• Added compatible API providers with global defaults and optional China endpoints.
• Fixed image payload encoding for the compatible message client.
• Documented provider selection and added offline endpoint/payload tests.

Checks

• python -m unittest tests/test_minimax_provider.py
• python -m compileall -q os_computer_use tests/test_minimax_provider.py
• uvx --from poetry==2.1.3 poetry check
• git diff --check

[cla-bot]

We require contributors to sign our Contributor License Agreement, and we don't have @octo-patch on file. You can sign our CLA at https://e2b.dev/docs/cla . Once you've signed, post a comment here that says '@cla-bot check'

[cla-bot]

We require contributors to sign our Contributor License Agreement, and we don't have @octo-patch on file. You can sign our CLA at https://e2b.dev/docs/cla . Once you've signed, post a comment here that says '@cla-bot check'

[octo-patch]

Updated this PR to register MiniMax-M3 and MiniMax-M2.7 across both compatible API paths, with selectable global and China endpoints. I added offline request-path and image-payload coverage and ran the focused unit tests, compile checks, Poetry validation, and diff checks.

[octo-patch]

@cla-bot check

[cla-bot]

The cla-bot has been summoned, and re-checked this pull request!