[feature]: Support for Minimax China Coding Plan

[sagelga]

Pre-flight checks

• I searched existing issues and did not find a duplicate request.
• I reviewed current behavior on the production released OpenCode version.

OpenCode version reviewed

1.14.40

Problem statement

The stats tracker does supports the Minimax International (via #32) but not with the China endpoint

Proposed change

Have it supported https://api.minimaxi.com

Alternatives considered

No response

Acceptance criteria

No response

[slkiser]

@sagelga Added in v3.8.0

[sagelga]

Thank you so much for implementing!