feat: MiniMax-M2.7 full-model provider path for GBrain shadow layer

[100yenadmin]

Summary

Wire the GBrain Anthropic-style operating layer to MiniMax-M2.7 (full model) via the Anthropic-compatible base URL.

Required mapping

• Keep Anthropic SDK path where possible
• Base URL: https://api.minimax.io/anthropic
• Model: MiniMax-M2.7
• Do not use light/highspeed model for this path

Tasks

• Make current hardcoded Anthropic model configurable
• Add config for GBrain base URL / model
• Verify messages.create, tools, and tool_choice path
• Smoke-test compatibility on real request path
• Document unsupported Anthropic features if any

Acceptance criteria

• Configurable provider/model/base URL exists
• Full-model MiniMax path works for intended GBrain operating-layer calls
• Any incompatibilities are documented and gated

References

• gbrain-minimax-provider-map-2026-04-15