Refresh MiniMax presets for M3

[octo-patch]

Reason: llmprovider/presets.yml is a go:embed static provider preset directory, with existing MiniMax presets minimax_intl and minimax_cn but models only up to M2.7.

Summary

• Add MiniMax-M3 and MiniMax-M3-thinking to both international and CN MiniMax presets.
• Refresh MiniMax OpenAI-compatible base URLs to the current global and CN endpoints.

Checks

• git diff --check
• go test ./llmprovider (fails: go.mod replaces github.com/yaoapp/gou and github.com/yaoapp/kun with missing local ../gou and ../kun directories)
• python3 assertion check for MiniMax M3 entries and base URLs