docs: add Opus 4.7, Kimi K2.6, and MiniMax M2.7 to model docs

[factory-zimu]

Summary

• add Kimi K2.6 across the CLI reference, settings, model-selection, token-efficiency, droid-exec, org-control, and pricing docs
• add MiniMax M2.7 across pricing, settings, droid-exec, model-selection, and org-control docs so the documented model lists stay aligned
• align Opus 4.7 in the settings, droid-exec, and org-control model lists, and remove unsupported glm-5.1 pricing entries so the documented model contract stays consistent

Validation

• git diff --check

[factory-droid]

Droid finished @factory-zimu's task —— View job

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[factory-droid]

Kimi K2.6 is integrated consistently across the updated docs. There are a few pre-existing model-list inconsistencies (opus-4-7, claude-opus-4-7, and glm-5.1) that should be reconciled to keep the documented configuration contract unambiguous.

[factory-zimu]

ensure the 3 models are added across all files consistently. I didn't exhaustively comment in every file so you need to check even if the file has no comment