Add MiniMax M3 to model recommendations

[octo-patch]

Reason: MiniMax-capable model registry includes MiniMax-M2.7 but is missing MiniMax-M3 from the target top models.

Summary

• Add MiniMax-M3 ahead of MiniMax-M2.7 in the Qingchen provider model catalog.
• Correct the MiniMax-M2.7 context window and add MiniMax-M3 to the feature panel recommendations.
• Document both target models, complete tiered pricing, and global/China OpenAI- and Anthropic-compatible endpoint configuration.

Checks

• node --check translations/panel/feature-panel.js
• jq empty for all translation JSON files and package.json
• Runtime catalog assertion for model order and context windows
• Documentation example validated with openclaw config validate on OpenClaw 2026.6.11
• Request captures for global/China OpenAI Chat Completions and Anthropic Messages paths

[octo-patch]

Updated the model guide with verified MiniMax-M3 and MiniMax-M2.7 capabilities, tiered pricing, and global/China OpenAI- and Anthropic-compatible configuration. I also validated the catalog entries, the documentation config against OpenClaw 2026.6.11, and all four endpoint request paths.