- Add README_CN.md with proxy setup guide for users in China
- Add language switcher to both READMEs
- Add set_proxy/clear_proxy to More Commands section
- Update default model to claude-opus-4-6
- Add Nanobot to acknowledgments
- Update ARCHITECTURE.md: proxy module, stack sizes, NVS config
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>