- Add CLI i18n module (astrbot/cli/i18n.py) with zh/en translations
- Add TUI i18n module (astrbot/tui/i18n.py) with zh/en translations
- Update CLI commands to use translated strings
- Update TUI app and screen to use translated strings
- Add ASTRBOT_CLI_LANG and ASTRBOT_TUI_LANG to .env.example
- Update cmd_run.py env var documentation
- Add backward compatibility for moved modules with DeprecationWarning