docs: update README and README_CN

[enderfirst]

Summary

• Problem:
• Changes:
• Related Issue: #

Change Type

• Bug fix
• Feature
• Refactor
• Docs
• Other

Scope

• Core shell / PTY
• AI agent / LLM
• Skills / Tools
• Security
• Configuration
• CLI / Interface
• Packaging / Installation
• CI/CD
• Documentation

User-visible Changes

Compatibility

• Backward compatible? (Yes/No)
• Config changes? (Yes/No - if yes, describe migration)

Testing

Checklist

• Code follows project style
• Tests added if needed
• Documentation updated if needed

[github-actions]

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Contribution guide: https://github.com/AI-Shell-Team/aish/blob/main/CONTRIBUTING.md

[github-actions]

This pull request description looks incomplete. Please update the missing sections below before review.

Missing items:

• User-visible Changes
• Testing

[enderfirst]

add-linuxdo-friend-linkadd LINUX DO friend link in README