Add GitHub Copilot translation review instructions

- Create comprehensive AI-readable translation review guide
- Include automated detection patterns for common issues
- Provide structured feedback templates and quality scoring
- Enable systematic review of Traditional Chinese translations
- Based on decimal.po translation project experience

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

Author: josix