Enhance GitHub Copilot instructions: Add README.rst guidelines and cross-file consistency validation

- Integrate translation guidelines from README.rst for proper formatting
- Add full-width/half-width punctuation rules enforcement
- Include Chinese-English spacing requirements validation
- Add high-frequency terms preservation rules (int, float, str, etc.)
- Implement cross-file terminology consistency checking
- Add project-wide validation algorithms and commands
- Include automated GitHub Actions workflow for consistency
- Update commands to work across entire project using find
- Add comprehensive README.rst compliance validation
- Enhance feedback templates with cross-project validation

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

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

Author: josix