- Expand README_EN.md with comprehensive feature documentation
- Add complete header with badges and repository info
- Include detailed feature sections (Email Processing, User Management, Admin Features, etc.)
- Add Technical Architecture section with system design details
- Include Service Status Monitoring and Star History
- Add Table of Contents for better navigation
- Add Important Notes about Resend domain configuration
- Create CHANGELOG_EN.md with full translation
- Translate all version entries from v1.2.0 to initial releases
- Preserve technical details, issue references, and breaking changes
- Maintain consistent formatting with Chinese version
- Add language switch links to both CHANGELOG files
- Enable easy navigation between Chinese and English versions
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-authored-by: Claude Sonnet 4.5 <noreply@anthropic.com>
