Luma-diagnostics

Added
- Post-installation welcome message with quick start guide
- Automatic display of helpful commands when package is first imported
- Improved onboarding experience for new users
- Demo mode that works without API keys (`--demo` flag)
- Mock test functionality for demonstrations and training

Changed
- Updated setup.py with custom installation command
- Enhanced package import process to guide new users
- Improved test result display with color-coded panels
- Better error messages with troubleshooting advice

Added
- Case Management System
- Tracking of multiple tests
- Organization of tests by client/use case
- Structured directory for test results
- Both human-readable and machine-readable result files
- Enhanced CLI Wizard
- Interactive testing interface
- Improved image testing
- API key configuration
- Advanced diagnostic capabilities

Changed
- Simplified default user experience
- Made case management optional for regular users
- Provided advanced case management for power users via CLI flags
- Updated documentation with comprehensive installation and usage guides
- Improved error handling and validation

Fixed
- Various bug fixes and stability improvements
- Enhanced error messages
- Cross-platform compatibility improvements

Added
- Initial release
- Basic API connectivity tests
- Simple image upload functionality
- DNS and network diagnostics
- Basic CLI interface