docs: Add comprehensive CyberMood global theme system documentation
- Created GLOBAL_THEME_SYSTEM.md with complete theme specification
- Added THEME_CONTEXT.md for quick AI assistant reference
- Defined CyberMood design language (metallic, glass, neon aesthetics)
- Provided ready-to-use templates (CSS variables, components, JS controller)
- Planned multi-language support (en, fr, de, es)
- Created 5-week implementation roadmap
- Added 5 ready-to-use prompts for theme implementation
- Updated network-modes module with travel mode support
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>
CyberMind-FR
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