docs: Add comprehensive API reference manual
- Complete API documentation for zcatui v2.2
- All 35 widgets documented with examples
- Core types: Buffer, Style, Text, Layout
- Terminal interface and event handling
- Animation, focus, themes systems
- v2.2 features: resize, drag, debug, profiler
- Utilities: clipboard, hyperlinks, notifications
- File index with all 70+ source files
- 1100+ lines of documentation
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
reugenio
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