Rewrite README.md in Chinese and English with flag tables, command
reference, plugin API, and architecture diagram. Update CLAUDE.md
to reflect the new package layout and build commands.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
Extract ConvertChunk/FormatHexFrame into pkg/charset (zero external deps).
Extract UIEvent/UIEventKind/UIPanelKind types into internal/event.
Update all references across main package to use qualified imports.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>