Move Config struct to internal/config with exported fields. Replace
global var config with package-level cfg pointer. Add OpenLogFile to
config package. Add type alias Config = appconfig.Config in main
package for backward compatibility.
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>
JiXieShi