- internal/volume: IAudioEndpointVolume via COM (pure Go, no CGO)
  - Get/Set master volume (0-100%)
  - GetMute/SetMute
  - Uses WASAPI instead of deprecated MMSystem mixer API
- server: /api/volume now uses system volume (0-100, was Winamp 0-255)
- server: new /api/mute endpoint (GET + POST ?muted=true|false)
- server: volume+mute included in /api/status response
- frontend: mute button with visual state (🔊/🔇, red bar when muted)
- frontend: volume display as percentage label

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

- Go HTTP server with Winamp IPC via WM_USER/WM_COMMAND
- internal/winamp: TWinampControl port (play/pause/stop/seek/volume/title/playlist)
- internal/killist: persistent skip-list (port of Delphi KillFile feature)
- internal/resume: JSON-based resume state (port of Delphi resume.dat)
- internal/server: HTTP API + background killist checker + resume restore
- web/static: mobile-first touch UI (dark theme, progress bar, seek buttons)
- config.yaml.example for winamp path / port / file paths

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>