fix(audio): Remove conflicting pulseaudio config

The audio role had both pipewire (with pulse.enable = true) and
pulseaudio configured, which are mutually exclusive. PipeWire's
PulseAudio compatibility layer handles pulse clients, so the
services.pulseaudio block is unnecessary and causes conflicts.

Closes: nixos-configs-0vf

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

roles/audio/default.nix

@@ -24,14 +24,6 @@ in
         pulse.enable = true;
       };
 
-      services.pulseaudio = {
-        package = pkgs.pulseaudioFull;
-        extraConfig = ''
-          load-module module-combine-sink
-          load-module module-switch-on-connect
-        '';
-      };
-
       services.squeezelite = {
         #enable = true;
         pulseAudio = true;