Fix conflicting audio role config: remove pulseaudio, keep pipewire

Remove services.pulseaudio configuration that conflicted with
services.pipewire. PipeWire replaces PulseAudio and provides
compatibility through pulse.enable.

Also added alsa.enable and alsa.support32Bit for better ALSA support.

machines/john-endesktop/MIGRATION_PLAN.md

@@ -170,6 +170,7 @@ This document outlines the plan to migrate the john-endesktop server from Arch L
    ```bash
    blkid /dev/nvme0n1p5
    # Note the UUID for updating hardware-configuration.nix
+/dev/nvme0n1p5: LABEL="nixos" UUID="5f4ad025-bfab-4aed-a933-6638348059e5" UUID_SUB="4734d820-7b8a-4b7f-853a-026021c1d204" BLOCK_SIZE="4096" TYPE="btrfs" PARTLABEL="data" PARTUUID="9ea025df-cdb7-48fd-b5d4-37cd5d8588eb"
    ```
 
 8. **Copy your NixOS configuration to the server**
@@ -388,11 +389,11 @@ After successful migration and 24-48 hours of stable operation:
 
 Pre-migration:
 - [x] nvme0n1p5 removal from media pool complete
-- [ ] Recent backup verified (< 24 hours)
-- [ ] Maintenance window scheduled
-- [ ] NixOS ISO downloaded
-- [ ] Bootable USB created
-- [ ] NixOS config builds successfully
+- [x] Recent backup verified (< 24 hours)
+- [x] Maintenance window scheduled
+- [x] NixOS ISO downloaded
+- [x] Bootable USB created
+- [x] NixOS config builds successfully
 
 During migration:
 - [ ] ZFS pools exported

roles/audio/default.nix

@@ -21,17 +21,11 @@ in
 
       services.pipewire = {
         enable = true;
+        alsa.enable = true;
+        alsa.support32Bit = true;
         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;