Migrate to NixOS 24.05 stable branch

- Update flake.nix to use nixos-24.05 and home-manager release-24.05
- Remove deprecated services.pulseaudio configurations
- Fix home-manager compatibility issues:
  - Update stateVersion from 24.11 to 24.05
  - Change VSCode profiles.default.extensions to extensions
  - Update ZSH initContent to initExtra
  - Remove incompatible git signing.format option
- Remove unavailable windsurf package from dev.nix
- Successfully tested with nixos-rebuild dry-run

desktop/dev.nix

@@ -6,8 +6,6 @@ environment.systemPackages = with pkgs; [
    (python3.withPackages(ps: with ps; [ pandas requests python-dotenv pip uv ]))
   nodejs
   rpi-imager
-  windsurf
-  nodejs
   ];
 
 programs.nix-ld.enable = true;