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

users/jsutter.nix

@@ -61,7 +61,7 @@
       home.username = "jsutter";
       home.homeDirectory = "/home/jsutter";
       programs.home-manager.enable = true;
-      home.stateVersion = "24.11";
+      home.stateVersion = "24.05";
       services.syncthing.tray.enable = false;
 
       # Set environment variables here
@@ -74,7 +74,6 @@
         enable = true;
         userName  = "Julian Sutter";
         userEmail = "jsutter@symbiotip.com";
-        signing.format = "ssh";
         extraConfig = {
           core.editor = "nano";
           credential.helper = "store";
@@ -87,7 +86,7 @@
       programs.vscode = {
         enable = true;
         package = pkgs.vscodium;
-        profiles.default.extensions = with pkgs.vscode-extensions; [
+        extensions = with pkgs.vscode-extensions; [
           dracula-theme.theme-dracula
           yzhang.markdown-all-in-one
           mkhl.direnv
@@ -102,7 +101,7 @@
         enable = true;
         enableCompletion = false; # enabled in oh-my-zsh
         autosuggestion.enable = true;
-        initContent = ''
+        initExtra = ''
           test -f ~/.dir_colors && eval $(dircolors ~/.dir_colors)
         '';
         shellAliases = {