feat(zeus): install r2modman

configs/nixos/hosts/zeus/default.nix

@@ -39,6 +39,7 @@
 
   modules.desktop.enable = true;
   modules.desktop.apps.obsidian.enable = true;
+  modules.desktop.apps.r2modman.enable = true;
   modules.desktop.apps.signal.enable = true;
   modules.desktop.apps.steam.enable = true;
   modules.desktop.apps.vencord.enable = true;

configs/nixos/modules/desktop/apps/r2modman.nix

@@ -0,0 +1,19 @@
+{
+  config,
+  lib,
+  pkgs,
+  ...
+}:
+# r2modman, a Thunderstore mod manager.
+let
+  cfg = config.modules.desktop.apps.r2modman;
+  user = config.user.name;
+in
+{
+  options.modules.desktop.apps.r2modman.enable =
+    lib.mkEnableOption "r2modman, a Thunderstore mod manager";
+
+  config = lib.mkIf cfg.enable {
+    home-manager.users.${user}.home.packages = [ pkgs.r2modman ];
+  };
+}