✨ (modules/flake) improve library loading and implement system class module mappings

modules/nixos/utils/vm/default.nix

@@ -0,0 +1,43 @@
+{
+  lib,
+  config,
+  namespace,
+  puzzlelib,
+  ...
+}:
+let
+  inherit (lib) mkIf mkMerge;
+  inherit (puzzlelib) mkOpt mkBool;
+
+  cfg = config.${namespace}.utils.vm;
+in
+{
+  options.${namespace}.utils.vm = {
+    enable = mkBool true "Whether to enable custom vm presets";
+    preset = mkOpt lib.types.str "performance" "Specify the prefered vm settings preset: performance, balance or powersave";
+  };
+
+  config = mkIf cfg.enable {
+    virtualisation.vmVariant = mkMerge [
+      (mkIf cfg.preset == "performance" {
+        virtualisation = {
+          cores = 6;
+          memorySize = 4096;
+          graphics = true;
+        };
+      })
+      (mkIf cfg.preset == "balance" {
+        virtualisation = {
+          cores = 4;
+          memorySize = 2048;
+        };
+      })
+      (mkIf cfg.preset == "powersave" {
+        virtualisation = {
+          cores = 2;
+          memorySize = 1024;
+        };
+      })
+    ];
+  };
+}