many changes: prepare to allow multiple users

system/games/default.nix

@@ -0,0 +1,37 @@
+{
+  config,
+  pkgs,
+  lib,
+  ...
+}:
+{
+  programs = {
+    gamescope = {
+      enable = true;
+      capSysNice = false;
+      args = [
+        "--output-width 3840"
+        "--nested-width 3840"
+        "--output-height 2160"
+        "--nested-height 2160"
+        "--expose-wayland"
+        "--fullscreen"
+      ];
+    };
+    gamemode.enable = true;
+  };
+
+  services = {
+    ananicy = {
+      enable = true;
+      package = pkgs.ananicy-cpp;
+      rulesProvider = pkgs.ananicy-cpp;
+      extraRules = [
+        {
+          "name" = "gamescope";
+          "nice" = -20;
+        }
+      ];
+    };
+  };
+}