refactor(de): move plasma config to separate file

modules/programs/default.nix

@@ -9,7 +9,8 @@
 
   ]
   ++ (if currentSystemDe == "niri" then [ ./niri.nix ] else [ ])
-  ++ (if currentSystemDe == "gnome" then [ ./gnome.nix ] else [ ]);
+  ++ (if currentSystemDe == "gnome" then [ ./gnome.nix ] else [ ])
+  ++ (if currentSystemDe == "plasma" then [ ./plasma.nix ] else [ ]);
 
   programs = {
     gamescope = {

modules/programs/plasma.nix

@@ -0,0 +1,15 @@
+{ pkgs, ... }:
+{
+  services = {
+    displayManager.sddm = {
+      enable = true;
+      wayland.enable = true;
+    };
+    desktopManager.plasma6.enable = true;
+  };
+
+  environment.plasma6.excludePackages = with pkgs.kdePackages; [
+    elisa
+    konsole
+  ];
+}