add nextcloud and prusaslicer clients

modules/features/nextcloud/default.nix

@@ -0,0 +1,8 @@
+{...}: {
+  # Nextcloud desktop sync client. Account and sync settings remain per-user.
+  flake.nixosModules.nextcloud = {pkgs, ...}: {
+    environment.systemPackages = with pkgs; [
+      nextcloud-client
+    ];
+  };
+}

modules/features/prusa-slicer/default.nix

@@ -0,0 +1,8 @@
+{...}: {
+  # PrusaSlicer package only; printer and filament profiles remain per-user.
+  flake.nixosModules.prusa-slicer = {pkgs, ...}: {
+    environment.systemPackages = with pkgs; [
+      prusa-slicer
+    ];
+  };
+}