Add Noctalia plugins config and disable defaults

Introduce `nooctalia-plugins` options to control nightly‑shell plugins
and make
their activation conditional.  Update host home‑modules to enable a
subset
of plugins (keybind‑cheatsheet, kde‑connect, screenshot, ntfy) on
desktop and
laptop configurations.  Disable numerous default applications and system
services (e.g., Zed, browsers, Docker, Flatpak, calendar, GameMode,
Steam,
media tools, communication apps) in the default host configuration.

modules/home/noctalia/plugins.nix

@@ -1,7 +1,21 @@
-{lib, ...}: let
+{
+  lib,
+  config,
+  ...
+}: let
   sourceUrl = "https://github.com/noctalia-dev/noctalia-plugins";
 in {
-  programs.noctalia-shell = lib.mkForce {
+  options.nooctalia-plugins = {
+    mini-docker.enable = lib.mkEnableOption "Mini docker plugin";
+    timer.enable = lib.mkEnableOption "Timer plugin";
+    keybind-cheatsheet.enable = lib.mkEnableOption "Keybind cheatsheet plugin";
+    kde-connect.enable = lib.mkEnableOption "KDE Connect plugin";
+    screen-recorder.enable = lib.mkEnableOption "Screen-recorder plugin";
+    screenshot.enable = lib.mkEnableOption "Screenshot plugin";
+    ntfy-notifications.enable = lib.mkEnableOption "ntfy notifications plugin";
+  };
+
+  config.programs.noctalia-shell = lib.mkForce {
     plugins = {
       sources = [
         {
@@ -11,31 +25,31 @@ in {
         }
       ];
       states = {
-        mini-docker = {
+        mini-docker = lib.mkIf config.nooctalia-plugins.mini-docker.enable {
           enabled = true;
           sourceUrl = sourceUrl;
         };
-        timer = {
+        timer = lib.mkIf config.nooctalia-plugins.timer.enable {
           enabled = true;
           sourceUrl = sourceUrl;
         };
-        keybind-cheatsheet = {
+        keybind-cheatsheet = lib.mkIf config.nooctalia-plugins.keybind-cheatsheet.enable {
           enabled = true;
           sourceUrl = sourceUrl;
         };
-        kde-connect = {
+        kde-connect = lib.mkIf config.nooctalia-plugins.kde-connect.enable {
           enabled = true;
           sourceUrl = sourceUrl;
         };
-        screen-recorder = {
+        screen-recorder = lib.mkIf config.nooctalia-plugins.screen-recorder.enable {
           enabled = true;
           sourceUrl = sourceUrl;
         };
-        screenshot = {
+        screenshot = lib.mkIf config.nooctalia-plugins.screenshot.enable {
           enabled = true;
           sourceUrl = sourceUrl;
         };
-        ntfy-notifications = {
+        ntfy-notifications = lib.mkIf config.nooctalia-plugins.ntfy-notifications.enable {
           enabled = true;
           sourceUrl = sourceUrl;
         };