增加功能：设置只有管理员才可以设置

shell/Commands/System/SettingsCommand.cs

@@ -5,6 +5,13 @@ namespace CMLeonOS.Commands
 {
     public static class SettingsCommand
     {
+        private static UserSystem userSystem;
+
+        public static void SetUserSystem(UserSystem system)
+        {
+            userSystem = system;
+        }
+
         public static void ProcessSettings(string args)
         {
             if (string.IsNullOrWhiteSpace(args))
@@ -13,6 +20,12 @@ namespace CMLeonOS.Commands
                 return;
             }
 
+            if (userSystem == null || userSystem.CurrentLoggedInUser == null || !userSystem.CurrentLoggedInUser.IsAdmin)
+            {
+                Console.WriteLine("Error: Only administrators can change settings.");
+                return;
+            }
+
             string[] parts = args.Split(new char[] { ' ' }, 2, StringSplitOptions.RemoveEmptyEntries);
             
             if (parts.Length == 1)

shell/Shell.cs

@@ -59,6 +59,7 @@ namespace CMLeonOS
             envManager = EnvironmentVariableManager.Instance;
             
             Commands.AliasCommand.LoadAliases();
+            Commands.SettingsCommand.SetUserSystem(userSystem);
             
             User currentUser = userSystem.CurrentLoggedInUser;
             if (currentUser != null && !string.IsNullOrWhiteSpace(currentUser.Username))