more cleanup

modules/nixos/monitoring/default.nix

@@ -0,0 +1,53 @@
+{
+  config,
+  lib,
+  pkgs,
+  namespace,
+  ...
+}:
+let
+  cfg = config.${namespace}.monitoring;
+in
+{
+  options.${namespace}.monitoring = {
+    enable = lib.mkEnableOption "Common monitoring and system tools";
+
+    includeNetworkTools = lib.mkOption {
+      type = lib.types.bool;
+      default = true;
+      description = "Include network monitoring tools";
+    };
+
+    includePerformanceTools = lib.mkOption {
+      type = lib.types.bool;
+      default = true;
+      description = "Include performance monitoring tools";
+    };
+  };
+
+  config = lib.mkIf cfg.enable {
+    environment.systemPackages =
+      with pkgs;
+      [
+        # Basic system monitoring
+        htop
+
+      ]
+      ++ lib.optionals cfg.includePerformanceTools [
+        glances
+        nmon
+        iotop
+
+      ]
+      ++ lib.optionals cfg.includeNetworkTools [
+        speedtest-cli
+        iftop
+        nethogs
+        tcpdump
+        wireshark-cli
+      ];
+
+    # Enable common system services for monitoring
+    programs.screen.enable = lib.mkDefault true;
+  };
+}