refactor(networking): split networking into modules

system/modules/networking/tools/default.nix

@@ -0,0 +1,18 @@
+{ lib, config, pkgs, ... }:
+
+let
+  cfg = config.systemModules.networking;
+  inherit (lib) mkIf mkEnableOption;
+in
+
+{
+  options.systemModules.networking.tools = mkEnableOption "Enable networking tools";
+
+  config = mkIf cfg.tools {
+    environment.systemPackages = with pkgs; [
+      traceroute
+      mtr
+      tcpdump
+    ];
+  };
+}