refactor(networking): split networking into modules

system/modules/networking/default.nix

@@ -0,0 +1,30 @@
+{ lib, config, ... }:
+
+let
+  cfg = config.systemModules.networking;
+  inherit (lib) mkIf mkEnableOption;
+in
+
+{
+  imports = [
+    ./firewall
+    ./tools
+    ./ssh
+    ./tcp
+    ./resolved
+  ];
+
+  options.systemModule.networking.enable = mkEnableOption "Enable networking system module";
+
+  config = mkIf cfg.enable {
+    networking.networkmanager = {
+      enable = true;
+      dns = "systemd-resolved";
+    };
+
+    systemd = {
+      network.wait-online.enable = false;
+      services.NetworkManager-wait-online.enable = false;
+    };
+  };
+}