some refactoring and modularizing locale

modules/nixos/hardware/network/default.nix

@@ -0,0 +1,62 @@
+{
+  config,
+  lib,
+  ...
+}: let
+  inherit (lib) mkIf mkEnableOption mkOption types;
+  cfg = config.nixos.hardware.network;
+in {
+  options = {
+    nixos = {
+      hardware = {
+        network = {
+          enable = mkEnableOption "Enable the custom networking module";
+
+          hostName = mkOption {
+            type = types.str;
+            default = "default-hostname";
+            description = "Hostname for the nixos.";
+          };
+
+          interfaces = mkOption {
+            type = types.attrsOf (types.submodule {
+              options = {
+                allowedTCPPorts = mkOption {
+                  type = types.listOf types.int;
+                  default = [];
+                  description = "List of allowed TCP ports for this interface.";
+                };
+              };
+            });
+            default = {};
+            description = "Network interface configurations.";
+          };
+          nm-applet = {
+            enable = mkEnableOption "Enables the nm-applet service.";
+            indicator = mkOption {
+              type = types.bool;
+              default = false;
+              description = "Enables the nm-applet indicator.";
+            };
+          };
+        };
+      };
+    };
+  };
+
+  config = mkIf cfg.enable {
+    networking = {
+      networkmanager.enable = true;
+      inherit (cfg) hostName;
+      nftables.enable = true;
+      firewall = {
+        enable = true;
+        inherit (cfg) interfaces;
+      };
+    };
+    programs.nm-applet = {
+      enable = cfg.nm-applet.enable;
+      indicator = cfg.nm-applet.indicator;
+    };
+  };
+}