feat(nixos): add common nixos profile; move hostspec config

modules/configurations/nixos.nix

@@ -20,7 +20,10 @@ let
       value = lib.nixosSystem {
         specialArgs = { inherit inputs hostName; };
         #TODO: add profiles system
-        modules = [ value.extraCfg or { } ];
+        modules = [
+          config.flake.profiles.nixos.common
+          (value.extraCfg or { })
+        ] ++ (value.profiles or [ ]);
       };
     };
 in

modules/hostSpec.nix

@@ -1,17 +1,9 @@
-{ config, ... }:
 {
-  flake.hostSpec.hosts = {
-    "nixos/test".extraCfg = {
-      imports = with config.flake.modules.nixos; [ networking ];
-      config = {
-        boot.loader.systemd-boot.enable = true;
-        fileSystems."/" = {
-          device = "/dev/sda1";
-          fsType = "ext4";
-        };
-        nixpkgs.hostPlatform = "x86_64-linux";
-        system.stateVersion = "25.05";
-      };
+  flake.hostSpec.hosts."nixos/test".extraCfg = {
+    fileSystems."/" = {
+      device = "/dev/sda1";
+      fsType = "ext4";
     };
+    nixpkgs.hostPlatform = "x86_64-linux";
   };
 }

modules/profiles/nixos/common.nix

@@ -0,0 +1,9 @@
+{
+  flake.profiles.nixos.common =
+    { hostName, ... }:
+    {
+      boot.loader.systemd-boot.enable = true;
+      system.stateVersion = "25.05";
+      networking = { inherit hostName; };
+    };
+}