refactor: generate kubeadm host configs from flake

nixos/kubeadm/flake.nix

@@ -8,19 +8,31 @@
   outputs = { nixpkgs, ... }:
     let
       system = "x86_64-linux";
-      mkHost = hostModules:
+      lib = nixpkgs.lib;
+
+      mkNode = { name, role }:
+        let
+          roleModule = if role == "control-plane" then ./modules/k8s-control-plane.nix else ./modules/k8s-worker.nix;
+          hardwarePath = ./hosts/hardware + "/${name}.nix";
+        in
         nixpkgs.lib.nixosSystem {
           inherit system;
-          modules = hostModules;
+          modules = [
+            ./modules/k8s-cluster-settings.nix
+            ./modules/k8s-common.nix
+            roleModule
+            ({ lib, ... }: {
+              imports = lib.optional (builtins.pathExists hardwarePath) hardwarePath;
+              networking.hostName = name;
+              system.stateVersion = "25.05";
+            })
+          ];
         };
     in {
-      nixosConfigurations = {
-        cp-1 = mkHost [ ./hosts/cp-1.nix ];
-        cp-2 = mkHost [ ./hosts/cp-2.nix ];
-        cp-3 = mkHost [ ./hosts/cp-3.nix ];
-        wk-1 = mkHost [ ./hosts/wk-1.nix ];
-        wk-2 = mkHost [ ./hosts/wk-2.nix ];
-        wk-3 = mkHost [ ./hosts/wk-3.nix ];
-      };
+      nixosConfigurations = lib.genAttrs [ "cp-1" "cp-2" "cp-3" "wk-1" "wk-2" "wk-3" ] (name:
+        mkNode {
+          inherit name;
+          role = if lib.hasPrefix "cp-" name then "control-plane" else "worker";
+        });
     };
 }