fix: auto-installer works fully offline

installer/artifacts.nix

@@ -18,14 +18,8 @@ let
     hostName:
     let
       targetConfig = self.nixosConfigurations.${hostName}.config;
-      targetSystem = targetConfig.system.build.toplevel;
+      targetSystemBuild = targetConfig.system.build;
       diskoScript = targetConfig.system.build.diskoScript;
-      
-      # Build the closure export at build time (not runtime in ISO)
-      closureExport = pkgs.runCommand "closure-export-${hostName}" { } ''
-        mkdir -p $out
-        ${pkgs.nix}/bin/nix-store --export $(${pkgs.nix}/bin/nix-store -qR ${targetSystem}) > $out/closure.nar
-      '';
     in
     nixpkgs.lib.nixosSystem {
       inherit system;
@@ -33,9 +27,8 @@ let
         inherit
           inputs
           hostName
-          targetSystem
+          targetSystemBuild
           diskoScript
-          closureExport
           ;
         hostPlatform = system;
       };