Add comfyui package with CUDA-enabled torch

pkgs/default.nix

@@ -4,6 +4,7 @@
 let
   self = {
     audiveris = pkgs.callPackage ./audiveris { };
+    comfyui = pkgs.callPackage ./comfyui { };
     dolos = pkgs.callPackage ./dolos { nodejs = pkgs.nodejs_22; };
     eqc = pkgs.callPackage ./eqc { };
     example-a = pkgs.callPackage ./example-a { };