set listen flag to listen on all if specifed

comfy/cli_args.py

@@ -2,7 +2,7 @@ import argparse
 
 parser = argparse.ArgumentParser()
 
-parser.add_argument("--listen", type=str, default="127.0.0.1", help="Listen on IP or 127.0.0.1 if none given so the UI can be accessed from other computers.")
+parser.add_argument("--listen", nargs="?", const="0.0.0.0", default="127.0.0.1", type=str, help="Specify the IP address to listen on (default: 127.0.0.1). If --listen is provided without an argument, it defaults to 0.0.0.0. (listens on all)")
 parser.add_argument("--port", type=int, default=8188, help="Set the listen port.")
 parser.add_argument("--extra-model-paths-config", type=str, default=None, help="Load an extra_model_paths.yaml file.")
 parser.add_argument("--output-directory", type=str, default=None, help="Set the ComfyUI output directory.")