Update hf_demo.py

hf_demo.py

@@ -1,6 +1,7 @@
 # hf_demo.py – ARF v4 API with Gradio frontend (optional)
 import logging
 import uuid
+import os
 from datetime import datetime, timezone
 from typing import Dict, Any, Optional
 
@@ -218,4 +219,11 @@ with gr.Blocks(title="ARF v4 Demo") as demo:
     history_btn.click(fn=lambda: decision_history[-10:], outputs=decision_output)
 
 # Mount Gradio app at the root path
-app = gr.mount_gradio_app(app, demo, path="/")
+app = gr.mount_gradio_app(app, demo, path="/")
+
+# ========================= ENTRY POINT =========================
+# This ensures the server starts and stays alive when the script is run directly.
+if __name__ == "__main__":
+    import uvicorn
+    port = int(os.environ.get("PORT", 7860))
+    uvicorn.run(app, host="0.0.0.0", port=port)