add nest asyncio

app.py

@@ -1,3 +1,7 @@
+# Enable nested event loops for Gradio + asyncio compatibility
+import nest_asyncio
+nest_asyncio.apply()
+
 import gradio as gr
 from typing import List, Optional, Tuple, Dict, Any
 import uuid

requirements.txt

@@ -1,5 +1,6 @@
 # This file was autogenerated by uv via the following command:
 #    uv export --no-hashes --no-dev -o app/requirements.txt
+nest_asyncio
 aiofiles==24.1.0
     # via gradio
 aiohappyeyeballs==2.6.1