stabilize async loops

backend/src/server.py

@@ -6,7 +6,6 @@ from quart_auth import (
 import time
 import json
 import asyncio
-import nest_asyncio
 import traceback
 from stream import Stream
 from tool import ToolSpec, ToolParameter
@@ -27,8 +26,6 @@ def encode_json(value):
     return json.dumps(value, default=encode_unknown)
 
 async def start_server(app):
-    nest_asyncio.apply()
-
     server = Quart(__name__, static_folder=frontend_path)
     server.secret_key = 'horde-secret'
     auth_manager = QuartAuth(server, mode="bearer")