Fix on_startup removed from Starlette (not supported in current version)

app.py

@@ -525,14 +525,13 @@ async def handle_health(request: Request):
     return Response(status, media_type="text/plain")
 
 
-app = Starlette(
-    routes=[
+app = Starlette(routes=[
         Route("/sse", endpoint=handle_sse),
         Route("/health", endpoint=handle_health),
         Mount("/messages/", app=sse.handle_post_message),
-    ],
-    on_startup=[bm.init],
-)
+    ])
 
 if __name__ == "__main__":
+    import asyncio, threading
+    threading.Thread(target=lambda: asyncio.run(bm.init()), daemon=True).start()
     uvicorn.run(app, host="0.0.0.0", port=7860)