chore(runtime): remove self-ping keepalive thread per request

app.py

@@ -822,20 +822,5 @@ if __name__ == "__main__":
         "ssr_mode": False  # Disable experimental SSR in Docker env
     }
 
-    # Lightweight keepalive (self-ping) to avoid idle shutdowns
-    try:
-        import threading, time, requests
-        def _keepalive():
-            url = "http://127.0.0.1:7860/"
-            while True:
-                try:
-                    requests.get(url, timeout=3)
-                except Exception:
-                    pass
-                time.sleep(60)
-        threading.Thread(target=_keepalive, daemon=True).start()
-    except Exception:
-        pass
-
     # Enable queue for gradio_client compatibility
     demo.queue().launch(**launch_kwargs)  # ✅ required for gradio_client to work