feat(runtime): add lightweight self-ping keepalive thread to prevent idle shutdowns

app.py

@@ -847,9 +847,23 @@ if __name__ == "__main__":
         "show_error": True,  # Show detailed errors for debugging
         "quiet": False,  # Show startup messages
         "show_api": True,  # Enable API documentation
-        "ssr_mode": False,  # Disable experimental SSR in Docker env
-        "server_kwargs": {"timeout_keep_alive": 120}
+        "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