fix proxy config

Caddyfile

@@ -1,7 +1,11 @@
 :7860
 
 handle_path /openclaw/* {
-    reverse_proxy 127.0.0.1:18791
+    reverse_proxy 127.0.0.1:18791 127.0.0.1:18789 {
+        lb_policy first
+        lb_try_duration 30s
+        lb_try_interval 500ms
+    }
 }
 
 handle {

app.py

@@ -572,12 +572,12 @@ with std_ui_status_col:
 
 with std_ui_embed_col:
     public_ui_url = with_token(OPENCLAW_STANDARD_UI_PUBLIC_URL, gateway_token)
-    if public_ui_url:
+    if public_ui_url and proxy_ok:
         st.caption(f"Embedded URL: {mask_token_in_url(public_ui_url)}")
         components.iframe(public_ui_url, height=560, scrolling=True)
         st.markdown(f"[Open Standard UI]({public_ui_url})")
     else:
-        st.info("Standard UI is not reachable yet. Start gateway and refresh.")
+        st.info("Standard UI proxy is not ready yet. Wait 10-30s and refresh.")
 
 st.divider()