Fix empty recommend list and CTP premarket auto-connect.

Correct main_code order in product refresh, refresh on CTP connect, and limit reconnect to trading or premarket windows.

Co-authored-by: Cursor <cursoragent@cursor.com>

install_trading.py

@@ -122,6 +122,7 @@ from vnpy_bridge import (
     get_bridge,
     set_position_refresh_callback,
     set_tick_sl_tp_callback,
+    set_ctp_connected_callback,
 )
 
 
@@ -1587,6 +1588,7 @@ def install_trading(app, *, login_required, require_nav, get_db, get_setting, se
             lambda: _push_position_snapshot_async(fast=True)
         )
         set_tick_sl_tp_callback(_on_tick_sl_tp)
+        set_ctp_connected_callback(_on_ctp_connected)
 
         def _warm() -> None:
             try:
@@ -1608,6 +1610,11 @@ def install_trading(app, *, login_required, require_nav, get_db, get_setting, se
         except Exception as exc:
             logger.debug("bootstrap ctp connect: %s", exc)
 
+    def _on_ctp_connected(mode: str) -> None:
+        if mode != get_trading_mode(get_setting):
+            return
+        _schedule_recommend_refresh()
+
     @app.route("/trade")
     @login_required
     def trade_page():