Auto-reconnect CTP with new front-end addresses after saving settings

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

vnpy_bridge.py

@@ -546,6 +546,13 @@ class CtpBridge:
     def mark_disconnected(self) -> None:
         self._connected_mode = None
 
+    def reconnect_after_settings_saved(self, mode: str) -> dict[str, Any]:
+        """保存前置/账号后关闭旧连接，并用数据库中的新配置重连。"""
+        self._close_gateway()
+        self._last_error = ""
+        _persist_last_error("")
+        return self.start_connect_async(mode, force=True)
+
     def _schedule_fee_sync(self, mode: str) -> None:
         """连接成功后触发每日同步检查（非每次全量）。"""