Fix position flicker, drop futures cooloff, prioritize startup display.

Preserve trading state when CTP memory is empty, bootstrap equity/positions on page load, stabilize risk status from DB monitors, and remove app-layer manual close cooling periods.

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

ctp_trading_state.py

@@ -226,6 +226,7 @@ class CtpTradingState:
         *,
         trades: Optional[list[dict[str, Any]]] = None,
         ths_for_vnpy_sym: Optional[Callable[[str, str], str]] = None,
+        preserve_positions_if_margin: float = 0.0,
     ) -> None:
         """全量校准：以 vnpy 内存为准重建订单/持仓簿。"""
         self.begin_sync()
@@ -256,6 +257,9 @@ class CtpTradingState:
             new_positions[pk] = reconcile_position_avg(
                 old, row, tick, trades=trades, ths_sym=ths,
             )
+        if not new_positions and self._positions and preserve_positions_if_margin > 0:
+            with self._lock:
+                new_positions = {k: dict(v) for k, v in self._positions.items()}
         with self._lock:
             self._orders = new_orders
             self._positions = new_positions