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>

vnpy_bridge.py

@@ -553,11 +553,20 @@ class CtpBridge:
                 orders = self.list_active_orders()
                 positions = self._collect_positions()
                 trades = self.list_trades()
+            preserve_margin = 0.0
+            if self._connected_mode and not positions:
+                try:
+                    preserve_margin = float(
+                        ctp_account_margin_used(self._connected_mode) or 0,
+                    )
+                except Exception:
+                    preserve_margin = 0.0
             trading_state.calibrate_from_lists(
                 orders,
                 positions,
                 trades=trades,
                 ths_for_vnpy_sym=lambda s, e: CtpBridge._vnpy_sym_to_ths(s, e) or s,
+                preserve_positions_if_margin=preserve_margin,
             )
         except Exception as exc:
             logger.debug("calibrate trading state: %s", exc)