fix(hub): live market PnL and Gate drag SL place

Parse Gate unrealised_pnl in agent; refresh hub market floating PnL from board and trends; clamp Gate TP/SL triggers before place.

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

manual_trading_hub/static/app.js

@@ -1377,6 +1377,10 @@
       });
     });
     const upnl = resolveTrendFloatingPnl(pos, trendPlan);
+    const planMargin =
+      trendPlan && trendPlan.plan_margin_capital != null
+        ? num(trendPlan.plan_margin_capital)
+        : null;
     return {
       exchange_id: exchangeId || null,
       symbol: (pos.symbol || "").trim(),
@@ -1389,6 +1393,7 @@
       contracts: num(pos.contracts),
       unrealized_pnl: upnl != null ? Number(upnl) : null,
       notional_usdt: num(pos.notional_usdt),
+      plan_margin: planMargin,
       orders: orders,
     };
   }