fix(okx): use OCO algo orders for hub TP/SL to avoid instant close

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

crypto_monitor_okx/app.py

@@ -2610,37 +2610,31 @@ def cancel_okx_swap_open_orders(exchange_symbol):
 
 def _okx_place_tp_sl_orders(exchange_symbol, direction, amount, stop_loss, take_profit):
     """
-    为已有持仓挂条件止盈/止损（算法单）。
-    勿在同一笔 reduce-only 市价单上同时带 stopLoss+takeProfit，OKX/ccxt 可能当成立即全平。
+    为已有持仓挂条件止盈/止损（一笔 OCO 算法单）。
+    勿带 reduceOnly，勿分两笔 reduce-only 市价单，否则 OKX/ccxt 可能当成立即全平。
     """
     ensure_markets_loaded()
     close_side = "sell" if direction == "long" else "buy"
     amt = float(exchange.amount_to_precision(exchange_symbol, float(amount)))
     if amt <= 0:
         raise RuntimeError("止盈止损：可平数量经精度舍入后为 0")
-    base = build_okx_order_params(direction, reduce_only=True)
-    sl_px = float(stop_loss)
-    tp_px = float(take_profit)
+    base = build_okx_order_params(direction, reduce_only=False)
+    sl_px = _okx_algo_trigger_price_str(exchange_symbol, stop_loss)
+    tp_px = _okx_algo_trigger_price_str(exchange_symbol, take_profit)
+    order_params = {
+        **base,
+        "stopLossPrice": float(sl_px),
+        "takeProfitPrice": float(tp_px),
+        "tpOrdPx": "-1",
+        "slOrdPx": "-1",
+    }
+    if OKX_POS_MODE == "hedge":
+        ps = "long" if direction == "long" else "short"
+        order_params["positionSide"] = ps
     last_err = None
     for attempt in range(6):
         try:
-            exchange.create_order(
-                exchange_symbol,
-                "market",
-                close_side,
-                amt,
-                None,
-                {**base, "stopLossPrice": sl_px},
-            )
-            time.sleep(0.05)
-            exchange.create_order(
-                exchange_symbol,
-                "market",
-                close_side,
-                amt,
-                None,
-                {**base, "takeProfitPrice": tp_px},
-            )
+            exchange.create_order(exchange_symbol, "oco", close_side, amt, None, order_params)
             return
         except Exception as e:
             last_err = e