feat: disable myOkx futures support

it's a product that doesn't exist.

freqtrade/exchange/__init__.py

@@ -46,4 +46,4 @@ from freqtrade.exchange.kucoin import Kucoin
 from freqtrade.exchange.lbank import Lbank
 from freqtrade.exchange.luno import Luno
 from freqtrade.exchange.modetrade import Modetrade
-from freqtrade.exchange.okx import Okx
+from freqtrade.exchange.okx import MyOkx, Okx

freqtrade/exchange/common.py

@@ -49,7 +49,6 @@ MAP_EXCHANGE_CHILDCLASS = {
     "binanceje": "binance",
     "binanceusdm": "binance",
     "okex": "okx",
-    "myokx": "okx",
     "okxus": "okx",
     "gateio": "gate",
     "huboi": "htx",
@@ -65,6 +64,7 @@ SUPPORTED_EXCHANGES = [
     "hyperliquid",
     "kraken",
     "okx",
+    "myokx",
 ]
 
 # either the main, or replacement methods (array) is required

freqtrade/exchange/okx.py

@@ -287,3 +287,14 @@ class Okx(Exchange):
         orders_open = self._api.fetch_open_orders(pair, since=since_ms)
         orders.extend(orders_open)
         return orders
+
+
+class MyOkx(Okx):
+    """
+    MyOkx exchange class.
+    Minimal adjustment to disable futures trading for the EU subsidiary of Okx
+    """
+
+    _supported_trading_mode_margin_pairs: list[tuple[TradingMode, MarginMode]] = [
+        (TradingMode.SPOT, MarginMode.NONE),
+    ]