Fix OKX spot swap tgtCcy and show options trading USDT in header.

OKX requires quote_ccy/base_ccy for market orders; include trading_usdt in balance display and total funds.

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

lib/exchange/okx_options_lib.py

@@ -446,8 +446,8 @@ def options_header_balances(
     ex: ccxt.okx,
     *,
     force: bool = False,
-) -> tuple[float | None, float | None, float | None]:
-    """顶栏三格:交易 USDC,资金 USDC,资金 USDT(单次拉取 + 缓存)."""
+) -> tuple[float | None, float | None, float | None, float | None]:
+    """顶栏四格:交易 USDC/USDT,资金 USDC/USDT(单次拉取 + 缓存)."""
     bal = fetch_options_balances(ex, force=force)
 
     def _round(v: Any) -> float | None:
@@ -462,6 +462,7 @@ def options_header_balances(
         _round(bal.get("trading_usdc")),
         _round(bal.get("funding_usdc")),
         _round(bal.get("funding_usdt")),
+        _round(bal.get("trading_usdt")),
     )
 
 
@@ -1110,7 +1111,7 @@ def spot_market_swap_usdt_usdc(
                 "side": "buy",
                 "ordType": "market",
                 "sz": str(amount),
-                "tgtCcy": "quote",
+                "tgtCcy": "quote_ccy",
             }
         elif d == "usdc_to_usdt":
             body = {
@@ -1119,7 +1120,7 @@ def spot_market_swap_usdt_usdc(
                 "side": "sell",
                 "ordType": "market",
                 "sz": str(amount),
-                "tgtCcy": "base",
+                "tgtCcy": "base_ccy",
             }
         else:
             return {"ok": False, "msg": "direction 须为 usdt_to_usdc 或 usdc_to_usdt"}