Add Binance SIM market adapter and exchange switch in settings.

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

backend/app/market/instruments.py

@@ -4,8 +4,8 @@ from __future__ import annotations
 
 from typing import Any
 
+from ..exchange.expiry import expiry_ms_from_ymd
 from ..exchange.okx.parse import (
-    expiry_ms_from_ymd,
     parse_option_inst_id,
     safe_float,
 )