Expose sim/live matching mode in env config UI.

Saving SIM_DEFAULT_MODE also switches runtime trading.mode immediately.

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

lib/env/env_schema.py

@@ -99,6 +99,7 @@ HOT_RELOAD_EXACT = frozenset({
     "OKX_OPTIONS_TRADE_BUDGET_USDC",
     "OKX_OPTIONS_BUDGET_BUFFER",
     "OKX_TRADE_MODE",
+    "SIM_DEFAULT_MODE",
     "MAX_ACTIVE_HEDGE_PLANS",
     "HEDGE_PLAN_LIVE_ORDER",
     "HEDGE_PLAN_OPTION_PRIMARY",
@@ -159,6 +160,10 @@ SELECT_OPTIONS: dict[str, tuple[tuple[str, str], ...]] = {
         ("perp_options", "永期对冲"),
         ("options_options", "期期对冲"),
     ),
+    "SIM_DEFAULT_MODE": (
+        ("sim", "模拟(sim)"),
+        ("live", "实盘(live)"),
+    ),
     "HEDGE_PLAN_OPTION_PRIMARY": (
         ("true", "以期权为主"),
         ("false", "保险模式"),