Add HEDGE_PO_MODE instance modes with shared sim/live path.

Lock one mode per instance/subaccount, cross-asset BTC option/ETH perp sizing, combo-U exit, and ship docs/tests/audit.

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

lib/env/env_ui_manifest.py

@@ -279,10 +279,20 @@ _HEDGE_COMMON_FIELDS: list[tuple[str, str, str]] = [
 ]
 
 _HEDGE_PO_FIELDS: list[tuple[str, str, str]] = [
+    (
+        "HEDGE_PO_MODE",
+        "永期实例模式",
+        "eth/btc/btc_eth;一实例一种模式对应一个子账户;模拟与实盘同路径;改后须重启",
+    ),
+    (
+        "HEDGE_CROSS_NOTIONAL_K",
+        "跨币永续名义系数",
+        "仅 btc_eth;默认 0.5=永续名义为期权名义一半;改后须重启",
+    ),
     (
         "HEDGE_PLAN_OPTION_PRIMARY",
         "永期模式(以期权为主/保险)",
-        "默认 true=以期权为主;false=保险模式;页面标题前显示标识,不可在页内切换",
+        "实例模式强制以期权为主;一般保持 true",
     ),
     ("HEDGE_PLAN_OPEN_ORDER", "永期开仓顺序", "options_first 或 perp_first"),
     ("HEDGE_PLAN_ON_PERP_SL_CLOSE_OPTIONS", "永期止损后强制平期权", "保护机制,建议保持 true"),
@@ -364,6 +374,8 @@ _RUNTIME_ENV_DEFAULTS: dict[str, str] = {
     "HEDGE_PLAN_OO_BIAS_RATIO": "0.7",
     "HEDGE_PLAN_BUDGET_BUFFER": "0.95",
     "HEDGE_PLAN_OPTION_PRIMARY": "true",
+    "HEDGE_PO_MODE": "eth",
+    "HEDGE_CROSS_NOTIONAL_K": "0.5",
     "HEDGE_PLAN_OPTIONS_MUTUAL_EXCLUSIVE": "true",
     "HEDGE_PLAN_MANUAL_COMPLETE_ON_PARTIAL": "true",
     "OKX_OPTIONS_CLOSE_GATE_MODE": "premium",