Add ATM open-offset toggle default off.

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

backend/app/strategy/engine.py

@@ -52,6 +52,9 @@ class StrategyEngine:
         min_opt_lev = self.ledger.get_setting_float(
             "min_option_leverage", s.min_option_leverage
         )
+        atm_off_on = self.ledger.get_setting_bool(
+            "atm_open_offset_enabled", s.atm_open_offset_enabled
+        )
         max_atm_off = self.ledger.get_setting_float(
             "max_atm_open_offset", s.max_atm_open_offset
         )
@@ -80,6 +83,7 @@ class StrategyEngine:
             "leverage": leverage,
             "min_option_hours": min_hours,
             "min_option_leverage": min_opt_lev,
+            "atm_open_offset_enabled": atm_off_on,
             "max_atm_open_offset": max_atm_off,
             "can_open": allow_open,
             "last_error": last_error,
@@ -310,7 +314,7 @@ class StrategyEngine:
         pick = await get_session().pick_for_open_async()
         if pick is None:
             self._set_state(
-                last_error="无合格期权：需剩余时长、ATM开仓偏差与杠杆同时满足"
+                last_error="无合格期权：需剩余时长、杠杆（及已开启的ATM偏差）同时满足"
             )
             return