Close residual options when premium recovers above configurable threshold.

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

backend/app/config.py

@@ -82,6 +82,9 @@ class Settings(BaseSettings):
     fixed_direction_enabled: bool = False
     fixed_perp_side: str = "long"  # long|short；long→买Put，short→买Call
     close_bid_mark_max_pct: float = 30.0  # 平仓：买一相对标记最大偏差%
+    # 残留期权中途平：当前买一权利金 ≥ 初始权利金 × 该% 才尝试卖出
+    residual_min_premium_pct: float = 20.0
+    residual_close_check_sec: int = 300  # 残留巡检间隔（秒）
     perp_qty_eth: float = 1.0
     option_qty_eth: float = 2.0
     db_path: str = ""  # empty -> backend/data/hedge.db