Add Binance live trading, anti-stuck open/close recovery, and configurable rate limits.

OKX/Binance LIVE share half_open and option_closed_perp_pending repair paths; private REST throttles default to 1s and are tunable in settings.

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

backend/app/config.py

@@ -33,7 +33,7 @@ class Settings(BaseSettings):
     okx_ws_public: str = "wss://ws.okx.com:8443/ws/v5/public"
     okx_http_proxy: str = ""
 
-    # 币安私有交易密钥（本期仅落盘；实盘下单后续）
+    # 币安私有交易密钥（LIVE 真下单：fapi 永续 + eapi 期权）
     binance_api_key: str = ""
     binance_api_secret: str = ""
 
@@ -61,6 +61,7 @@ class Settings(BaseSettings):
     net_profit_target: float = 15.0  # fixed_usdt：净盈利 ≥ 该值（USDT）
     premium_exit_multiple: float = 1.0  # premium_multiple：净盈利 ≥ 权利金×倍数
     rest_seconds: int = 300
+    live_order_interval_sec: float = 1.0  # LIVE 私有下单/查单最小间隔（秒）
     skip_weekends: bool = True  # 上海时区周六日禁止新开仓（已有仓仍可平）
     leverage: float = 3.0  # 永续杠杆
     min_option_hours: float = 12.0  # 期权最小剩余小时