Support LIVE exchange funds and perp margin mode.

Hide sim equity when LIVE is selected; OKX funds bar uses exchange balances; add cross/isolated for perp only (options stay cash).

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

backend/app/config.py

@@ -68,6 +68,8 @@ class Settings(BaseSettings):
     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
+    # 永续保证金模式：cross=全仓（默认）| isolated=逐仓；期权仍固定 cash（OKX 逐仓/现金）
+    perp_margin_mode: str = "cross"
     min_option_hours: float = 12.0  # 期权最小剩余小时
     min_option_leverage: float = 100.0  # 现价/卖一权利金 下限
     atm_open_offset_enabled: bool = False  # 开仓 ATM 偏差限制开关（默认关）