Apply 200k scope when CTP offline; trailing breakeven order UX.

When SimNow or live CTP is disconnected, default to the four-product whitelist regardless of reference capital. Trailing breakeven defaults off; when enabled hide take-profit and risk-reward, monitor exits via trailing stop only. Document both behaviors in TRADING.md and FEATURES.md.

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

trading_context.py

@@ -91,5 +91,16 @@ def get_account_capital(conn, get_setting: Callable[[str, str], str]) -> float:
         return 0.0
 
 
+def is_ctp_connected(get_setting: Callable[[str, str], str]) -> bool:
+    """当前交易模式（SimNow / 实盘）是否已连接 CTP。"""
+    try:
+        from vnpy_bridge import ctp_status
+
+        mode = get_trading_mode(get_setting)
+        return bool(ctp_status(mode).get("connected"))
+    except Exception:
+        return False
+
+
 def trading_mode_label(get_setting: Callable[[str, str], str]) -> str:
     return "SimNow" if get_trading_mode(get_setting) == TRADING_MODE_SIM else "期货公司实盘"