feat(trend): 趋势回调保本移交下单监控并统一写交易记录

保本后结束趋势计划，持仓转入下单监控（备注趋势回调），交易所同时挂保本止损与计划止盈；中控或交易所平仓均经下单监控写入交易记录（trend_plan_id、开仓类型），四所共用 strategy_trend_register。

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

strategy_db.py

@@ -147,6 +147,9 @@ def init_strategy_tables(conn) -> None:
         "ALTER TABLE trend_pullback_preview_snapshots ADD COLUMN outcome TEXT DEFAULT 'open'",
         "ALTER TABLE trend_pullback_preview_snapshots ADD COLUMN executed_plan_id INTEGER",
         "ALTER TABLE trade_records ADD COLUMN trend_plan_id INTEGER",
+        "ALTER TABLE order_monitors ADD COLUMN trend_plan_id INTEGER",
+        "ALTER TABLE order_monitors ADD COLUMN monitor_type TEXT",
+        "ALTER TABLE order_monitors ADD COLUMN key_signal_type TEXT",
     ):
         try:
             conn.execute(ddl)