fix: OKX 持仓张数优先读 info.pos，滚仓后同步 order_amount

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

lib/strategy/strategy_roll_monitor_lib.py

@@ -418,9 +418,17 @@ def _execute_pending_roll_leg(
         "UPDATE roll_groups SET leg_count=?, current_stop_loss=?, updated_at=? WHERE id=?",
         (filled + 1, sl, _now(cfg), gid),
     )
+    live_qty = qty + float(amount)
+    try:
+        pos2 = cfg["get_position"](ex_sym, direction) or {}
+        q2 = float(pos2.get("contracts") or 0)
+        if q2 > 0:
+            live_qty = q2
+    except Exception:
+        pass
     conn.execute(
-        "UPDATE order_monitors SET stop_loss=? WHERE id=? AND status='active'",
-        (sl, mon["id"]),
+        "UPDATE order_monitors SET stop_loss=?, order_amount=? WHERE id=? AND status='active'",
+        (sl, float(live_qty), mon["id"]),
     )
 
     notify = cfg.get("send_wechat")