fix: BG 22002视为已平仓不重试 + 删除STBL

- closeLeg: 22002（暂无仓位可平）→ 标记已平仓，不报错不重试
- closeLeg: 新增holdSide参数传给BG API
- scanner.go: 删除STBL币对

trader.go

@@ -3,6 +3,7 @@ package main
 import (
 	"fmt"
 	"log"
+	"strings"
 	"sync"
 	"time"
 
@@ -1404,9 +1405,15 @@ func (t *Trader) closeLeg(leg *PositionLeg) string {
 		}
 		resp, err := t.bitget.PlaceMarketOrder(side, leg.Coin+"USDT", leg.Size, "close", holdSide)
 		if err != nil {
-			return fmt.Sprintf("BG close 22002: %v", err)
+			// 22002 = no position on exchange (already closed manually or previously)
+			if strings.Contains(err.Error(), "22002") {
+				log.Printf("[Trader] BG %s %s: already closed (22002)", side, leg.Coin+"USDT")
+			} else {
+				return fmt.Sprintf("%v", err)
+			}
+		} else {
+			log.Printf("[ExRes] BG close %s %s: size=%s → response=%s", side, leg.Coin+"USDT", leg.Size, resp)
 		}
-		log.Printf("[ExRes] BG close %s %s: size=%s → response=%s", side, leg.Coin+"USDT", leg.Size, resp)
 	} else {
 		log.Printf("[Order] HL close %s %s | size=%s", side, leg.Coin, leg.Size)
 		resp, err := t.hyperliquid.PlaceMarketOrder(leg.Coin, side, leg.Size)