fix: 复合主键表 shop_players 的 update 改用原生 SQL

ent 的 Update().Where() 对复合主键表会报 "sql/sqlgraph: invalid composite id for update table"，这是 ent 框架已知的限制（field.ID 复合主键仅对 edge schema 完整支持）。同表的 Create/Delete/Query 操作不受影响，仅 Update 需要绕过。在 ServiceContext 中暴露底层 *sql.DB 以供 ExecContext 执行原生 SQL。

app/shop/rpc/internal/logic/updateShopPlayersLogic.go

@@ -3,8 +3,6 @@ package logic
 import (
 	"context"
 	"errors"
-	"juwan-backend/app/shop/rpc/internal/models/predicate"
-	"juwan-backend/app/shop/rpc/internal/models/shopplayers"
 	"time"
 
 	"juwan-backend/app/shop/rpc/internal/svc"
@@ -32,25 +30,28 @@ func (l *UpdateShopPlayersLogic) UpdateShopPlayers(in *pb.UpdateShopPlayersReq)
 		return nil, errors.New("invalid shop_id or player_id")
 	}
 
-	preds := []predicate.ShopPlayers{
-		shopplayers.ShopIDEQ(in.ShopId),
-		shopplayers.PlayerIDEQ(in.PlayerId),
-	}
-
-	updater := l.svcCtx.ShopModelRW.ShopPlayers.Update().
-		Where(shopplayers.And(preds...)).
-		SetIsPrimary(in.IsPrimary)
+	// ent 的 Update().Where() 不支持复合主键表（shop_players 的主键是 (shop_id, player_id)），
+	// 会报 "sql/sqlgraph: invalid composite id for update table"。
+	// Create/Delete/Query 不受影响，仅 Update 需要走原生 SQL。
+	query := `UPDATE shop_players SET is_primary = $1, left_at = $2 WHERE shop_id = $3 AND player_id = $4`
 
+	var leftAt *time.Time
 	if in.LeftAt > 0 {
 		t := time.Unix(in.LeftAt, 0)
-		updater = updater.SetLeftAt(t)
+		leftAt = &t
 	}
 
-	affected, err := updater.Save(l.ctx)
+	result, err := l.svcCtx.DBRW.ExecContext(l.ctx, query, in.IsPrimary, leftAt, in.ShopId, in.PlayerId)
 	if err != nil {
 		logx.Errorf("update shop players failed, %s", err.Error())
 		return nil, errors.New("update shop players failed")
 	}
+
+	affected, err := result.RowsAffected()
+	if err != nil {
+		logx.Errorf("get rows affected failed, %s", err.Error())
+		return nil, errors.New("update shop players failed")
+	}
 	if affected == 0 {
 		return nil, errors.New("shop player not found")
 	}