```

feat(item_buy): 优化购买逻辑并添加库存限制功能

- 将变量名 is 改为 ok，提高代码可读性
- 移除未使用的变量 addSuccess
- 重构购买成功逻辑，确保物品添加成功后才扣减金币
- 在 talk.go 中修改判断条件，使用 Limit 字段而非 Type 字段
- 在 user_talk.go 中添加 Limit 字段用于限制数量配置
```

logic/controller/item_buy.go

@@ -99,8 +99,8 @@ func (h Controller) BuyGoldItem(data *item.C2S_GOLD_BUY_PRODUCT, player *player.
 	}
 	config := service.NewTalkConfigService().GetCache(int(data.ProductID))
 	if config != nil {
-		_, is := player.Service.Talk.Cheak(0, int(data.ProductID))
-		if !is {
+		_, ok := player.Service.Talk.Cheak(0, int(data.ProductID))
+		if !ok {
 			return nil, errorcode.ErrorCodes.ErrExceedStock
 		}
 	}
@@ -115,7 +115,7 @@ func (h Controller) BuyGoldItem(data *item.C2S_GOLD_BUY_PRODUCT, player *player.
 	// }
 
 	var usegold uint64
-	var addSuccess bool
+
 	switch data.Type {
 	case 0:
 		if pro.SeerdouPrice == 0 {
@@ -139,28 +139,30 @@ func (h Controller) BuyGoldItem(data *item.C2S_GOLD_BUY_PRODUCT, player *player.
 
 	}
 
-	addSuccess = player.ItemAdd(pro.ProductID, data.Count)
-	if addSuccess {
+	switch data.Type {
+	case 0:
 
-		switch data.Type {
-		case 0:
+		if player.ItemAdd(pro.ProductID, data.Count) {
 			player.Info.Coins -= int64(usegold)
-
-		case 1:
-			r := player.Service.Talk.Update(int(pro.ProductID), int(data.Count))
-			if !r {
-				return nil, errorcode.ErrorCodes.ErrGoldBeanSingleLimit
-			}
-			player.User.UpdateGold(player.Info.UserID, -int64(usegold))
-			//购买成功，执行记录
-
 		}
 
-		player.SendPackCmd(1105, item.GoldOnlineRemainOutboundInfo{
-			Coin:       player.Info.Coins,
-			GoldNumber: uint32(player.User.GetGold(uint(player.Info.UserID))),
-		})
+	case 1:
+		r := player.Service.Talk.Update(int(pro.ProductID), int(data.Count))
+		if !r {
+			return nil, errorcode.ErrorCodes.ErrGoldBeanSingleLimit
+		}
+
+		if player.ItemAdd(pro.ProductID, data.Count) {
+			player.User.UpdateGold(player.Info.UserID, -int64(usegold))
+		}
+
+		//购买成功，执行记录
+
 	}
 
+	player.SendPackCmd(1105, item.GoldOnlineRemainOutboundInfo{
+		Coin:       player.Info.Coins,
+		GoldNumber: uint32(player.User.GetGold(uint(player.Info.UserID))),
+	})
 	return nil, -1
 }