匹配失败错误码

errors/chat.go

@@ -13,4 +13,5 @@ var (
 	ErrorMatchingFail           = codes.Error(40008, "匹配失败")
 	ErrorIsGetAward             = codes.Error(40009, "已经获取过奖励")
 	ErrorChatRecordNotExist     = codes.Error(40010, "聊天记录不存在")
+	ErrorRandomMatchingFail     = codes.Error(40011, "随机匹配失败")
 )