refactor: 修改 GetScore 函数以返回当前和历史玩家数据，优化 getMyBL 函数中的结果处理逻辑

handler/beatleader/beatleader.go

@@ -174,8 +174,10 @@ func getMyBL(msg model.Message) (reply *model.Reply) {
 	)
 
 	userIdStr := strconv.Itoa(int(msg.UserId))
+	var data *beatleader.PlayerDataLite
+	var lastData *beatleader.PlayerDataLite
 	for attempts < maxRetries {
-		resultStr, err = beatleader.BLQuery.GetScore(userIdStr)
+		data, lastData, err = beatleader.BLQuery.GetScore(userIdStr)
 		if err == nil {
 			break // 成功时退出循环
 		}
@@ -187,6 +189,11 @@ func getMyBL(msg model.Message) (reply *model.Reply) {
 	if err != nil {
 		resultStr = "获取您的分数时出现问题，请稍后重试。"
 	}
+	if lastData != nil {
+		resultStr = data.LastDiffToString(*lastData)
+	} else {
+		resultStr = data.ToString()
+	}
 
 	return &model.Reply{
 		ReplyMsg:       resultStr,