fix: 优化绑定SS功能，增加输入长度检查以提供更友好的提示信息

handler/scoresaber/score.go

@@ -261,12 +261,19 @@ func getMySSPic(msg model.Message) (reply *model.Reply) {
 }
 
 func bindSS(msg model.Message) (reply *model.Reply) {
+	if len(msg.RawMsg) > len("绑定ss ") {
 		return &model.Reply{
 			ReplyMsg:       scoresaber.SSQuery.BindSS(strconv.Itoa(int(msg.UserId)), msg.RawMsg[len("绑定ss "):]),
 			ReferOriginMsg: true,
 			FromMsg:        msg,
 		}
 	}
+	return &model.Reply{
+		ReplyMsg:       "请输入您的scoresaber主页链接的末尾数字部分",
+		ReferOriginMsg: true,
+		FromMsg:        msg,
+	}
+}
 
 func unbindSS(msg model.Message) (reply *model.Reply) {
 	return &model.Reply{