fix: 修改多个处理函数的返回类型为指针类型，以提高内存使用效率并避免不必要的拷贝

handler/roll/roll.go

@@ -17,17 +17,17 @@ func init() {
 	handler.RegisterHelpInform("roll [次数]d[面数]", "roll", "掷骰")
 }
 
-func roll(msg model.Message) (reply model.Reply) {
+func roll(msg model.Message) (reply *model.Reply) {
 	act, err := ParseRollExpression(msg.RawMsg)
 	if err != nil {
-		return model.Reply{
+		return &model.Reply{
 			ReplyMsg:       "",
 			ReferOriginMsg: false,
 			FromMsg:        msg,
 		}
 	}
 	result, results := RollDice(act)
-	return model.Reply{
+	return &model.Reply{
 		ReplyMsg:       "掷骰结果: " + strconv.Itoa(result) + "点 " + fmt.Sprint(results),
 		ReferOriginMsg: true,
 		FromMsg:        msg,