refactor: 重构消息类型的初始化逻辑，新增各消息类型的构造函数以提高代码可读性和可维护性

message/record.go

@@ -24,10 +24,14 @@ type RecordMessageData struct {
 
 func init() {
 	RegisterMessageType(TypeRecord, func() CQMessage {
-		return &RecordMessage{Type: TypeRecord}
+		return NewRecordMessage()
 	})
 }
 
+func NewRecordMessage() *RecordMessage {
+	return &RecordMessage{Type: TypeRecord}
+}
+
 func (msg *RecordMessage) SetData(data json.RawMessage) error {
 	return json.Unmarshal(data, &msg.Data)
 }