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/location.go

@@ -21,10 +21,14 @@ type LocationMessageData struct {
 
 func init() {
 	RegisterMessageType(TypeLocation, func() CQMessage {
-		return &LocationMessage{Type: TypeLocation}
+		return NewLocationMessage()
 	})
 }
 
+func NewLocationMessage() *LocationMessage {
+	return &LocationMessage{Type: TypeLocation}
+}
+
 func (msg *LocationMessage) SetData(data json.RawMessage) error {
 	return json.Unmarshal(data, &msg.Data)
 }