refactor: 优化 MsgInHandler 函数，改进消息处理逻辑以支持多条文本消息的触发器匹配，增强代码的灵活性和可读性

handler/handler.go

@@ -131,14 +131,16 @@ func MsgInHandler(msg model.Message) (reply *model.Reply) {
 				return nil
 			}
 			for trigger, handler := range atHandlers {
-				if len(msg.StructuredMsg) > 1 {
-					if textMsg, ok := msg.StructuredMsg[1].(*qq_message.TextMessage); ok && strings.Split(textMsg.Data.Text, " ")[0] == trigger {
+				for _, textMsg := range msg.StructuredMsg {
+					if textMsg.GetMessageType() == qq_message.TypeText {
+						if util.SplitN(textMsg.(*qq_message.TextMessage).Data.Text, 2)[0] == trigger {
 							return auth.TryExecHandler(msg, handler.Level, handler.Handler)
 						}
 					}
 				}
 			}
 		}
+	}
 	for trigger, handler := range frontMatchHandlers {
 		if strings.HasPrefix(msg.RawMsg, trigger) {
 			return auth.TryExecHandler(msg, handler.Level, handler.Handler)