fix: content in sendSimpleMessage

internal/api/msg.go

@@ -490,6 +490,11 @@ func (m *MessageApi) SendSimpleMessage(c *gin.Context) {
 		return
 	}
 
+	content, err := jsonutil.JsonMarshal(apistruct.MarkdownTextElem{Content: req.Content})
+	if err != nil {
+		apiresp.GinError(c, errs.Wrap(err))
+		return
+	}
 	msgData := &sdkws.MsgData{
 		SendID:           sendID,
 		RecvID:           recvID,
@@ -498,8 +503,8 @@ func (m *MessageApi) SendSimpleMessage(c *gin.Context) {
 		SenderPlatformID: constant.AdminPlatformID,
 		SessionType:      sessionType,
 		MsgFrom:          constant.UserMsgType,
-		ContentType:      constant.Text,
-		Content:          []byte(req.Content),
+		ContentType:      constant.MarkdownText,
+		Content:          content,
 		OfflinePushInfo:  req.OfflinePushInfo,
 		Ex:               req.Ex,
 	}