feat: add mml from backend

internal/service/recognition_service.go

@@ -180,6 +180,7 @@ func (s *RecognitionService) GetFormualTask(ctx context.Context, taskNo string)
 		Latex:    taskRet.Latex,
 		Markdown: markdown,
 		MathML:   taskRet.MathML,
+		MML:      taskRet.MML,
 		Status:   int(task.Status),
 	}, nil
 }
@@ -544,6 +545,7 @@ func (s *RecognitionService) processFormulaTask(ctx context.Context, taskID int6
 		Latex:    ocrResp.Latex,
 		Markdown: ocrResp.Markdown,
 		MathML:   ocrResp.MathML,
+		MML:      ocrResp.MML,
 	})
 	if err != nil {
 		log.Error(ctx, "func", "processFormulaTask", "msg", "保存任务结果失败", "error", err)