增加性接口，修复登录错误

service/checkin.go

@@ -71,3 +71,6 @@ func (c CheckinService) GetUserActivity(aw *app.Wrapper) app.Result {
 	}
 	return aw.Success(checkinDAO.FindUserActivityByID(id))
 }
+func (c CheckinService) GetMyActivitiesToday(aw *app.Wrapper) app.Result {
+	return aw.Success(checkinDAO.FindUserActivitiesToday(aw.ExtractUserClaims().UserID, time.Now().Format("20060102")))
+}