[choir] Refactor model layer to receive domain object as an input param instead of plain request body

[Gelassen]

Tech description

Changes in DTO objects currently leads to several bugs. The root cause is some project layers work with unprocessed input param from the upper layer and changes in design of this object are not always followed by changes in the rest other places. Follow-up this places, e.g. profile model layer, to work with business domain object instead of raw params from the web request.