Resolve VSN-2228 "Feature/auto-assign created contracts and establishments in forms"
- Modify createContract and createEstablishment stores to return created entity
- Add CreatedContract and CreatedEstablishment interfaces in modals
- Update contract and establishment forms to pass created entity via onClose
- Implement auto-assignment logic in circuit and usager forms after entity creation
- Reload options and auto-select newly created contract/establishment when added via
popup
Closes VSN-2228