[ANABI feedback] Corelare bunuri

Exista situatii in care un bun introdus agregat (o flota de masini) trebuie sa fie "spart" in mai multe bunuri.
Ar fi util sa existe un mod de a corela bunul introdus initial cu mai multe bunuri care sunt introduse la o data ulterioara si care se refera la aceleasi bunuri.
Relatia de corelare tb sa fie si de la parinte la copii, si de la bunul copil la parinte.
Relatia de corelare se face pe baza de id.

The issue names no files, tests, or API entry points. Start by locating the existing bunuri model and its create/read endpoints, then determine how relationships are persisted and exposed in both parent-to-child and child-to-parent directions. Done means a clear, ID-based correlation workflow supports splitting an aggregated asset and retrieving both sides of the relationship.

Written by the indexing model from the issue text.