Lifecycle deletion management for domain/project/user/vfolder/image

Provide a consistent deletion lifecycle (soft delete, graceful deletion, cascade/cleanup semantics) across core entities: domain, project, user, vfolder, and image. Scope and per-entity rules defined by the BEP.\n\nRelated existing work: BA-3709 (Soft Delete and Graceful Deletion for Projects and Resources) — this Epic generalizes beyond projects.

JIRA Issue: BA-7026

Start by locating the BEP referenced in the issue and reviewing BA-3709, which covers soft and graceful deletion for projects and resources. Use those materials to determine the per-entity rules for domain, project, user, vfolder, and image, including cascade and cleanup behavior; done means the BEP-defined lifecycle is consistently implemented across all listed entities.

Written by the indexing model from the issue text.