Phase 3, version history (list + restore). CareerProfileVersions was already
populated on every save; this makes it usable.
- ICareerProfileService.ListVersionsAsync — the append-only history, newest first,
with the current version flagged.
- RestoreVersionAsync — reapplies a past snapshot NON-DESTRUCTIVELY: it is re-saved
as a new version, so the current state stays in history and the restore is itself
reversible. Syncs the relational children + blob projection like any save.
- Endpoints: GET /career/profile/versions, POST /career/profile/versions/{v}/restore.
Tests (+4): versions listed newest-first with current flagged; restore reapplies
an old snapshot as a new version (history preserved, reversible); restore of a
missing version returns null.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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