[DB] Hardening integrità chiavi (mig.058): +4 UNIQUE +8 FK, retry-on-1062, bonifica 16 righe stale — v1.23.1

Estende l'audit mig.039 ai moduli 040-057 (non coperti).
TIER1 additivo (0 dup/0 orfani verificati su DB live):
- UNIQUE internal_audits/management_reviews (org,code), kb_uploaded_documents.qdrant_doc_uuid,
  whistleblowing_reports.anonymous_token (drop idx_token ridondante)
- retry-on-1062 in InternalAuditController/ManagementReviewController (allineati a periodic_controls)
- 6 FK: consulting_firm_id (organizations/users/kb)->consulting_firms; isms_soa.linked_control_id;
  isms_documents.linked_policy_id; management_review_decisions.capa_id (tutte SET NULL)
TIER2 bonifica (backup pre-DELETE in .backups/): -9 firm_org_assignments orfane (org 126-129,
  chiude deferred-b mig.039) -7 active_sessions scadute, +2 FK CASCADE.
FK totali 196->204. Sonda diagnostica db_integrity_probe.php. audit_logs lasciato by-design.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

docs/OPEN_TICKETS.md

@@ -3,4 +3,4 @@
 Nessun ticket aperto.
 
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-_Ultimo sync: 2026-06-17 12:10:01_
+_Ultimo sync: 2026-06-18 07:55:01_