[FEAT] Simulazioni Demo + Audit Trail Certificato SHA-256

- 5 scenari reali: Onboarding, Ransomware Art.23, Data Breach Supply Chain,
  Whistleblowing SCADA, Audit Hash Chain Verification
- simulate-nis2.php: 3 aziende (DataCore/MedClinic/EnerNet), 10 fasi, CLI+SSE
- AuditService.php: hash chain SHA-256 stile lg231 (prev_hash+entry_hash)
- Migration 010: prev_hash, entry_hash, severity, performed_by su audit_logs
- AuditController: GET chain-verify + GET export-certified
- reset-demo.sql: reset dati demo idempotente
- public/simulate.html: web runner SSE con console dark-theme
- Sidebar: link Simulazione Demo + Integrazioni

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

public/index.php

@@ -264,6 +264,8 @@ $actionMap = [
         'GET:iso27001Mapping'       => 'getIsoMapping',
         'GET:executiveReport'       => 'executiveReport',
         'GET:export'                => 'export',
+        'GET:chainVerify'           => 'chainVerify',
+        'GET:exportCertified'       => 'exportCertified',
     ],
 
     // ── AdminController ─────────────────────────────