[FEAT] L4 AI Cross-Analysis — analisi aggregata multi-org per consulenti

- CrossAnalysisController.php: analyze/history/portfolio (k-anonymity min 2 org)
- AIService::crossOrgAnalysis(): aggregazione 9 dimensioni, zero PII nel prompt
- cross-analysis.html: chat UI purple theme, 3 tab, quick questions, portfolio stats
- index.php: routing /api/cross-analysis/{analyze,history,portfolio}
- common.js: link "AI Cross-Analysis" in sidebar sezione Gestione
- docs/AI_LEVELS_SCHEMA.md: schema architetturale L1-L5 con matrice privacy

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

public/index.php

@@ -102,7 +102,8 @@ $controllerMap = [
     'invites'       => 'InviteController',
     'webhooks'      => 'WebhookController',
     'whistleblowing'=> 'WhistleblowingController',
-    'normative'     => 'NormativeController',
+    'normative'       => 'NormativeController',
+    'cross-analysis'  => 'CrossAnalysisController',
 ];
 
 if (!isset($controllerMap[$controllerName])) {
@@ -361,6 +362,13 @@ $actionMap = [
         'GET:stats'                  => 'stats',
         'POST:create'                => 'create',
     ],
+
+    // ── CrossAnalysisController (L4 AI cross-org) ──
+    'cross-analysis' => [
+        'POST:analyze'               => 'analyze',
+        'GET:history'                => 'history',
+        'GET:portfolio'              => 'portfolio',
+    ],
 ];
 
 // ═══════════════════════════════════════════════════════════════════════════