[FIX] Database::execute() → Database::query() in 5 controller

Database non ha metodo execute() — corretto in:
InviteController, ServicesController, WebhookController,
NormativeController, WhistleblowingController.
Causa del HTTP 500 su tutti gli endpoint /api/invites/*.

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

application/controllers/ServicesController.php

@@ -95,7 +95,7 @@ class ServicesController extends BaseController
 
         // Aggiorna last_used_at (async: non blocchiamo su errore)
         try {
-            Database::execute(
+            Database::query(
                 'UPDATE api_keys SET last_used_at = NOW() WHERE id = ?',
                 [$record['id']]
             );
@@ -329,7 +329,7 @@ class ServicesController extends BaseController
             $firstName = $parts[0] ?? $email;
             $lastName  = $parts[1] ?? '';
 
-            Database::execute(
+            Database::query(
                 'INSERT INTO users (email, password_hash, first_name, last_name, role, status)
                  VALUES (?, ?, ?, ?, ?, "active")',
                 [$email, '', $firstName, $lastName, $role]
@@ -345,7 +345,7 @@ class ServicesController extends BaseController
             [$userId, $orgId]
         );
         if (!$membership) {
-            Database::execute(
+            Database::query(
                 'INSERT INTO user_organizations (user_id, organization_id, role) VALUES (?, ?, ?)',
                 [$userId, $orgId, $role]
             );
@@ -558,7 +558,7 @@ class ServicesController extends BaseController
             $orgId = (int) $existing['id'];
         } else {
             // ── 4. Crea organizzazione ───────────────────────────────────
-            Database::execute(
+            Database::query(
                 'INSERT INTO organizations
                  (name, legal_form, vat_number, fiscal_code, ateco_code, ateco_description,
                   legal_address, pec, phone, annual_turnover_eur, employees,
@@ -602,7 +602,7 @@ class ServicesController extends BaseController
         if ($existingUser) {
             $userId = (int) $existingUser['id'];
         } else {
-            Database::execute(
+            Database::query(
                 'INSERT INTO users (email, password_hash, first_name, last_name, role, status,
                   phone, job_title, must_change_password)
                  VALUES (?,?,?,?,\'super_admin\',\'active\',?,?,1)',
@@ -618,7 +618,7 @@ class ServicesController extends BaseController
             [$userId, $orgId]
         );
         if (!$mem) {
-            Database::execute(
+            Database::query(
                 'INSERT INTO user_organizations (user_id, organization_id, role) VALUES (?,?,\'super_admin\')',
                 [$userId, $orgId]
             );
@@ -635,12 +635,12 @@ class ServicesController extends BaseController
             : date('Y-m-d H:i:s', strtotime('+12 months'));
 
         // Revoca eventuali chiavi lg231-integration precedenti (idempotency)
-        Database::execute(
+        Database::query(
             'UPDATE api_keys SET is_active=0 WHERE organization_id=? AND name LIKE \'lg231-integration-%\'',
             [$orgId]
         );
 
-        Database::execute(
+        Database::query(
             'INSERT INTO api_keys (organization_id, name, key_prefix, key_hash, scopes, is_active, expires_at, created_by)
              VALUES (?,?,?,?,?,1,?,?)',
             [