[FEAT] Ruolo Consulente + Wizard Registrazione v2

- register.html: step 0 scelta profilo (Azienda / Consulente)
- onboarding.html: wizard 4-step con P.IVA obbligatoria (auto-fetch CertiSource)
- companies.html: nuova dashboard consulente con cards aziende e compliance score
- common.js: org-switcher sidebar + role labels corretti per consulente
- login.html: routing post-login (consulente → companies.html)
- api.js: isConsultant(), setUserRole(), register con user_type
- AuthController: user_type=consultant → role=consultant in users table
- OnboardingController: multi-org per consulente, duplicate VAT check
- 005_consultant_support.sql: aggiunge 'consultant' a user_organizations.role ENUM

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

application/controllers/AuthController.php

@@ -26,6 +26,8 @@ class AuthController extends BaseController
         $password = $this->getParam('password');
         $fullName = trim($this->getParam('full_name'));
         $phone = $this->getParam('phone');
+        $userType = $this->getParam('user_type', 'azienda'); // 'azienda' | 'consultant'
+        $role = ($userType === 'consultant') ? 'consultant' : 'employee';
 
         // Validazione email
         if (!$this->validateEmail($email)) {
@@ -54,7 +56,7 @@ class AuthController extends BaseController
             'password_hash' => password_hash($password, PASSWORD_DEFAULT),
             'full_name'     => $fullName,
             'phone'         => $phone,
-            'role'          => 'employee',
+            'role'          => $role,
             'is_active'     => 1,
         ]);
 
@@ -64,14 +66,14 @@ class AuthController extends BaseController
 
         // Audit log
         $this->currentUser = ['id' => $userId];
-        $this->logAudit('user_registered', 'user', $userId);
+        $this->logAudit('user_registered', 'user', $userId, ['user_type' => $userType]);
 
         $this->jsonSuccess([
             'user' => [
                 'id'        => $userId,
                 'email'     => $email,
                 'full_name' => $fullName,
-                'role'      => 'employee',
+                'role'      => $role,
             ],
             'access_token'  => $accessToken,
             'refresh_token' => $refreshToken,