[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>

public/js/api.js

@@ -72,6 +72,7 @@ class NIS2API {
         const result = await this.post('/auth/login', { email, password });
         if (result.success) {
             this.setTokens(result.data.access_token, result.data.refresh_token);
+            this.setUserRole(result.data.user.role);
             if (result.data.organizations && result.data.organizations.length > 0) {
                 const primary = result.data.organizations.find(o => o.is_primary) || result.data.organizations[0];
                 this.setOrganization(primary.organization_id);
@@ -80,10 +81,11 @@ class NIS2API {
         return result;
     }
 
-    async register(email, password, fullName) {
-        const result = await this.post('/auth/register', { email, password, full_name: fullName });
+    async register(email, password, fullName, userType = 'azienda') {
+        const result = await this.post('/auth/register', { email, password, full_name: fullName, user_type: userType });
         if (result.success) {
             this.setTokens(result.data.access_token, result.data.refresh_token);
+            localStorage.setItem('nis2_user_role', result.data.user.role);
         }
         return result;
     }
@@ -122,6 +124,20 @@ class NIS2API {
         localStorage.removeItem('nis2_access_token');
         localStorage.removeItem('nis2_refresh_token');
         localStorage.removeItem('nis2_org_id');
+        localStorage.removeItem('nis2_user_role');
+    }
+
+    // Salva ruolo utente al login
+    setUserRole(role) {
+        localStorage.setItem('nis2_user_role', role);
+    }
+
+    getUserRole() {
+        return localStorage.getItem('nis2_user_role');
+    }
+
+    isConsultant() {
+        return this.getUserRole() === 'consultant';
     }
 
     setOrganization(orgId) {