feat: Add LDAP/Active Directory integration with group-based access control

- Add PHP LDAP extension to Docker container
- Implement LdapSync class for authentication and user synchronization
- Add automatic user sync via cron (every 30 minutes)
- Create role-based access control system (admin, manager, viewer)
- Add LDAP configuration UI in settings
- Support for both Active Directory and OpenLDAP
- Group-to-role mapping with flexible configuration
- Add 50+ translations (EN + RU) for LDAP features
- Include comprehensive setup documentation
- Enhance Auth::login() with LDAP fallback
- Add LDAP settings page with connection testing

templates/settings.twig

@@ -47,6 +47,10 @@
                class="tab-link border-transparent text-gray-500 hover:text-gray-700 py-4 px-1 border-b-2 font-medium text-sm">
                 <i class="fas fa-users mr-2"></i>{{ t('settings.users') }}
             </a>
+            <a href="/settings/ldap"
+               class="tab-link border-transparent text-gray-500 hover:text-gray-700 py-4 px-1 border-b-2 font-medium text-sm">
+                <i class="fas fa-network-wired mr-2"></i>LDAP
+            </a>
             {% endif %}
         </nav>
     </div>