Migrate many view templates from raw PHP to Twig and modernize UI/UX for 2FA and settings. Controllers updated to provide avatar data and two-factor info (ProfileController, UserController) and SettingsController now includes timezone lists, notification preset selection, cron path, cached update state and rollback availability. ErrorHandler now attempts to render error pages via a new Core\TwigService with a safe fallback to raw PHP views. TwoFactorService generation silences deprecated warnings during QR code creation. Numerous .php view files were removed and replaced with .twig equivalents (2fa setup/verify/backup-codes and many auth, dashboard, domains, errors, layout, users, tags, tld-registry, etc.), and core/TwigService was added. These changes move the app toward a Twig-based templating system, improve 2FA flows, surface avatar images in lists/profiles, and make error rendering more robust.
Introduces two-factor authentication (2FA) with TOTP, backup codes, and email codes. Adds controllers, services, views, and migration for 2FA setup, verification, and management. Updates user and settings models, email helper, and relevant controllers to support 2FA policy enforcement, configuration, and user flows. Enhances security by allowing admins to require or disable 2FA, and provides backup code generation and management for account recovery.
