M3 Mailversand und Public-Landingpage vorbereiten

- Mail-Transport fuer Reset- und Verifizierungslinks ergaenzen
- Public-Landingpage mit Hero-Asset und App-CTAs bauen
- Mail-Flow-Test, Smoke-Abdeckung und SaaS-Doku aktualisieren

register.php

@@ -1,6 +1,7 @@
 <?php
 
 require_once __DIR__ . '/functions.php';
+require_once __DIR__ . '/app/saas-mail.php';
 
 $pdo = app_db_pdo();
 $errors = [];
@@ -24,6 +25,9 @@ if ($_SERVER['REQUEST_METHOD'] === 'POST') {
     ]);
 
     if ($result['ok']) {
+        if (!empty($result['email_verification_token'])) {
+            saas_send_email_verification_mail($values['email'], (string)$result['email_verification_token']);
+        }
         saas_session_login($result['identity']);
         if (saas_should_show_auth_links() && !empty($result['email_verification_token'])) {
             $_SESSION['saas_dev_email_verification_token'] = (string)$result['email_verification_token'];