Encrypt SMTP password at rest with AES-256-GCM

app/templates/admin/parametres.php

@@ -254,7 +254,7 @@
                 <div>
                     <label for="smtp_password">Mot de passe</label>
                     <input type="password" id="smtp_password" name="smtp_password"
-                           value="<?= htmlspecialchars($smtpSettings['password']) ?>"
+                           value=""
                            autocomplete="new-password"
                            placeholder="Laissez vide pour ne pas modifier"
                            <?= $smtpFieldErr('smtp_password') ?>