Stand: SMTP-Test, Admin-Mail-Tab, Notifiable-Fix, Lazy-Quill

- Fix: Notifiable-Trait zum User-Model hinzugefuegt (behebt notify()-500er)
- Installer: SMTP-Verbindungstest mit EsmtpTransport + Ueberspringen-Link
- Admin: Neuer E-Mail-Tab mit SMTP-Konfiguration + Verbindungstest
- Admin: Lazy Quill-Initialisierung (nur sichtbare Locale wird geladen)
- Uebersetzungen: 17 neue Mail-Keys in allen 6 Sprachen

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

vendor/league/uri-interfaces/Contracts/IpHostInterface.php

@@ -0,0 +1,49 @@
+<?php
+
+/**
+ * League.Uri (https://uri.thephpleague.com)
+ *
+ * (c) Ignace Nyamagana Butera <nyamsprod@gmail.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+declare(strict_types=1);
+
+namespace League\Uri\Contracts;
+
+interface IpHostInterface extends HostInterface
+{
+    /**
+     * Tells whether the host is an IPv4 address.
+     */
+    public function isIpv4(): bool;
+
+    /**
+     * Tells whether the host is an IPv6 address.
+     */
+    public function isIpv6(): bool;
+
+    /**
+     * Tells whether the host is an IPv6 address.
+     */
+    public function isIpFuture(): bool;
+
+    /**
+     * Tells whether the host has a ZoneIdentifier.
+     *
+     * @see http://tools.ietf.org/html/rfc6874#section-4
+     */
+    public function hasZoneIdentifier(): bool;
+
+    /**
+     * Returns a host without its zone identifier according to RFC6874.
+     *
+     * This method MUST retain the state of the current instance, and return
+     * an instance without the host zone identifier according to RFC6874
+     *
+     * @see http://tools.ietf.org/html/rfc6874#section-4
+     */
+    public function withoutZoneIdentifier(): self;
+}