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/ramsey/collection/src/AbstractSet.php

@@ -0,0 +1,51 @@
+<?php
+
+/**
+ * This file is part of the ramsey/collection library
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ *
+ * @copyright Copyright (c) Ben Ramsey <ben@benramsey.com>
+ * @license http://opensource.org/licenses/MIT MIT
+ */
+
+declare(strict_types=1);
+
+namespace Ramsey\Collection;
+
+/**
+ * This class contains the basic implementation of a collection that does not
+ * allow duplicated values (a set), to minimize the effort required to implement
+ * this specific type of collection.
+ *
+ * @template T
+ * @extends AbstractCollection<T>
+ */
+abstract class AbstractSet extends AbstractCollection
+{
+    public function add(mixed $element): bool
+    {
+        if ($this->contains($element)) {
+            return false;
+        }
+
+        // Call offsetSet() on the parent instead of add(), since calling
+        // parent::add() will invoke $this->offsetSet(), which will call
+        // $this->contains() a second time. This can cause performance issues
+        // with extremely large collections. For more information, see
+        // https://github.com/ramsey/collection/issues/68.
+        parent::offsetSet(null, $element);
+
+        return true;
+    }
+
+    public function offsetSet(mixed $offset, mixed $value): void
+    {
+        if ($this->contains($value)) {
+            return;
+        }
+
+        parent::offsetSet($offset, $value);
+    }
+}