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/symfony/routing/Attribute/DeprecatedAlias.php

@@ -0,0 +1,50 @@
+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Symfony\Component\Routing\Attribute;
+
+/**
+ * This class is meant to be used in {@see Route} to define an alias for a route.
+ */
+class DeprecatedAlias
+{
+    public function __construct(
+        public readonly string $aliasName,
+        public readonly string $package,
+        public readonly string $version,
+        public readonly string $message = '',
+    ) {
+    }
+
+    #[\Deprecated('Use the "message" property instead', 'symfony/routing:7.4')]
+    public function getMessage(): string
+    {
+        return $this->message;
+    }
+
+    #[\Deprecated('Use the "aliasName" property instead', 'symfony/routing:7.4')]
+    public function getAliasName(): string
+    {
+        return $this->aliasName;
+    }
+
+    #[\Deprecated('Use the "package" property instead', 'symfony/routing:7.4')]
+    public function getPackage(): string
+    {
+        return $this->package;
+    }
+
+    #[\Deprecated('Use the "version" property instead', 'symfony/routing:7.4')]
+    public function getVersion(): string
+    {
+        return $this->version;
+    }
+}