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/service-contracts/ServiceProviderInterface.php

@@ -0,0 +1,45 @@
+<?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\Contracts\Service;
+
+use Psr\Container\ContainerInterface;
+
+/**
+ * A ServiceProviderInterface exposes the identifiers and the types of services provided by a container.
+ *
+ * @author Nicolas Grekas <p@tchwork.com>
+ * @author Mateusz Sip <mateusz.sip@gmail.com>
+ *
+ * @template-covariant T of mixed
+ */
+interface ServiceProviderInterface extends ContainerInterface
+{
+    /**
+     * @return T
+     */
+    public function get(string $id): mixed;
+
+    public function has(string $id): bool;
+
+    /**
+     * Returns an associative array of service types keyed by the identifiers provided by the current container.
+     *
+     * Examples:
+     *
+     *  * ['logger' => 'Psr\Log\LoggerInterface'] means the object provides a service named "logger" that implements Psr\Log\LoggerInterface
+     *  * ['foo' => '?'] means the container provides service name "foo" of unspecified type
+     *  * ['bar' => '?Bar\Baz'] means the container provides a service "bar" of type Bar\Baz|null
+     *
+     * @return array<string, string> The provided service types, keyed by service names
+     */
+    public function getProvidedServices(): array;
+}