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/http-kernel/Bundle/AbstractBundle.php

@@ -0,0 +1,61 @@
+<?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\HttpKernel\Bundle;
+
+use Symfony\Component\Config\Definition\Configurator\DefinitionConfigurator;
+use Symfony\Component\DependencyInjection\Container;
+use Symfony\Component\DependencyInjection\ContainerBuilder;
+use Symfony\Component\DependencyInjection\Extension\ConfigurableExtensionInterface;
+use Symfony\Component\DependencyInjection\Extension\ExtensionInterface;
+use Symfony\Component\DependencyInjection\Loader\Configurator\ContainerConfigurator;
+
+/**
+ * A Bundle that provides configuration hooks.
+ *
+ * @author Yonel Ceruto <yonelceruto@gmail.com>
+ */
+abstract class AbstractBundle extends Bundle implements ConfigurableExtensionInterface
+{
+    protected string $extensionAlias = '';
+
+    public function configure(DefinitionConfigurator $definition): void
+    {
+    }
+
+    public function prependExtension(ContainerConfigurator $container, ContainerBuilder $builder): void
+    {
+    }
+
+    public function loadExtension(array $config, ContainerConfigurator $container, ContainerBuilder $builder): void
+    {
+    }
+
+    public function getContainerExtension(): ?ExtensionInterface
+    {
+        if ('' === $this->extensionAlias) {
+            $this->extensionAlias = Container::underscore(preg_replace('/Bundle$/', '', $this->getName()));
+        }
+
+        return $this->extension ??= new BundleExtension($this, $this->extensionAlias);
+    }
+
+    public function getPath(): string
+    {
+        if (!isset($this->path)) {
+            $reflected = new \ReflectionObject($this);
+            // assume the modern directory structure by default
+            $this->path = \dirname($reflected->getFileName(), 2);
+        }
+
+        return $this->path;
+    }
+}