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/console/Output/NullOutput.php

@@ -0,0 +1,94 @@
+<?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\Console\Output;
+
+use Symfony\Component\Console\Formatter\NullOutputFormatter;
+use Symfony\Component\Console\Formatter\OutputFormatterInterface;
+
+/**
+ * NullOutput suppresses all output.
+ *
+ *     $output = new NullOutput();
+ *
+ * @author Fabien Potencier <fabien@symfony.com>
+ * @author Tobias Schultze <http://tobion.de>
+ */
+class NullOutput implements OutputInterface
+{
+    private NullOutputFormatter $formatter;
+
+    public function setFormatter(OutputFormatterInterface $formatter): void
+    {
+        // do nothing
+    }
+
+    public function getFormatter(): OutputFormatterInterface
+    {
+        // to comply with the interface we must return a OutputFormatterInterface
+        return $this->formatter ??= new NullOutputFormatter();
+    }
+
+    public function setDecorated(bool $decorated): void
+    {
+        // do nothing
+    }
+
+    public function isDecorated(): bool
+    {
+        return false;
+    }
+
+    public function setVerbosity(int $level): void
+    {
+        // do nothing
+    }
+
+    public function getVerbosity(): int
+    {
+        return self::VERBOSITY_SILENT;
+    }
+
+    public function isSilent(): bool
+    {
+        return true;
+    }
+
+    public function isQuiet(): bool
+    {
+        return false;
+    }
+
+    public function isVerbose(): bool
+    {
+        return false;
+    }
+
+    public function isVeryVerbose(): bool
+    {
+        return false;
+    }
+
+    public function isDebug(): bool
+    {
+        return false;
+    }
+
+    public function writeln(string|iterable $messages, int $options = self::OUTPUT_NORMAL): void
+    {
+        // do nothing
+    }
+
+    public function write(string|iterable $messages, bool $newline = false, int $options = self::OUTPUT_NORMAL): void
+    {
+        // do nothing
+    }
+}