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/phpunit/php-code-coverage/src/Report/Xml/Source.php

@@ -0,0 +1,41 @@
+<?php declare(strict_types=1);
+/*
+ * This file is part of phpunit/php-code-coverage.
+ *
+ * (c) Sebastian Bergmann <sebastian@phpunit.de>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+namespace SebastianBergmann\CodeCoverage\Report\Xml;
+
+use DOMElement;
+use TheSeer\Tokenizer\NamespaceUri;
+use TheSeer\Tokenizer\Tokenizer;
+use TheSeer\Tokenizer\XMLSerializer;
+
+/**
+ * @internal This class is not covered by the backward compatibility promise for phpunit/php-code-coverage
+ */
+final class Source
+{
+    private readonly DOMElement $context;
+
+    public function __construct(DOMElement $context)
+    {
+        $this->context = $context;
+    }
+
+    public function setSourceCode(string $source): void
+    {
+        $context = $this->context;
+
+        $tokens = (new Tokenizer)->parse($source);
+        $srcDom = (new XMLSerializer(new NamespaceUri($context->namespaceURI)))->toDom($tokens);
+
+        $context->parentNode->replaceChild(
+            $context->ownerDocument->importNode($srcDom->documentElement, true),
+            $context,
+        );
+    }
+}