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/var-dumper/Caster/SocketCaster.php

@@ -0,0 +1,64 @@
+<?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\VarDumper\Caster;
+
+use Symfony\Component\VarDumper\Cloner\Stub;
+
+/**
+ * @author Nicolas Grekas <p@tchwork.com>
+ * @author Alexandre Daubois <alex.daubois@gmail.com>
+ *
+ * @internal
+ */
+final class SocketCaster
+{
+    public static function castSocket(\Socket $socket, array $a, Stub $stub, bool $isNested): array
+    {
+        socket_getsockname($socket, $addr, $port);
+        $info = stream_get_meta_data(socket_export_stream($socket));
+
+        if (\PHP_VERSION_ID >= 80300) {
+            $uri = ($info['uri'] ?? '//');
+            if (str_starts_with($uri, 'unix://')) {
+                $uri .= $addr;
+            } else {
+                $uri .= \sprintf(str_contains($addr, ':') ? '[%s]:%s' : '%s:%s', $addr, $port);
+            }
+
+            $a[Caster::PREFIX_VIRTUAL.'uri'] = $uri;
+
+            if (@socket_atmark($socket)) {
+                $a[Caster::PREFIX_VIRTUAL.'atmark'] = true;
+            }
+        }
+
+        $a += [
+            Caster::PREFIX_VIRTUAL.'timed_out' => $info['timed_out'],
+            Caster::PREFIX_VIRTUAL.'blocked' => $info['blocked'],
+        ];
+
+        if (!$lastError = socket_last_error($socket)) {
+            return $a;
+        }
+
+        static $errors;
+
+        if (!$errors) {
+            $errors = get_defined_constants(true)['sockets'] ?? [];
+            $errors = array_flip(array_filter($errors, static fn ($k) => str_starts_with($k, 'SOCKET_E'), \ARRAY_FILTER_USE_KEY));
+        }
+
+        $a[Caster::PREFIX_VIRTUAL.'last_error'] = new ConstStub($errors[$lastError], socket_strerror($lastError));
+
+        return $a;
+    }
+}