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/clock/MockClock.php

@@ -0,0 +1,84 @@
+<?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\Clock;
+
+/**
+ * A clock that always returns the same date, suitable for testing time-sensitive logic.
+ *
+ * Consider using ClockSensitiveTrait in your test cases instead of using this class directly.
+ *
+ * @author Nicolas Grekas <p@tchwork.com>
+ */
+final class MockClock implements ClockInterface
+{
+    private DatePoint $now;
+
+    /**
+     * @throws \DateMalformedStringException When $now is invalid
+     * @throws \DateInvalidTimeZoneException When $timezone is invalid
+     */
+    public function __construct(\DateTimeImmutable|string $now = 'now', \DateTimeZone|string|null $timezone = null)
+    {
+        if (\is_string($timezone)) {
+            $timezone = new \DateTimeZone($timezone);
+        }
+
+        if (\is_string($now)) {
+            $now = new DatePoint($now, $timezone ?? new \DateTimeZone('UTC'));
+        } elseif (!$now instanceof DatePoint) {
+            $now = DatePoint::createFromInterface($now);
+        }
+
+        $this->now = null !== $timezone ? $now->setTimezone($timezone) : $now;
+    }
+
+    public function now(): DatePoint
+    {
+        return clone $this->now;
+    }
+
+    public function sleep(float|int $seconds): void
+    {
+        if (0 >= $seconds) {
+            return;
+        }
+
+        $now = (float) $this->now->format('Uu') + $seconds * 1e6;
+        $now = substr_replace(\sprintf('@%07.0F', $now), '.', -6, 0);
+        $timezone = $this->now->getTimezone();
+
+        $this->now = DatePoint::createFromInterface(new \DateTimeImmutable($now, $timezone))->setTimezone($timezone);
+    }
+
+    /**
+     * @throws \DateMalformedStringException When $modifier is invalid
+     */
+    public function modify(string $modifier): void
+    {
+        $this->now = $this->now->modify($modifier);
+    }
+
+    /**
+     * @throws \DateInvalidTimeZoneException When the timezone name is invalid
+     */
+    public function withTimeZone(\DateTimeZone|string $timezone): static
+    {
+        if (\is_string($timezone)) {
+            $timezone = new \DateTimeZone($timezone);
+        }
+
+        $clone = clone $this;
+        $clone->now = $clone->now->setTimezone($timezone);
+
+        return $clone;
+    }
+}