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/error-handler/Resources/views/traces_text.html.php

@@ -0,0 +1,43 @@
+<table class="trace trace-as-text">
+    <thead class="trace-head">
+        <tr>
+            <th class="sf-toggle" data-toggle-selector="#trace-text-<?= $index; ?>" data-toggle-initial="<?= 1 === $index ? 'display' : ''; ?>">
+                <div class="trace-class">
+                    <?php if ($numExceptions > 1) { ?>
+                        <span class="text-muted">[<?= $numExceptions - $index + 1; ?>/<?= $numExceptions; ?>]</span>
+                    <?php } ?>
+                    <?= ($parts = explode('\\', $exception['class'])) ? end($parts) : ''; ?>
+                    <span class="icon icon-close"><?= $this->include('assets/images/icon-minus-square-o.svg'); ?></span>
+                    <span class="icon icon-open"><?= $this->include('assets/images/icon-plus-square-o.svg'); ?></span>
+                </div>
+            </th>
+        </tr>
+    </thead>
+
+    <tbody id="trace-text-<?= $index; ?>">
+        <tr>
+            <td>
+                <?php if ($exception['trace']) { ?>
+                <pre class="stacktrace">
+<?php
+                    echo $this->escape($exception['class']).":\n";
+                    if ($exception['message']) {
+                        echo $this->escape($exception['message'])."\n";
+                    }
+
+                    foreach ($exception['trace'] as $trace) {
+                        echo "\n  ";
+                        if ($trace['function']) {
+                            echo $this->escape('at '.$trace['class'].$trace['type'].$trace['function']).'('.(isset($trace['args']) ? $this->formatArgsAsText($trace['args']) : '').')';
+                        }
+                        if ($trace['file'] && $trace['line']) {
+                            echo($trace['function'] ? "\n     (" : 'at ').strtr(strip_tags($this->formatFile($trace['file'], $trace['line'])), [' at line '.$trace['line'] => '']).':'.$trace['line'].($trace['function'] ? ')' : '');
+                        }
+                    }
+?>
+                </pre>
+                <?php } ?>
+            </td>
+        </tr>
+    </tbody>
+</table>