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/league/flysystem/src/WhitespacePathNormalizer.php

@@ -0,0 +1,49 @@
+<?php
+
+declare(strict_types=1);
+
+namespace League\Flysystem;
+
+class WhitespacePathNormalizer implements PathNormalizer
+{
+    public function normalizePath(string $path): string
+    {
+        $path = str_replace('\\', '/', $path);
+        $this->rejectFunkyWhiteSpace($path);
+
+        return $this->normalizeRelativePath($path);
+    }
+
+    private function rejectFunkyWhiteSpace(string $path): void
+    {
+        if (preg_match('#\p{C}+#u', $path)) {
+            throw CorruptedPathDetected::forPath($path);
+        }
+    }
+
+    private function normalizeRelativePath(string $path): string
+    {
+        $parts = [];
+
+        foreach (explode('/', $path) as $part) {
+            switch ($part) {
+                case '':
+                case '.':
+                    break;
+
+                case '..':
+                    if (empty($parts)) {
+                        throw PathTraversalDetected::forPath($path);
+                    }
+                    array_pop($parts);
+                    break;
+
+                default:
+                    $parts[] = $part;
+                    break;
+            }
+        }
+
+        return implode('/', $parts);
+    }
+}