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>

database/seeders/FileCategorySeeder.php

@@ -0,0 +1,26 @@
+<?php
+
+namespace Database\Seeders;
+
+use App\Models\FileCategory;
+use Illuminate\Database\Seeder;
+
+class FileCategorySeeder extends Seeder
+{
+    public function run(): void
+    {
+        $categories = [
+            ['name' => 'FAQ', 'slug' => 'faq', 'sort_order' => 1],
+            ['name' => 'Regelwerke', 'slug' => 'regelwerke', 'sort_order' => 2],
+            ['name' => 'Catering', 'slug' => 'catering', 'sort_order' => 3],
+            ['name' => 'Zeitnehmer', 'slug' => 'zeitnehmer', 'sort_order' => 4],
+            ['name' => 'Events', 'slug' => 'events', 'sort_order' => 5],
+            ['name' => 'Turniere', 'slug' => 'turniere', 'sort_order' => 6],
+            ['name' => 'Allgemein', 'slug' => 'allgemein', 'sort_order' => 7],
+        ];
+
+        foreach ($categories as $cat) {
+            FileCategory::updateOrCreate(['slug' => $cat['slug']], $cat);
+        }
+    }
+}