Feature-Toggles, Administration, wiederkehrende Events und Event-Serien

- Administration & Rollenmanagement: Neuer Admin-Bereich mit Feature-Toggles
  und Sichtbarkeitseinstellungen pro Rolle (11 Toggles, 24 Visibility-Settings)
- AdministrationController mit eigenem Settings-Tab, aus SettingsController extrahiert
- Feature-Toggle-Guards in Controllers (Invitation, File, ListGenerator, Comment)
  und Views (events/show, events/edit, events/create)
- Setting::isFeatureEnabled() und isFeatureVisibleFor() Hilfsmethoden
- Wiederkehrende Trainings: Täglich/Wöchentlich/2-Wöchentlich mit Ende per
  Datum oder Anzahl (max. 52), Vorschau im Formular
- Event-Serien: Verknüpfung über event_series_id (UUID), Modal-Dialog beim
  Speichern und Löschen mit Optionen "nur dieses" / "alle folgenden"
- Löschen-Button direkt in der Event-Bearbeitung mit Serien-Dialog
- DemoDataSeeder: 4 Trainings als Serie mit gemeinsamer event_series_id
- Übersetzungen in allen 6 Sprachen (de, en, pl, ru, ar, tr)

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

database/migrations/0041_01_01_000000_add_feature_toggle_settings.php

@@ -0,0 +1,81 @@
+<?php
+
+use App\Models\Setting;
+use Illuminate\Database\Migrations\Migration;
+
+return new class extends Migration
+{
+    public function up(): void
+    {
+        // Globale Feature-Toggles (Master-Schalter)
+        $featureToggles = [
+            ['key' => 'feature_statistics', 'label' => 'Feature: Statistiken', 'type' => 'number', 'value' => '1'],
+            ['key' => 'feature_finances', 'label' => 'Feature: Finanzen', 'type' => 'number', 'value' => '1'],
+            ['key' => 'feature_catering', 'label' => 'Feature: Catering', 'type' => 'number', 'value' => '1'],
+            ['key' => 'feature_timekeepers', 'label' => 'Feature: Zeitnehmer', 'type' => 'number', 'value' => '1'],
+            ['key' => 'feature_carpools', 'label' => 'Feature: Fahrgemeinschaften', 'type' => 'number', 'value' => '1'],
+            ['key' => 'feature_comments', 'label' => 'Feature: Kommentare', 'type' => 'number', 'value' => '1'],
+            ['key' => 'feature_files', 'label' => 'Feature: Dateien', 'type' => 'number', 'value' => '1'],
+            ['key' => 'feature_faqs', 'label' => 'Feature: FAQs', 'type' => 'number', 'value' => '1'],
+            ['key' => 'feature_list_generator', 'label' => 'Feature: Listenerstellung', 'type' => 'number', 'value' => '1'],
+            ['key' => 'feature_invitations', 'label' => 'Feature: Einladungen', 'type' => 'number', 'value' => '1'],
+            ['key' => 'feature_player_stats', 'label' => 'Feature: Spielerstatistiken', 'type' => 'number', 'value' => '1'],
+        ];
+
+        foreach ($featureToggles as $toggle) {
+            if (!Setting::where('key', $toggle['key'])->exists()) {
+                $setting = new Setting([
+                    'label' => $toggle['label'],
+                    'type' => $toggle['type'],
+                    'value' => $toggle['value'],
+                ]);
+                $setting->key = $toggle['key'];
+                $setting->save();
+            }
+        }
+
+        // Neue pro-Rolle Visibility-Settings (zusätzlich zu bestehenden)
+        $newVisibility = [
+            'catering', 'timekeepers', 'carpools', 'comments',
+            'files', 'faqs', 'list_generator', 'invitations', 'player_stats',
+        ];
+
+        foreach ($newVisibility as $feature) {
+            foreach (['coach', 'parent_rep'] as $role) {
+                $key = "visibility_{$feature}_{$role}";
+                if (!Setting::where('key', $key)->exists()) {
+                    $setting = new Setting([
+                        'label' => ucfirst(str_replace('_', ' ', $feature)) . ': ' . ucfirst(str_replace('_', ' ', $role)),
+                        'type' => 'number',
+                        'value' => '1',
+                    ]);
+                    $setting->key = $key;
+                    $setting->save();
+                }
+            }
+        }
+    }
+
+    public function down(): void
+    {
+        $featureKeys = [
+            'feature_statistics', 'feature_finances', 'feature_catering',
+            'feature_timekeepers', 'feature_carpools', 'feature_comments',
+            'feature_files', 'feature_faqs', 'feature_list_generator',
+            'feature_invitations', 'feature_player_stats',
+        ];
+
+        Setting::whereIn('key', $featureKeys)->delete();
+
+        $newVisibility = [
+            'catering', 'timekeepers', 'carpools', 'comments',
+            'files', 'faqs', 'list_generator', 'invitations', 'player_stats',
+        ];
+
+        foreach ($newVisibility as $feature) {
+            foreach (['coach', 'parent_rep'] as $role) {
+                Setting::where('key', "visibility_{$feature}_{$role}")->delete();
+            }
+        }
+    }
+};

database/migrations/0042_01_01_000000_add_event_series_id.php

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+<?php
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\Schema;
+
+return new class extends Migration
+{
+    public function up(): void
+    {
+        Schema::table('events', function (Blueprint $table) {
+            $table->string('event_series_id', 36)->nullable()->after('status')->index();
+        });
+    }
+
+    public function down(): void
+    {
+        Schema::table('events', function (Blueprint $table) {
+            $table->dropIndex(['event_series_id']);
+            $table->dropColumn('event_series_id');
+        });
+    }
+};