WS-4: Bestandsschutz-Abrechnung – gekoppelte Kündigung + Admin-Sichtbarkeit

M1 (portalübergreifend) und M5 (04:30-Worker) verifiziert; M2 + M3 umgesetzt.

- M2 (Entscheidung: getrennte Rechnungen, gekoppelte Kündigung): neuer
  LegacySubscriptionService::cancelBundleFor() kündigt das gesamte
  Bestandsschutz-Bündel eines Kunden gemeinsam – keine Einzelkündigung. Kein
  Rechnungs-Schema-Umbau (jede Kondition behält ihre MAN-Rechnung).
- M3: Admin-Payments-Ansicht zeigt eine "Bestandsschutz-Posten"-Tabelle
  (Badge, Portal, Netto, nächste Fälligkeit, "Bündel (N)") + Bündel-Kündigung
  mit Bestätigungsmodal.
- Tests: tests/Feature/Billing/LegacyBundleTest.php (M1 cross-portal, M2 Bündel-
  Kündigung + Gate, M3 Admin-Liste + Kündigung). Detailplan WS-4 dokumentiert.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

resources/views/livewire/admin/payments/index.blade.php

@@ -1,9 +1,13 @@
 <?php
 
 use App\Enums\InvoiceStatus;
+use App\Enums\UserPaymentOptionStatus;
 use App\Models\Invoice;
 use App\Models\Plan;
 use App\Models\SinglePurchase;
+use App\Models\User;
+use App\Models\UserPaymentOption;
+use App\Services\Billing\LegacySubscriptionService;
 use Illuminate\Database\Eloquent\Builder;
 use Laravel\Cashier\Subscription;
 use Livewire\Attributes\Layout;
@@ -17,11 +21,42 @@ new #[Layout('components.layouts.app'), Title('Zahlungen')] class extends Compon
 
     public string $search = '';
 
+    public string $notification = '';
+
+    public string $notificationType = 'success';
+
     public function updatedSearch(): void
     {
         $this->resetPage('subscriptionsPage');
         $this->resetPage('purchasesPage');
         $this->resetPage('invoicesPage');
+        $this->resetPage('bestandsschutzPage');
+    }
+
+    /**
+     * Kündigt das gesamte Bestandsschutz-Bündel eines Kunden gemeinsam
+     * (M2: keine Einzelkündigung).
+     */
+    public function cancelBundle(int $userId, LegacySubscriptionService $legacy): void
+    {
+        $user = User::query()->find($userId);
+
+        if (! $user) {
+            $this->notification = __('Der angeforderte Kunde wurde nicht gefunden.');
+            $this->notificationType = 'error';
+
+            return;
+        }
+
+        $count = $legacy->cancelBundleFor($user);
+
+        $this->notification = trans_choice(
+            ':count Bestandsschutz-Posten gemeinsam gekündigt.|:count Bestandsschutz-Posten gemeinsam gekündigt.',
+            $count,
+            ['count' => $count],
+        );
+        $this->notificationType = 'success';
+        $this->resetPage('bestandsschutzPage');
     }
 
     public function with(): array
@@ -54,6 +89,18 @@ new #[Layout('components.layouts.app'), Title('Zahlungen')] class extends Compon
                 : $entry['plan']->monthly_price_cents;
         });
 
+        // Bestandsschutz-Posten (M3): laufende Grandfathered-Vereinbarungen.
+        $grandfatheredBase = fn (): Builder => UserPaymentOption::query()
+            ->where('status', UserPaymentOptionStatus::Grandfathered->value)
+            ->whereNull('cancelled_at');
+
+        // Bündel-Größe je Kunde (für die „Bündel (N)"-Anzeige) – eine günstige
+        // Aggregat-Query statt N+1.
+        $bundleCounts = $grandfatheredBase()
+            ->selectRaw('user_id, count(*) as aggregate_count')
+            ->groupBy('user_id')
+            ->pluck('aggregate_count', 'user_id');
+
         return [
             'plansByPriceId' => $plansByPriceId,
             'stats' => [
@@ -64,7 +111,14 @@ new #[Layout('components.layouts.app'), Title('Zahlungen')] class extends Compon
                     ->where('paid_at', '>=', now()->subDays(30))
                     ->sum('total_cents'),
                 'open_purchases' => SinglePurchase::query()->grantingSubmission()->count(),
+                'grandfathered_posts' => $bundleCounts->sum(),
+                'grandfathered_customers' => $bundleCounts->count(),
             ],
+            'bestandsschutz' => $this->searchByUser($grandfatheredBase()->with('user:id,name,email'))
+                ->orderBy('user_id')
+                ->orderBy('id')
+                ->paginate(25, pageName: 'bestandsschutzPage'),
+            'bundleCounts' => $bundleCounts,
             'subscriptions' => $this->searchByUser(Subscription::query()->with('owner'))
                 ->latest('created_at')
                 ->paginate(25, pageName: 'subscriptionsPage'),
@@ -125,6 +179,22 @@ new #[Layout('components.layouts.app'), Title('Zahlungen')] class extends Compon
         </div>
     </header>
 
+    @if ($notification)
+        <div x-data="{ show: true }" x-init="setTimeout(() => show = false, 3500)" x-show="show" x-transition
+            @class([
+                'px-4 py-3 rounded-[5px] border text-[12.5px] flex items-center gap-2',
+                'bg-[color:var(--color-err-soft)] border-[color:var(--color-err)]/30 text-[color:var(--color-ink-2)]' => $notificationType === 'error',
+                'bg-[color:var(--color-ok-soft)] border-[color:var(--color-ok)]/30 text-[color:var(--color-gain-deep)]' => $notificationType !== 'error',
+            ])>
+            @if ($notificationType === 'error')
+                <flux:icon.exclamation-triangle class="size-[16px] flex-shrink-0" />
+            @else
+                <flux:icon.check-circle class="size-[16px] flex-shrink-0" />
+            @endif
+            {{ $notification }}
+        </div>
+    @endif
+
     {{-- ============== KPI-Reihe ============== --}}
     <section class="grid grid-cols-2 gap-4 lg:grid-cols-4">
         <x-portal.stat-card variant="primary" :label="__('Aktive Abos')" :value="number_format($stats['active_subscriptions'], 0, ',', '.')">
@@ -156,6 +226,127 @@ new #[Layout('components.layouts.app'), Title('Zahlungen')] class extends Compon
         </div>
     </article>
 
+    {{-- ============== BESTANDSSCHUTZ (Legacy-Posten, M3/M2) ============== --}}
+    <article class="panel overflow-hidden">
+        <div class="panel-head">
+            <span class="section-eyebrow">{{ __('Bestandsschutz-Posten') }}</span>
+            <span class="text-[11.5px] text-[color:var(--color-ink-3)]">
+                {{ __(':posts Posten · :customers Kunden', [
+                    'posts' => number_format($stats['grandfathered_posts'], 0, ',', '.'),
+                    'customers' => number_format($stats['grandfathered_customers'], 0, ',', '.'),
+                ]) }}
+            </span>
+        </div>
+        <div class="px-5 pt-4 text-[12px] text-[color:var(--color-ink-3)]">
+            {{ __('Migrierte Legacy-Vereinbarungen (kein Tarif-Merge). Posten je Portal getrennt, aber als Bündel nur gemeinsam kündbar – keine Einzelkündigung.') }}
+        </div>
+        <flux:table>
+            <flux:table.columns>
+                <flux:table.column>{{ __('User') }}</flux:table.column>
+                <flux:table.column>{{ __('Kondition') }}</flux:table.column>
+                <flux:table.column>{{ __('Portal') }}</flux:table.column>
+                <flux:table.column>{{ __('Netto') }}</flux:table.column>
+                <flux:table.column>{{ __('Nächste Fälligkeit') }}</flux:table.column>
+                <flux:table.column>{{ __('Bündel') }}</flux:table.column>
+                <flux:table.column>{{ __('Aktion') }}</flux:table.column>
+            </flux:table.columns>
+
+            @forelse ($bestandsschutz as $post)
+                @php
+                    $conditions = $post->legacy_conditions ?? [];
+                    $netCents = (int) ($conditions['net_cents'] ?? 0);
+                    $portalValue = $conditions['legacy_portal'] ?? null;
+                    $bundleSize = (int) ($bundleCounts[$post->user_id] ?? 1);
+                @endphp
+                <flux:table.row wire:key="bestandsschutz-{{ $post->id }}">
+                    <flux:table.cell>
+                        @if ($post->user)
+                            <div class="space-y-0.5">
+                                <flux:button size="xs" variant="filled" :href="route('admin.users.show', $post->user)" wire:navigate>
+                                    {{ $post->user->name }}
+                                </flux:button>
+                                <div class="text-[11px] text-[color:var(--color-ink-3)]">{{ $post->user->email }}</div>
+                            </div>
+                        @else
+                            <span class="text-[12px] text-[color:var(--color-ink-3)]">–</span>
+                        @endif
+                    </flux:table.cell>
+                    <flux:table.cell>
+                        <span class="badge ok dot">{{ __('Bestandsschutz') }}</span>
+                        <div class="text-[12px] text-[color:var(--color-ink)] mt-1">
+                            {{ $conditions['name'] ?? ($post->paymentOption?->article_number ?? '–') }}
+                        </div>
+                    </flux:table.cell>
+                    <flux:table.cell>
+                        <span class="badge hub">{{ $portalValue ? \Illuminate\Support\Str::headline($portalValue) : __('Unbekannt') }}</span>
+                    </flux:table.cell>
+                    <flux:table.cell>
+                        <span class="text-[12.5px] text-[color:var(--color-ink)]">
+                            {{ number_format($netCents / 100, 2, ',', '.') }} €
+                        </span>
+                    </flux:table.cell>
+                    <flux:table.cell>
+                        <span class="text-[12px] text-[color:var(--color-ink-3)]">
+                            {{ $post->current_period_end?->format('d.m.Y') ?? '–' }}
+                        </span>
+                    </flux:table.cell>
+                    <flux:table.cell>
+                        @if ($bundleSize > 1)
+                            <span class="badge warn">{{ __('Bündel (:n)', ['n' => $bundleSize]) }}</span>
+                        @else
+                            <span class="badge">{{ __('Einzeln') }}</span>
+                        @endif
+                    </flux:table.cell>
+                    <flux:table.cell>
+                        <flux:modal.trigger name="cancel-bundle-{{ $post->user_id }}">
+                            <flux:button size="sm" variant="filled" icon="x-circle" type="button"
+                                x-on:click.prevent="$dispatch('open-modal', 'cancel-bundle-{{ $post->user_id }}')">
+                                {{ __('Bündel kündigen') }}
+                            </flux:button>
+                        </flux:modal.trigger>
+
+                        <flux:modal name="cancel-bundle-{{ $post->user_id }}" class="max-w-lg">
+                            <div class="space-y-6">
+                                <div>
+                                    <flux:heading size="lg">{{ __('Bestandsschutz-Bündel kündigen?') }}</flux:heading>
+                                    <flux:subheading>
+                                        {{ trans_choice(
+                                            'Es wird :n Bestandsschutz-Posten von :user gekündigt. Eine Einzelkündigung ist nicht vorgesehen.|Es werden alle :n Bestandsschutz-Posten von :user gemeinsam gekündigt. Eine Einzelkündigung ist nicht vorgesehen.',
+                                            $bundleSize,
+                                            ['n' => $bundleSize, 'user' => $post->user?->name ?? '–'],
+                                        ) }}
+                                    </flux:subheading>
+                                </div>
+                                <div class="flex justify-end space-x-2 rtl:space-x-reverse">
+                                    <flux:modal.close>
+                                        <flux:button variant="filled">{{ __('Abbrechen') }}</flux:button>
+                                    </flux:modal.close>
+                                    <flux:button variant="danger" wire:click="cancelBundle({{ $post->user_id }})">
+                                        {{ __('Bündel kündigen') }}
+                                    </flux:button>
+                                </div>
+                            </div>
+                        </flux:modal>
+                    </flux:table.cell>
+                </flux:table.row>
+            @empty
+                <flux:table.row>
+                    <flux:table.cell colspan="7">
+                        <div class="flex flex-col items-center justify-center px-4 py-10 text-center">
+                            <div class="text-[14px] font-semibold text-[color:var(--color-ink)] mb-1">
+                                {{ __('Keine laufenden Bestandsschutz-Posten') }}
+                            </div>
+                        </div>
+                    </flux:table.cell>
+                </flux:table.row>
+            @endforelse
+        </flux:table>
+
+        <div class="border-t border-[color:var(--color-bg-rule)] p-4">
+            {{ $bestandsschutz->links('components.portal.pagination') }}
+        </div>
+    </article>
+
     {{-- ============== ABOS ============== --}}
     <article class="panel overflow-hidden">
         <div class="panel-head">