Batch 3: Integrări placeholder + Backup tenant

═══ Integrări (Marketing → Integrări) ═══
- /app/integrations Page cu 6 carduri (Telegram/WhatsApp/Google Ads/FB/SMS/Webhook)
- Toggle on/off per integrare; salvare în settings.integrations JSON
- Câmpuri specifice per integrare (token/key/id/secret)
- Banner explicativ: 'placeholder UI — implementare separată'

═══ Backup tenant ═══
- TenantBackupService::export($company) → ZIP cu:
  • data/ (1 JSON per tabel: clients/vehicles/leads/deals/work_orders cu sub-relații/...)
  • media/ (logo + favicon)
  • manifest.json (metadata + counts)
- /app/backup Page cu buton 'Descarcă backup acum'
- Streaming download cu deleteFileAfterSend
- Util pentru: backup local, migrare, audit, GDPR right-to-erasure

Total tenant routes: 104.
Toate cele ~26 module din prototip implementate (sau echivalent funcțional).

app/Filament/Tenant/Pages/Backup.php

@@ -0,0 +1,42 @@
+<?php
+
+namespace App\Filament\Tenant\Pages;
+
+use App\Models\Central\Company;
+use App\Services\TenantBackupService;
+use App\Tenancy\TenantManager;
+use Filament\Notifications\Notification;
+use Filament\Pages\Page;
+
+class Backup extends Page
+{
+    protected static string|\BackedEnum|null $navigationIcon = 'heroicon-o-archive-box-arrow-down';
+
+    protected static ?string $navigationLabel = 'Backup';
+
+    protected static string|\UnitEnum|null $navigationGroup = 'Admin';
+
+    protected static ?int $navigationSort = 96;
+
+    protected static ?string $title = 'Backup & Export date';
+
+    protected string $view = 'filament.tenant.pages.backup';
+
+    public function downloadBackup()
+    {
+        $tenant = app(TenantManager::class)->current();
+        if (! $tenant) abort(404);
+
+        // Re-fetch via central scope to avoid issues.
+        $company = Company::withoutGlobalScopes()->find($tenant->id);
+        if (! $company) abort(404);
+
+        $svc = app(TenantBackupService::class);
+        $file = $svc->export($company);
+        $filename = $svc->filename($company);
+
+        return response()->download($file, $filename, [
+            'Content-Type' => 'application/zip',
+        ])->deleteFileAfterSend();
+    }
+}