feat(work-order-dashboard): PDF download in Docs tab + gate chat by config

- Documente tab: link to a new /app/work-orders/{id}/pdf route that
  streams the invoice PDF via WorkOrderPdfService; also lists any
  files uploaded to the 'signed_documents' media collection.
- Chat client card: only show the input form when telegram_bot or
  whatsapp_business is enabled AND credentialed in the tenant's
  Integrations page. Otherwise render an empty state with a shortcut
  to /app/integrations.

RU + EN translations added for the new strings (RO source).

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

routes/web.php

@@ -47,6 +47,15 @@ Route::post('/payments/paypal/webhook', [\App\Http\Controllers\PaymentController
 Route::post('/payments/paynet/webhook', [\App\Http\Controllers\PaymentController::class, 'paynetWebhook'])
     ->withoutMiddleware([\Illuminate\Foundation\Http\Middleware\VerifyCsrfToken::class]);
 
+// PDF download for a work order (used from dashboard's Documents tab).
+Route::get('/app/work-orders/{workOrder}/pdf', function (int $workOrder) {
+    abort_unless(auth('web')->check(), 403);
+    $wo = \App\Models\Tenant\WorkOrder::findOrFail($workOrder);
+    $svc = app(\App\Services\WorkOrderPdfService::class);
+    $pdf = $svc->generate($wo);
+    return response()->streamDownload(fn () => print($pdf->output()), $svc->filename($wo));
+})->name('work-orders.pdf');
+
 // User invitation accept flow (no auth required — token is the credential).
 Route::get('/invitations/{token}', [\App\Http\Controllers\InvitationController::class, 'show'])
     ->name('invitation.show');