fix: optimize batch email performance and fix gift card issues

- Add chunking and batching for admin email sending
- Fix gift card pagination and add per_page limits
- Update frontend prompts and complete language packs

app/Jobs/SendEmailJob.php

@@ -3,6 +3,7 @@
 namespace App\Jobs;
 
 use App\Services\MailService;
+use Illuminate\Bus\Batchable;
 use Illuminate\Bus\Queueable;
 use Illuminate\Contracts\Queue\ShouldQueue;
 use Illuminate\Foundation\Bus\Dispatchable;
@@ -11,7 +12,7 @@ use Illuminate\Queue\SerializesModels;
 
 class SendEmailJob implements ShouldQueue
 {
-    use Dispatchable, InteractsWithQueue, Queueable, SerializesModels;
+    use Dispatchable, InteractsWithQueue, Queueable, SerializesModels, Batchable;
     protected $params;
 
     public $tries = 3;