feat(jobs): implement encrypted queue jobs

- Add ShouldBeEncrypted interface to all queue jobs to encrypt sensitive
  job payloads
- Configure explicit retry policies for messaging jobs (5 attempts,
  10-second backoff)

app/Jobs/SyncStripeSubscriptionsJob.php

@@ -4,12 +4,13 @@ namespace App\Jobs;
 
 use App\Models\Subscription;
 use Illuminate\Bus\Queueable;
+use Illuminate\Contracts\Queue\ShouldBeEncrypted;
 use Illuminate\Contracts\Queue\ShouldQueue;
 use Illuminate\Foundation\Bus\Dispatchable;
 use Illuminate\Queue\InteractsWithQueue;
 use Illuminate\Queue\SerializesModels;
 
-class SyncStripeSubscriptionsJob implements ShouldQueue
+class SyncStripeSubscriptionsJob implements ShouldBeEncrypted, ShouldQueue
 {
     use Dispatchable, InteractsWithQueue, Queueable, SerializesModels;