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/ServerManagerJob.php

@@ -7,6 +7,7 @@ use App\Models\Server;
 use App\Models\Team;
 use Cron\CronExpression;
 use Illuminate\Bus\Queueable;
+use Illuminate\Contracts\Queue\ShouldBeEncrypted;
 use Illuminate\Contracts\Queue\ShouldQueue;
 use Illuminate\Foundation\Bus\Dispatchable;
 use Illuminate\Queue\InteractsWithQueue;
@@ -15,7 +16,7 @@ use Illuminate\Support\Carbon;
 use Illuminate\Support\Collection;
 use Illuminate\Support\Facades\Log;
 
-class ServerManagerJob implements ShouldQueue
+class ServerManagerJob implements ShouldBeEncrypted, ShouldQueue
 {
     use Dispatchable, InteractsWithQueue, Queueable, SerializesModels;