feat(vm): hoàn tiền khi cấp VM lỗi, theo dõi job queue, uuid dịch vụ cho ticket, chuẩn hoá RAM addon

- VmProvisionException/VmProvisionRefund xử lý lỗi cấp phát VM
- QueueJobInspector + QueueMonitorController xem chi tiết job
- Thêm service uuid cho ticket, thời lượng cho activity_logs
- Migration chuẩn hoá RAM addon sang MB, trạng thái deleting cho snapshot

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

app/Http/Controllers/Api/QueueMonitorController.php

@@ -3,6 +3,7 @@
 namespace App\Http\Controllers\Api;
 
 use App\Http\Controllers\Controller;
+use App\Support\QueueJobInspector;
 use Illuminate\Http\JsonResponse;
 use Laravel\Horizon\Contracts\JobRepository;
 use Laravel\Horizon\Contracts\MetricsRepository;
@@ -71,6 +72,14 @@ class QueueMonitorController extends Controller
         ]);
     }
 
+    public function show(string $id): JsonResponse
+    {
+        $job = $this->jobs->getJobs([$id])->first();
+        abort_if(!$job, 404, "Không tìm thấy job #{$id}");
+
+        return response()->json(['success' => true, 'data' => QueueJobInspector::describe($job)]);
+    }
+
     /**
      * POST /api/queue/jobs/failed/{id}/retry
      * Re-queue a failed job by its Horizon job ID.