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/Services/ActivityLogger.php

@@ -3,6 +3,7 @@
 namespace App\Services;
 
 use App\Jobs\LogActivityJob;
+use Carbon\CarbonInterface;
 use Illuminate\Database\Eloquent\Model;
 use Illuminate\Support\Facades\Log;
 
@@ -25,6 +26,8 @@ class ActivityLogger
         ?Model  $subject = null,
         array   $oldValues = [],
         array   $newValues = [],
+        ?CarbonInterface $startedAt = null,
+        ?CarbonInterface $finishedAt = null,
     ): void {
         try {
             [$causerType, $causerId, $causerName] = $this->resolveCauser();
@@ -42,6 +45,9 @@ class ActivityLogger
                 'new_values'   => $newValues ?: null,
                 'ip_address'   => request()->getClientIp(),
                 'user_agent'   => request()->userAgent(),
+                'started_at'   => $startedAt?->format('Y-m-d H:i:s.v'),
+                'finished_at'  => $finishedAt?->format('Y-m-d H:i:s.v'),
+                'created_at'   => now()->format('Y-m-d H:i:s.v'),
             ]);
         } catch (\Throwable $e) {
             Log::warning('[ActivityLogger] Failed to dispatch log job', [