feat(aws-compat): queue attributes for Terraform (FifoQueue, ContentBasedDeduplication, Policy, real timestamps)

- GetQueueAttributes now returns FifoQueue, ContentBasedDeduplication, Policy and
  real Created/LastModifiedTimestamp (previously missing/stubbed '0000000000')
- Queue: add CreatedAt, LastModifiedAt, Policy, ContentBasedDeduplication
- parse FifoQueue/ContentBasedDeduplication in both protocols (StringToBool)
- Policy/RedriveAllowPolicy: normalize JSON-string form to object (JSON protocol
  sent them as string -> SetQueueAttributes failed with InvalidParameterValue)
- persistence: keep new fields in meta DTO + backfill empty timestamps on load
- FIFO dedup is inherent: IsDuplicate/InitDuplicatation gate on IsFIFO only
  (env flag EnableDuplicates=false disabled dedup for all FIFO queues)

app/gosqs/create_queue.go

@@ -59,6 +59,9 @@ func CreateQueueV1(req *http.Request) (int, interfaces.AbstractResponseBody) {
 		IsFIFO:           utils.HasFIFOQueueName(queueName),
 		EnableDuplicates: models.CurrentEnvironment.EnableDuplicates,
 		Duplicates:       make(map[string]time.Time),
+		// CreatedTimestamp/LastModifiedTimestamp в GetQueueAttributes (AWS их отдаёт).
+		CreatedAt:      time.Now().UTC(),
+		LastModifiedAt: time.Now().UTC(),
 	}
 	// Список имён переданных атрибутов — для whitelist-валидации
 	// (Query-протокол: Attribute.N.Name; JSON: nil — проверка пропускается).