Fix library performance

Jellyfin.Server.Implementations/Item/BaseItemRepository.cs

@@ -335,6 +335,7 @@ public sealed class BaseItemRepository
             }
 
             var itemsById = ApplyNavigations(context.BaseItems.Where(e => orderedIds.Contains(e.Id)), filter)
+                .AsSplitQuery()
                 .AsEnumerable()
                 .Select(w => DeserializeBaseItem(w, filter.SkipDeserialization))
                 .Where(dto => dto is not null)