Complete LinkedChildren integration and batch DTO optimizations

This commit integrates remaining performance changes:

- Add batch user data fetching in DtoService to reduce N+1 queries
- Add GetNextUpEpisodesBatch in TVSeriesManager for efficient batch retrieval
- Update Video/Movie/BoxSet to use LibraryManager for alternate versions
- Transition LinkedChild to use ItemId instead of Path (obsolete Path/LibraryItemId)
- Update providers and controllers for LinkedChildren-based references
- Add NextUpEpisodeBatchResult for batched episode queries
- Integrate IDescendantQueryProvider in SqliteDatabaseProvider

MediaBrowser.Controller/Entities/InternalItemsQuery.cs

@@ -33,6 +33,7 @@ namespace MediaBrowser.Controller.Entities
             ExcludeItemIds = Array.Empty<Guid>();
             ExcludeItemTypes = Array.Empty<BaseItemKind>();
             ExcludeTags = Array.Empty<string>();
+            ExtraTypes = Array.Empty<ExtraType>();
             GenreIds = Array.Empty<Guid>();
             Genres = Array.Empty<string>();
             GroupByPresentationUniqueKey = true;
@@ -44,6 +45,7 @@ namespace MediaBrowser.Controller.Entities
             MediaTypes = Array.Empty<MediaType>();
             OfficialRatings = Array.Empty<string>();
             OrderBy = Array.Empty<(ItemSortBy, SortOrder)>();
+            OwnerIds = Array.Empty<Guid>();
             PersonIds = Array.Empty<Guid>();
             PersonTypes = Array.Empty<string>();
             PresetViews = Array.Empty<CollectionType?>();
@@ -369,6 +371,8 @@ namespace MediaBrowser.Controller.Entities
 
         public bool SkipDeserialization { get; set; }
 
+        public bool IncludeExtras { get; set; }
+
         public void SetUser(User user)
         {
             var maxRating = user.MaxParentalRatingScore;