[YouTube] Move Trending kiosk to kiosk package, add deprecation comment

Trending is still working at the time this commit is made, it has been
just removed from the interface.

Also remove getInstance method of YoutubeTrendingLinkHandlerFactory to
make the INSTANCE static field public, for consistency with other
kiosks of the service.

extractor/src/main/java/org/schabi/newpipe/extractor/services/youtube/YoutubeService.java

@@ -35,7 +35,7 @@ import org.schabi.newpipe.extractor.services.youtube.extractors.YoutubeSearchExt
 import org.schabi.newpipe.extractor.services.youtube.extractors.YoutubeStreamExtractor;
 import org.schabi.newpipe.extractor.services.youtube.extractors.YoutubeSubscriptionExtractor;
 import org.schabi.newpipe.extractor.services.youtube.extractors.YoutubeSuggestionExtractor;
-import org.schabi.newpipe.extractor.services.youtube.extractors.YoutubeTrendingExtractor;
+import org.schabi.newpipe.extractor.services.youtube.extractors.kiosk.YoutubeTrendingExtractor;
 import org.schabi.newpipe.extractor.services.youtube.extractors.kiosk.YoutubeLiveExtractor;
 import org.schabi.newpipe.extractor.services.youtube.extractors.kiosk.YoutubeTrendingGamingVideosExtractor;
 import org.schabi.newpipe.extractor.services.youtube.extractors.kiosk.YoutubeTrendingMoviesAndShowsTrailersExtractor;
@@ -164,7 +164,7 @@ public class YoutubeService extends StreamingService {
     @Override
     public KioskList getKioskList() throws ExtractionException {
         final KioskList list = new KioskList(this);
-        final ListLinkHandlerFactory trendingLHF = YoutubeTrendingLinkHandlerFactory.getInstance();
+        final ListLinkHandlerFactory trendingLHF = YoutubeTrendingLinkHandlerFactory.INSTANCE;
         final ListLinkHandlerFactory runningLivesLHF =
                 YoutubeLiveLinkHandlerFactory.INSTANCE;
         final ListLinkHandlerFactory trendingPodcastsEpisodesLHF =
@@ -218,6 +218,7 @@ public class YoutubeService extends StreamingService {
                     trendingMusicLHF,
                     YoutubeTrendingMusicLinkHandlerFactory.KIOSK_ID
             );
+            // Deprecated (i.e. removed from the interface of YouTube) since July 21, 2025
             list.addKioskEntry(
                     (streamingService, url, id) -> new YoutubeTrendingExtractor(
                             YoutubeService.this,

extractor/src/main/java/org/schabi/newpipe/extractor/services/youtube/extractors/kiosk/YoutubeTrendingExtractor.java

@@ -18,7 +18,7 @@
  * along with NewPipe Extractor. If not, see <https://www.gnu.org/licenses/>.
  */
 
-package org.schabi.newpipe.extractor.services.youtube.extractors;
+package org.schabi.newpipe.extractor.services.youtube.extractors.kiosk;
 
 import static org.schabi.newpipe.extractor.services.youtube.YoutubeParsingHelper.getJsonPostResponse;
 import static org.schabi.newpipe.extractor.services.youtube.YoutubeParsingHelper.getTextAtKey;
@@ -36,6 +36,7 @@ import org.schabi.newpipe.extractor.exceptions.ParsingException;
 import org.schabi.newpipe.extractor.kiosk.KioskExtractor;
 import org.schabi.newpipe.extractor.linkhandler.ListLinkHandler;
 import org.schabi.newpipe.extractor.localization.TimeAgoParser;
+import org.schabi.newpipe.extractor.services.youtube.extractors.YoutubeStreamInfoItemExtractor;
 import org.schabi.newpipe.extractor.stream.StreamInfoItem;
 import org.schabi.newpipe.extractor.stream.StreamInfoItemsCollector;
 

extractor/src/main/java/org/schabi/newpipe/extractor/services/youtube/linkHandler/YoutubeTrendingLinkHandlerFactory.java

@@ -33,16 +33,12 @@ import java.util.List;
 
 public final class YoutubeTrendingLinkHandlerFactory extends ListLinkHandlerFactory {
 
-    private static final YoutubeTrendingLinkHandlerFactory INSTANCE =
+    public static final YoutubeTrendingLinkHandlerFactory INSTANCE =
             new YoutubeTrendingLinkHandlerFactory();
 
     private YoutubeTrendingLinkHandlerFactory() {
     }
 
-    public static YoutubeTrendingLinkHandlerFactory getInstance() {
-        return INSTANCE;
-    }
-
     public String getUrl(final String id,
                          final List<String> contentFilters,
                          final String sortFilter)

extractor/src/test/java/org/schabi/newpipe/extractor/services/youtube/YoutubeKioskExtractorTest.java

@@ -9,7 +9,7 @@ import org.junit.jupiter.api.Test;
 import org.schabi.newpipe.extractor.exceptions.ParsingException;
 import org.schabi.newpipe.extractor.services.BaseListExtractorTest;
 import org.schabi.newpipe.extractor.services.DefaultSimpleExtractorTest;
-import org.schabi.newpipe.extractor.services.youtube.extractors.YoutubeTrendingExtractor;
+import org.schabi.newpipe.extractor.services.youtube.extractors.kiosk.YoutubeTrendingExtractor;
 
 public class YoutubeKioskExtractorTest {