Split QueueResponse and introduce SearchResponse

Decoupled `QueueResponse` and `SearchResponse` to better align with their distinct API endpoints and simplify response structures. Updated `PlayOutcome.PendingPlaylist` and `SearchResultHandler` to include playlist `name`, ensuring consistency across related features and improving response clarity. Adjusted OpenAPI documentation and routes to reflect the separation.

src/main/java/me/bobert/netneutrality/music/SearchResultHandler.java

@@ -66,7 +66,7 @@ public class SearchResultHandler extends AbstractAudioLoadResultHandler {
         List<Track> candidates = truncated ? tracks.subList(0, maxPlaylistSize) : tracks;
 
         String searchId = PendingSearchResults.put(guild.getId(), candidates);
-        future.complete(new PlayOutcome.PendingPlaylist(searchId, candidates, truncated));
+        future.complete(new PlayOutcome.PendingPlaylist(searchId, result.getInfo().getName(), candidates, truncated));
     }
 
     @Override