Add missing Track, Album, Artist model types and client methods

Track: Added FileInfo, FileDownloadInfo, TrackFullInfo, SimilarTracks types
Album: Added AlbumSimilarEntities, AlbumTrailer, SimilarEntityItem types
Artist: Added ArtistSimilar, ArtistLinks, ArtistAbout, ArtistInfo, ArtistSkeleton,
       ArtistTrailerStatus, ArtistLink, Stats, SkeletonBlock types

Client methods added:
- artists.go: GetArtistBriefInfo, GetArtistSimilar, GetArtistLinks, GetArtistAlsoAlbums,
  GetArtistDiscographyAlbums, GetArtistSafeDirectAlbums, GetArtistTrackIds, GetArtistAbout,
  GetArtistDonation, GetArtistInfo, GetArtistSkeleton, GetArtistTrailer
- albums.go: GetAlbumSimilarEntities, GetAlbumTrailer
- tracks.go: GetTracksFileInfo, GetTracksSimilar, GetTrackTrailer, GetTrackFullInfo

internal/client/albums.go

@@ -3,6 +3,7 @@ package client
 
 import (
 	"context"
+	"fmt"
 
 	"gitea.mrixs.me/Mrixs/yandex-music-api-go/internal/models"
 	"gitea.mrixs.me/Mrixs/yandex-music-api-go/internal/utils"
@@ -69,3 +70,23 @@ func (c *Client) GetAlbumsWithTracks(ctx context.Context, albumIDs []string) ([]
 	}
 	return albums, nil
 }
+
+// GetAlbumSimilarEntities gets similar entities for an album (GET /albums/{id}/similar-entities).
+func (c *Client) GetAlbumSimilarEntities(ctx context.Context, albumID string) (*models.AlbumSimilarEntities, error) {
+	var result models.AlbumSimilarEntities
+	if err := c.request.Get(ctx, fmt.Sprintf("/albums/%s/similar-entities", albumID), nil, &result); err != nil {
+		return nil, err
+	}
+	result.SetClient(c)
+	return &result, nil
+}
+
+// GetAlbumTrailer gets album trailer (GET /albums/{id}/trailer).
+func (c *Client) GetAlbumTrailer(ctx context.Context, albumID string) (*models.AlbumTrailer, error) {
+	var result models.AlbumTrailer
+	if err := c.request.Get(ctx, fmt.Sprintf("/albums/%s/trailer", albumID), nil, &result); err != nil {
+		return nil, err
+	}
+	result.SetClient(c)
+	return &result, nil
+}