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/models/album.go

@@ -422,3 +422,107 @@ type AlbumActionButton struct {
 	ViewBrowser bool  `json:"view_browser"`
 }
 
+// AlbumSimilarEntities represents similar entities for an album.
+type AlbumSimilarEntities struct {
+	BaseModel
+	Items []SimilarEntityItem `json:"items"`
+}
+
+// DeJSON deserializes AlbumSimilarEntities from JSON data.
+func (ae *AlbumSimilarEntities) DeJSON(data []byte, c ClientInterface) (Model, error) {
+	var raw map[string]json.RawMessage
+	if err := json.Unmarshal(data, &raw); err != nil {
+		return nil, err
+	}
+
+	entities := &AlbumSimilarEntities{BaseModel: *NewBaseModel(c)}
+
+	if v, ok := raw["items"]; ok {
+		var items []SimilarEntityItem
+		json.Unmarshal(v, &items)
+		entities.Items = items
+	}
+
+	return entities, nil
+}
+
+// DeList deserializes a list of AlbumSimilarEntities from JSON data.
+func (ae *AlbumSimilarEntities) DeList(data []byte, c ClientInterface) ([]Model, error) {
+	var rawList []json.RawMessage
+	if err := json.Unmarshal(data, &rawList); err != nil {
+		return nil, err
+	}
+
+	result := make([]Model, 0, len(rawList))
+	for _, item := range rawList {
+		entities := &AlbumSimilarEntities{BaseModel: *NewBaseModel(c)}
+		if err := json.Unmarshal(item, entities); err != nil {
+			continue
+		}
+		result = append(result, entities)
+	}
+	return result, nil
+}
+
+// SimilarEntityItem represents a similar entity item.
+type SimilarEntityItem struct {
+	BaseModel
+	ID    JSONID        `json:"id"`
+	Type  string        `json:"type"`
+	Data  json.RawMessage `json:"data"`
+}
+
+// AlbumTrailer represents album trailer info.
+type AlbumTrailer struct {
+	BaseModel
+	Album   *Album      `json:"album"`
+	Artists []Artist    `json:"artists"`
+	Trailer *TrailerInfo `json:"trailer"`
+}
+
+// DeJSON deserializes AlbumTrailer from JSON data.
+func (at *AlbumTrailer) DeJSON(data []byte, c ClientInterface) (Model, error) {
+	var raw map[string]json.RawMessage
+	if err := json.Unmarshal(data, &raw); err != nil {
+		return nil, err
+	}
+
+	trailer := &AlbumTrailer{BaseModel: *NewBaseModel(c)}
+
+	if v, ok := raw["album"]; ok {
+		var album Album
+		json.Unmarshal(v, &album)
+		trailer.Album = &album
+	}
+	if v, ok := raw["artists"]; ok {
+		var artists []Artist
+		json.Unmarshal(v, &artists)
+		trailer.Artists = artists
+	}
+	if v, ok := raw["trailer"]; ok {
+		var trailerInfo TrailerInfo
+		json.Unmarshal(v, &trailerInfo)
+		trailer.Trailer = &trailerInfo
+	}
+
+	return trailer, nil
+}
+
+// DeList deserializes a list of AlbumTrailer from JSON data.
+func (at *AlbumTrailer) DeList(data []byte, c ClientInterface) ([]Model, error) {
+	var rawList []json.RawMessage
+	if err := json.Unmarshal(data, &rawList); err != nil {
+		return nil, err
+	}
+
+	result := make([]Model, 0, len(rawList))
+	for _, item := range rawList {
+		trailer := &AlbumTrailer{BaseModel: *NewBaseModel(c)}
+		if err := json.Unmarshal(item, trailer); err != nil {
+			continue
+		}
+		result = append(result, trailer)
+	}
+	return result, nil
+}
+