Add remaining model types and client methods

Models added:
- Disclaimer, ForeignAgent (credits.go)
- ArtistConcerts (concert.go)
- Dashboard, StationResult, Station, AdParams, GenerativeStream,
  GenerativeStreamData, GenerativeStreamInfo (radio.go)
- FileInfo, FileDownloadInfo, TrackFullInfo, SimilarTracks, TrackTrailer (track.go)
- Removed duplicate AdParams from feed.go

Client methods added:
- artists.go: GetArtistBriefInfo, GetArtistSimilar, GetArtistLinks,
  GetArtistAlsoAlbums, GetArtistDiscographyAlbums, GetArtistSafeDirectAlbums,
  GetArtistTrackIds, GetArtistAbout, GetArtistDonation, GetArtistInfo,
  GetArtistSkeleton, GetArtistTrailer
- albums.go: GetAlbumSimilarEntities, GetAlbumTrailer
- clips.go: GetClipsDisclaimer
- concerts.go: GetArtistConcerts, GetConcertSkeleton
- radio.go: GetRotorStationsDashboard, GetRotorStationsList,
  GetRotorStationInfo, GetRotorStationStream, GetRotorStationSettings
- supplements.go: GetTracksCredits, GetClipsCredits
- queue.go: GetQueuesList
- tracks.go: GetTracksFileInfo, GetTracksSimilar, GetTrackTrailer, GetTrackFullInfo

internal/client/supplements.go

@@ -129,6 +129,26 @@ type Sign struct {
 	Value     string
 }
 
+// GetTracksCredits gets track credits (GET /tracks/{id}/credits).
+func (c *Client) GetTracksCredits(ctx context.Context, trackID string) (*models.Credits, error) {
+	var result models.Credits
+	if err := c.request.Get(ctx, fmt.Sprintf("/tracks/%s/credits", trackID), nil, &result); err != nil {
+		return nil, err
+	}
+	result.SetClient(c)
+	return &result, nil
+}
+
+// GetClipsCredits gets clip credits (GET /clips/{id}/credits).
+func (c *Client) GetClipsCredits(ctx context.Context, clipID string) (*models.Credits, error) {
+	var result models.Credits
+	if err := c.request.Get(ctx, fmt.Sprintf("/clips/%s/credits", clipID), nil, &result); err != nil {
+		return nil, err
+	}
+	result.SetClient(c)
+	return &result, nil
+}
+
 // GetSignRequest creates a signature for a track request (exported for external use).
 // It delegates to utils.GetSignRequest with the default signing key.
 func GetSignRequest(trackID string) Sign {