Fix Track model to match Python reference

- R128: changed from JSONR128 float64 to R128 struct with i, tp, important_secs fields
  (Python R128 is an object, not a number)
- StorageID -> StorageDir with json tag storage_dir (Python API uses storage_dir)
- Lyrics: replaced TrackLyricsInfo with Lyrics (from supplement/lyrics.py) and
  TrackLyricsInfo (from track/lyrics_info.py with has_available_sync_lyrics,
  has_available_text_lyrics fields)
- Track.Lyrics field now maps to lyrics_info JSON key with TrackLyricsInfo type

internal/models/track_short.go

@@ -11,7 +11,7 @@ type TrackShort struct {
 	ID                       JSONID            `json:"id"`
 	Title                    string            `json:"title"`
 	DurationMs               int               `json:"duration_ms"`
-	StorageID                string            `json:"storage_id"`
+	StorageDir               string            `json:"storage_dir"`
 	CoverURI                 string            `json:"cover_uri"`
 	Artists                  []Artist          `json:"artists"`
 	Albums                   []Album           `json:"albums"`
@@ -20,7 +20,7 @@ type TrackShort struct {
 	Explicit                 bool              `json:"explicit"`
 	Available                bool              `json:"available"`
 	AvailableForPremiumUsers bool              `json:"available_for_premium_users"`
-	R128                     JSONR128          `json:"r128"`
+	R128                     *R128             `json:"r128"`
 	TrackSharingFlag         string            `json:"track_sharing_flag"`
 	Major                    *Major            `json:"major"`
 	Lyrics                   *SupplementLyrics `json:"lyrics"`
@@ -51,8 +51,8 @@ func (t *TrackShort) DeJSON(data []byte, c ClientInterface) (Model, error) {
 	if v, ok := raw["duration_ms"]; ok {
 		json.Unmarshal(v, &track.DurationMs)
 	}
-	if v, ok := raw["storage_id"]; ok {
-		json.Unmarshal(v, &track.StorageID)
+	if v, ok := raw["storage_dir"]; ok {
+		json.Unmarshal(v, &track.StorageDir)
 	}
 	if v, ok := raw["cover_uri"]; ok {
 		json.Unmarshal(v, &track.CoverURI)