Fix API endpoints: resource IDs in URL path, not query params

- artists/{artist_id}/tracks and /direct-albums: artistID in path, return ArtistTracks/ArtistAlbums with pager
- likes: /users/me/likes/{type}s/{add-multiple|remove}, IDs as body params
- queue: /queues/{queue_id}/... instead of /queue/...?queue_id=...
- radio: /rotor/station/{station_id}/info and /tracks
- concerts: /concerts/{concert_id}/info, /concerts/tab-config
- playlists: /users/{user_id}/playlists
- labels: /labels/{label_id}, /albums, /artists
- clips: /clips/will/like, /artists/{artist_id}/blocks/artist-clips
- feed: /landing3/* endpoints

Co-Authored-By: Claude Code <noreply@anthropic.com>

internal/client/playlists.go

@@ -53,13 +53,10 @@ func (c *Client) GetPlaylist(ctx context.Context, kind int) (*models.Playlist, e
 }
 
 // GetUserPlaylists gets playlists for a user
+// GET /users/{userID}/playlists
 func (c *Client) GetUserPlaylists(ctx context.Context, userID string) ([]*models.Playlist, error) {
-	params := map[string]string{
-		"user-id": userID,
-	}
-
 	var result []models.Playlist
-	if err := c.request.Get(ctx, "/users/playlists", params, &result); err != nil {
+	if err := c.request.Get(ctx, fmt.Sprintf("/users/%s/playlists", userID), nil, &result); err != nil {
 		return nil, err
 	}