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/models/artist_tracks.go

@@ -0,0 +1,55 @@
+package models
+
+import (
+	"encoding/json"
+)
+
+// ArtistTracks represents a page of tracks by an artist
+type ArtistTracks struct {
+	BaseModel
+	Tracks []Track `json:"tracks"`
+	Pager  *Pager  `json:"pager"`
+}
+
+// DeJSON deserializes an ArtistTracks from JSON
+func (at *ArtistTracks) DeJSON(data []byte, c ClientInterface) (Model, error) {
+	var raw map[string]json.RawMessage
+	if err := json.Unmarshal(data, &raw); err != nil {
+		return nil, err
+	}
+
+	tracks := &ArtistTracks{BaseModel: *NewBaseModel(c)}
+
+	if v, ok := raw["tracks"]; ok {
+		var trackList []Track
+		if err := json.Unmarshal(v, &trackList); err == nil {
+			tracks.Tracks = trackList
+		}
+	}
+	if v, ok := raw["pager"]; ok {
+		var pager Pager
+		if err := json.Unmarshal(v, &pager); err == nil {
+			tracks.Pager = &pager
+		}
+	}
+
+	return tracks, nil
+}
+
+// DeList deserializes a list of ArtistTracks
+func (at *ArtistTracks) 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 {
+		tracks := &ArtistTracks{BaseModel: *NewBaseModel(c)}
+		if err := json.Unmarshal(item, tracks); err != nil {
+			continue
+		}
+		result = append(result, tracks)
+	}
+	return result, nil
+}