feat: add Qobuz playlist caching with versioning and infinite scroll UI

- Add qobuz_debug to .gitignore
- Bump PMOMusic version to 0.3.26
- Add .cargo/ copy in Dockerfile for registry config
- Implement infinite scroll in ServerDrawer.vue with IntersectionObserver and sentinel element
- Add source/source_version fields to playlists for cache invalidation
- Update pmocache and pmoplaylist DB schemas with versioning (SCHEMA_VERSION)
- Add Qobuz API metadata fetching and pagination for playlist tracks
- Implement album/playlist cache invalidation based on released_at/updated_at timestamps
- Refactor adapt_playlist_items_to_qobuz → adapt_items_to_qobuz with cleaner logic
- Add debug mode to save Qobuz API responses when QOBUZ_DEBUG_DIR is set

pmoqobuz/src/models.rs

@@ -54,6 +54,9 @@ pub struct Album {
     /// Date de sortie (format ISO 8601)
     #[serde(default)]
     pub release_date: Option<String>,
+    /// Timestamp Unix de sortie (released_at)
+    #[serde(default)]
+    pub released_at: Option<i64>,
     /// URL de l'image de couverture
     #[serde(default)]
     pub image: Option<String>,
@@ -141,6 +144,9 @@ pub struct Playlist {
     /// Indique si c'est une playlist publique
     #[serde(default)]
     pub is_public: bool,
+    /// Timestamp de dernière modification (Unix epoch secondes)
+    #[serde(default)]
+    pub updated_at: Option<i64>,
     /// Propriétaire de la playlist
     #[serde(default)]
     pub owner: Option<PlaylistOwner>,