impl cache create/delete with server create/delete

also impl test connection

app/models/music.ts

@@ -72,9 +72,9 @@ export type HomeLists = { [key: string]: AlbumListItem[] }
 export type StarrableItemType = 'song' | 'album' | 'artist'
 
 export enum CacheItemType {
-  coverArt,
-  artistArt,
-  song,
+  coverArt = 'coverArt',
+  artistArt = 'artistArt',
+  song = 'song',
 }
 
 export type CacheItemTypeKey = keyof typeof CacheItemType