feat: add database connections, initial migration and early CLI tooling

Entities/Album.cs

@@ -0,0 +1,16 @@
+namespace Shadow.Entities;
+public class Album
+{
+	required public int Id { get; set; }
+	public required string Name { get; set; }
+	public required string Uri { get; set; }
+	public int State { get; set; } = 0;
+	public int? ArtistId { get; set; } = null;
+
+	public Artist? Artist { get; set; } = null;
+	public List<Song> Songs { get; set; } = [];
+
+	public bool IsOk() => State == 0;
+	public bool IsOrphaned() => State == 1;
+	public bool IsArchived() => State == 2;
+}