[ADD] New entities for library db

Manager.Data/Models/LibraryContext/MediaEntity.cs

@@ -0,0 +1,33 @@
+namespace Manager.Data.Models.LibraryContext;
+
+public class MediaEntity : DateTimeBase
+{
+    public required string Id { get; set; }
+    public string? Title { get; set; }
+    public string? Description { get; set; }
+    public DateTime UploadDateUtc { get; set; }
+    public required string ChannelId { get; set; }
+    public List<MediaFormatEntity> Formats { get; set; } = [];
+    public List<CaptionEntity> Captions { get; set; } = [];
+    
+    public MediaState State { get; set; } = MediaState.Online;
+    public bool IsDownloaded { get; set; }
+    public MediaProcessState ProcessState { get; set; } = MediaProcessState.ToDownload;
+}
+
+public enum MediaState
+{
+    Online,
+    Offline,
+    Limited,
+    Removed
+}
+
+public enum MediaProcessState
+{
+    ToDownload,
+    Downloaded,
+    ToRemove,
+    Removed,
+    Failed
+}