Add Api and startup check for sufficient storage capacity (#13888)

MediaBrowser.Model/System/LibraryStorageInfo.cs

@@ -0,0 +1,25 @@
+using System;
+using System.Collections.Generic;
+
+namespace MediaBrowser.Model.System;
+
+/// <summary>
+/// Contains informations about a libraries storage informations.
+/// </summary>
+public class LibraryStorageInfo
+{
+    /// <summary>
+    /// Gets or sets the Library Id.
+    /// </summary>
+    public required Guid Id { get; set; }
+
+    /// <summary>
+    /// Gets or sets the name of the library.
+    /// </summary>
+    public required string Name { get; set; }
+
+    /// <summary>
+    /// Gets or sets the storage informations about the folders used in a library.
+    /// </summary>
+    public required IReadOnlyCollection<FolderStorageInfo> Folders { get; set; }
+}