Add Explorer Workbench with hierarchical, off-UI Storage analysis.

Storage queries run in the background with cancellation and covering indexes so switching views no longer freezes the UI.

Co-authored-by: Cursor <cursoragent@cursor.com>

src/Explorer.Application/AppOptions.cs

@@ -0,0 +1,10 @@
+using Explorer.Domain;
+
+namespace Explorer.Application;
+
+public sealed class AppOptions
+{
+    public int TombstoneRetentionDays { get; set; } = AppConstants.DefaultTombstoneRetentionDays;
+    public bool SkipHidden { get; set; } = true;
+    public bool SkipSystem { get; set; } = true;
+}