Add settings, cloud places, and optional archive-content indexing.

Keep official clients in charge of sync while Explorer can group locations, persist UI prefs, and list zip/rar/7z members without extracting them.

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

tests/Explorer.Application.Tests/BrowseServiceTests.cs

@@ -95,7 +95,9 @@ public class BrowseServiceTests
             volumes,
             store,
             sources,
-            new StorageProviderRegistry([], NullLogger<StorageProviderRegistry>.Instance));
+            new StorageProviderRegistry([], NullLogger<StorageProviderRegistry>.Instance),
+            new CloudPlaceStore(env),
+            new UiPreferencesStore(env));
         return (browse, store);
     }
 }