feat(server): read-write external assets (#9235)

* refactor: remove isReadOnly and isExternal usages

* chore: open api

* fix: linting

* remove mobile isReadOnly dependency

---------

Co-authored-by: Alex Tran <alex.tran1502@gmail.com>

mobile/openapi/test/smart_search_dto_test.dart

@@ -51,11 +51,6 @@ void main() {
       // TODO
     });
 
-    // bool isExternal
-    test('to test the property `isExternal`', () async {
-      // TODO
-    });
-
     // bool isFavorite
     test('to test the property `isFavorite`', () async {
       // TODO
@@ -76,11 +71,6 @@ void main() {
       // TODO
     });
 
-    // bool isReadOnly
-    test('to test the property `isReadOnly`', () async {
-      // TODO
-    });
-
     // bool isVisible
     test('to test the property `isVisible`', () async {
       // TODO