Frontend first draft

frontend/pshared/lib/models/permissions/action.dart

@@ -0,0 +1,15 @@
+enum Action {
+  create,
+  read,
+  update,
+  delete,
+}
+
+extension ActionExtension on Action {
+  String toShortString() => toString().split('.').last;
+
+  static Action fromString(String value) => Action.values.firstWhere(
+    (e) => e.toShortString() == value,
+    orElse: () => throw ArgumentError('Invalid action: $value'),
+  );
+}