Update RecAction route and refactor EnsureEntity logic

Changed the RecActionController Invoke route to remove the {cmd}
parameter, now accepting POST requests at "invoke" only.
Refactored DbModelOptions.EnsureEntity<T> by removing the
entities dictionary conversion logic for virtual and non-virtual
entities.

src/ReC.Infrastructure/Options/DbModelOptions.cs

@@ -11,7 +11,6 @@ public record DbModelOptions
 
     public void EnsureEntity<T>(bool isVirtual)
     {
-
         var entities = isVirtual
             ? VirtualEntities.ToDictionary(kvp => kvp.Key, kvp => kvp.Value as EntityBaseOptions)
             : Entities.ToDictionary(kvp => kvp.Key, kvp => kvp.Value as EntityBaseOptions);