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.API/Controllers/RecActionController.cs

@@ -18,7 +18,7 @@ public class RecActionController(IMediator mediator, IConfiguration config) : Co
     /// <param name="profileId">The ID of the profile.</param>
     /// <param name="cancel">A token to cancel the operation.</param>
     /// <returns>An HTTP 202 Accepted response indicating the process has been started.</returns>
-    [HttpPost("invoke/{cmd}")]
+    [HttpPost("invoke")]
     [ProducesResponseType(StatusCodes.Status202Accepted)]
     public async Task<IActionResult> Invoke([FromRoute] int profileId, CancellationToken cancel)
     {