Update ProfileController to use CreatedAtAction in Post

Changed the Post method to return CreatedAtAction, providing a Location header linking to the new profile resource, in line with RESTful best practices.

src/ReC.API/Controllers/ProfileController.cs

@@ -29,7 +29,7 @@ public class ProfileController(IMediator mediator) : ControllerBase
     public async Task<IActionResult> Post([FromBody] InsertProfileProcedure procedure, CancellationToken cancel)
     {
         var id = await mediator.ExecuteInsertProcedure(procedure, cancel: cancel);
-        return StatusCode(StatusCodes.Status201Created, id);
+        return CreatedAtAction(nameof(Get), new { id }, id);
     }
 
     /// <summary>