Add enum for Selection method

src/Managing.Api/Controllers/BacktestController.cs

@@ -306,9 +306,6 @@ public class BacktestController : BaseController
                 request.MaxTakeProfit,
                 request.EligibleIndicators);
 
-            // TODO: Trigger background genetic algorithm execution
-            // This will be implemented in the next step with a background service
-
             return Ok(geneticRequest);
         }
         catch (Exception ex)

src/Managing.Api/Models/Requests/RunGeneticRequest.cs

@@ -50,7 +50,7 @@ public class RunGeneticRequest
     /// <summary>
     /// The selection method to use
     /// </summary>
-    public string SelectionMethod { get; set; } = "tournament";
+    public GeneticSelectionMethod SelectionMethod { get; set; }
 
     /// <summary>
     /// The percentage of elite individuals to preserve (1-50)