Add phase requirement filter for vote/results endpoints

Endpoints/ResultsEndpoints.cs

@@ -1,6 +1,7 @@
 using GameList.Data;
 using GameList.Domain;
 using Microsoft.EntityFrameworkCore;
+using GameList.Infrastructure;
 
 namespace GameList.Endpoints;
 
@@ -8,7 +9,9 @@ public static class ResultsEndpoints
 {
     public static void MapResultsEndpoints(this IEndpointRouteBuilder app)
     {
-        var group = app.MapGroup("/api/results").RequireAuthorization();
+        var group = app.MapGroup("/api/results")
+            .RequireAuthorization()
+            .AddEndpointFilter(new PhaseRequirementFilter(Phase.Results));
 
         group.MapGet(
             "/",