Introduce typed API responses and align workflow outputs

Endpoints/VoteWorkflowService.cs

@@ -80,11 +80,7 @@ internal sealed class VoteWorkflowService(AppDbContext db)
         }
 
         await db.SaveChangesAsync();
-        return Results.Ok(new
-        {
-            SuggestionIds = linkedIds,
-            request.Score
-        });
+        return Results.Ok(new VoteUpsertResponse(linkedIds, request.Score));
     }
 
     public async Task<IResult> SetFinalizeAsync(Player player, VoteFinalizeRequest request)
@@ -95,6 +91,6 @@ internal sealed class VoteWorkflowService(AppDbContext db)
 
         player.VotesFinal = request.Final;
         await db.SaveChangesAsync();
-        return Results.Ok(new { player.VotesFinal });
+        return Results.Ok(new VoteFinalizeResponse(player.VotesFinal));
     }
 }