Refactor endpoint services to accept narrow inputs

Endpoints/ResultsWorkflowService.cs

@@ -7,13 +7,13 @@ namespace GameList.Endpoints;
 
 internal sealed class ResultsWorkflowService(AppDbContext db)
 {
-    public async Task<IResult> GetResultsAsync(Player player)
+    public async Task<IResult> GetResultsAsync(Guid playerId)
     {
         var appState = await db.AppState.AsNoTracking().FirstAsync();
         if (!appState.ResultsOpen)
             return EndpointHelpers.BadRequestError("Results are locked until the admin enables them.");
 
-        var phase = await EndpointHelpers.GetCurrentPhaseAsync(db, player.Id);
+        var phase = await EndpointHelpers.GetCurrentPhaseAsync(db, playerId);
         if (phase != Phase.Results)
             return EndpointHelpers.PhaseMismatch(Phase.Results, phase);
 
@@ -33,7 +33,7 @@ internal sealed class ResultsWorkflowService(AppDbContext db)
                 Average = s.Votes.Count == 0 ? 0 : s.Votes.Average(v => v.Score),
                 Votes = s.Votes.Select(v => v.Score).ToList(),
                 MyVote = s.Votes
-                    .Where(v => v.PlayerId == player.Id)
+                    .Where(v => v.PlayerId == playerId)
                     .Select(v => (int?)v.Score)
                     .FirstOrDefault(),
                 s.ScreenshotUrl,