Add username/password auth and login UI

Endpoints/ResultsEndpoints.cs

@@ -8,12 +8,15 @@ public static class ResultsEndpoints
 {
     public static void MapResultsEndpoints(this IEndpointRouteBuilder app)
     {
-        app.MapGet("/api/results", async (AppDbContext db) =>
+        app.MapGet("/api/results", async (HttpContext ctx, AppDbContext db) =>
         {
             var phase = await EndpointHelpers.GetPhase(db);
             if (phase != Phase.Results)
                 return EndpointHelpers.PhaseMismatch(Phase.Results, phase);
 
+            var player = await EndpointHelpers.GetAuthenticatedPlayer(ctx, db);
+            if (player is null) return Results.Unauthorized();
+
             var results = await db.Suggestions.AsNoTracking()
                 .Include(s => s.Player)
                 .Include(s => s.Votes)