feat: server health and statistics endpoints added

Platforms/Server/PongEndpoints.cs

@@ -0,0 +1,39 @@
+using System;
+using System.Threading.Tasks;
+
+using Microsoft.AspNetCore.Builder;
+using Microsoft.AspNetCore.Http;
+using Microsoft.Extensions.DependencyInjection;
+
+using Syntriax.Engine.Core;
+using Syntriax.Engine.Network;
+
+namespace Server;
+
+public class PongEndpoints : Behaviour, IFirstFrameUpdate
+{
+    private INetworkCommunicatorServer? server = null!;
+
+    public PongEndpoints()
+    {
+        Task.Run(() =>
+        {
+            WebApplicationBuilder builder = WebApplication.CreateBuilder();
+
+            builder.Services.AddHealthChecks();
+
+            WebApplication app = builder.Build();
+
+            app.MapHealthChecks("/health");
+
+            app.MapGet("/stats", GetStats);
+
+            app.Run($"http://0.0.0.0:{Environment.GetEnvironmentVariable("PORT") ?? "8888"}");
+        });
+    }
+
+    private IResult GetStats() => Results.Json(new { Count = server?.Connections.Count ?? 0 });
+
+    public void FirstActiveFrame() => server = Universe.FindRequiredBehaviour<INetworkCommunicatorServer>();
+    protected override void OnExitedUniverse(IUniverse universe) => server = null;
+}