Add authentication and token services.

Marechai.App/Services/Endpoints/HttpAuthHandler.cs

@@ -0,0 +1,22 @@
+using System.Net.Http;
+using System.Net.Http.Headers;
+using System.Threading;
+using System.Threading.Tasks;
+using Marechai.App.Services.Authentication;
+
+namespace Marechai.App.Services.Endpoints;
+
+public sealed class HttpAuthHandler(ITokenService tokenService) : DelegatingHandler
+{
+    protected override async Task<HttpResponseMessage> SendAsync(HttpRequestMessage request,
+                                                                 CancellationToken  cancellationToken)
+    {
+        string token = tokenService.GetToken();
+
+        if(!string.IsNullOrEmpty(token)) request.Headers.Authorization = new AuthenticationHeaderValue("Bearer", token);
+
+        HttpResponseMessage response = await base.SendAsync(request, cancellationToken);
+
+        return response;
+    }
+}