Added authenication/authorization. Refactored api startup.

JSMR.UI.Blazor/Services/AuthenticationClient.cs

@@ -0,0 +1,29 @@
+using System.Net;
+using System.Net.Http.Json;
+
+namespace JSMR.UI.Blazor.Services;
+
+public class AuthenticationClient(HttpClient http)
+{
+    public async Task<bool> LoginAsync(string username, string password, CancellationToken ct = default)
+    {
+        var resp = await http.PostAsJsonAsync("/auth/login", new { username, password }, ct);
+        return resp.IsSuccessStatusCode;
+    }
+
+    public async Task LogoutAsync(CancellationToken ct = default)
+        => await http.PostAsync("/auth/logout", content: null, ct);
+
+    public async Task<MeResponse?> GetMeAsync(CancellationToken ct = default)
+    {
+        var resp = await http.GetAsync("/api/me", ct);
+
+        if (resp.StatusCode == HttpStatusCode.Unauthorized)
+            return null;
+
+        resp.EnsureSuccessStatusCode();
+        return await resp.Content.ReadFromJsonAsync<MeResponse>(cancellationToken: ct);
+    }
+
+    public sealed record MeResponse(string? name, string? id, string? role);
+}