Added authenication/authorization. Refactored api startup.

JSMR.UI.Blazor/Services/SessionState.cs

@@ -0,0 +1,28 @@
+namespace JSMR.UI.Blazor.Services;
+
+public sealed class SessionState(AuthenticationClient auth)
+{
+    public AuthenticationClient.MeResponse? Me { get; private set; }
+    public bool IsAuthenticated => Me is not null;
+
+    public event Action? Changed;
+
+    public async Task RefreshAsync(CancellationToken ct = default)
+    {
+        Me = await auth.GetMeAsync(ct);
+        Changed?.Invoke();
+    }
+
+    public async Task<bool> LoginAsync(string username, string password, CancellationToken ct = default)
+    {
+        var ok = await auth.LoginAsync(username, password, ct);
+        await RefreshAsync(ct);
+        return ok;
+    }
+
+    public async Task LogoutAsync(CancellationToken ct = default)
+    {
+        await auth.LogoutAsync(ct);
+        await RefreshAsync(ct);
+    }
+}