feat: add timestamp interceptor and infrastructure service registration

src/FiscalOS.Infra/DependencyInjection/ServiceCollectionExtensions.cs

@@ -0,0 +1,13 @@
+namespace FiscalOS.Infra.DependencyInjection;
+
+public static class ServiceCollectionExtensions
+{
+  public static IServiceCollection AddInfrastructure(this IServiceCollection services)
+  {
+    services.AddSingleton<IPasswordHasher, PasswordHasher>(static (_) => PasswordHasher.New());
+    services.ConfigureOptions<AppDbContextOptionsSetup>();
+    services.AddDbContext<AppDbContext>();
+    services.AddHostedService<MigrationService>();
+    return services;
+  }
+}