set DefaultScheme for authentication

Oqtane.Server/Extensions/OqtaneServiceCollectionExtensions.cs

@@ -121,8 +121,10 @@ namespace Microsoft.Extensions.DependencyInjection
 
         public static IServiceCollection ConfigureOqtaneCookieOptions(this IServiceCollection services)
         {
+            // note that ConfigureApplicationCookie internally uses an ApplicationScheme of "Identity.Application"
             services.ConfigureApplicationCookie(options =>
             {
+                options.Cookie.Domain = "localhost";
                 options.Cookie.HttpOnly = false;
                 options.Cookie.SameSite = SameSiteMode.Strict;
                 options.Cookie.SecurePolicy = CookieSecurePolicy.SameAsRequest;