- Add btcexplorercookiefile to BTCPay deterministic config so NBXplorer cookie authentication succeeds (fixes 401 Unauthorized) - Set WorkingDirectory to package lib dir so ASP.NET Core can locate wwwroot and LanguageService.ctor does not throw ArgumentNullException - Update regression test to assert cookie file path and WorkingDirectory Co-authored-by: naturallaw777 <99053422+naturallaw777@users.noreply.github.com>