Refactor authentication logic to use appsettings configuration. Add settings helpers, example config file, and dynamic API base URL support.

Helper/AuthHelper.cs

@@ -63,6 +63,7 @@ public static class AuthHelper
         
         // Try to load CSRF token from file
         var csrfToken = await LoadCsrfTokenAsync();
+        csrfToken = null;
 
         // If no valid token found, call login endpoint to get a new one
         if (string.IsNullOrWhiteSpace(csrfToken))

Helper/Settings.cs

@@ -0,0 +1,77 @@
+using Microsoft.Extensions.Configuration;
+
+namespace FsTool.Helpers
+{
+    /// <summary>
+    ///     Represents the root configuration settings for the application, including API and credentials.
+    /// </summary>
+    public class AppSettings
+    {
+        /// <summary>
+        ///     Gets the API-related settings.
+        /// </summary>
+        public ApiSettings Api { get; init; } = new();
+
+        /// <summary>
+        ///     Gets the credentials settings for authentication.
+        /// </summary>
+        public CredentialsSettings Credentials { get; init; } = new();
+    }
+
+    /// <summary>
+    ///     Contains settings related to the API endpoints.
+    /// </summary>
+    public class ApiSettings
+    {
+        /// <summary>
+        ///     Gets the base URL for the API, without the /api path segment.
+        /// </summary>
+        public string BaseUrl { get; init; } = "https://beta.foodsharing.de";
+    }
+
+    /// <summary>
+    ///     Contains credentials and authentication settings.
+    /// </summary>
+    public class CredentialsSettings
+    {
+        /// <summary>
+        ///     Gets the email address used for login.
+        /// </summary>
+        public string Email { get; init; } = string.Empty;
+
+        /// <summary>
+        ///     Gets the password used for login.
+        /// </summary>
+        public string Password { get; init; } = string.Empty;
+
+        /// <summary>
+        ///     Gets a value indicating whether two-factor authentication is enabled.
+        /// </summary>
+        public bool TwoFactorEnabled { get; init; }
+    }
+
+    /// <summary>
+    ///     Provides access to the current application settings loaded from configuration.
+    /// </summary>
+    public static class SettingsProvider
+    {
+        private static AppSettings? _current;
+
+        /// <summary>
+        ///     Gets the current application settings instance.
+        /// </summary>
+        public static AppSettings Current => _current ??= Load();
+
+        private static AppSettings Load()
+        {
+            var configuration = new ConfigurationBuilder()
+                .SetBasePath(AppContext.BaseDirectory)
+                .AddJsonFile("appsettings.json", optional: false, reloadOnChange: true)
+                .Build();
+
+            var settings = new AppSettings();
+            configuration.Bind(settings);
+            return settings;
+        }
+    }
+}