Refactor term-related settings into a dedicated class

Extracted term-related properties from AppSettings to a new TermSettings class for improved organization and separation of concerns. Updated appsettings.json to reflect the new structure.

FoodsharingSiegen.Contracts/Model/AppSettings.cs

@@ -3,27 +3,8 @@
     public class AppSettings
     {
         #region Public Properties
-
-        /// <summary>
-        ///     Gets or sets the name of the "StepIn."
-        ///     This property typically represents the label or identifier used for a specific feature
-        ///     or section within the application.
-        /// </summary>
-        public string? StepInName { get; set; } = "StepIn";
-
-        /// <summary>
-        ///     Gets or sets the title of the application.
-        ///     This property holds the display name or title of the application,
-        ///     which may be used for branding purposes in various parts of the UI.
-        /// </summary>
-        public string? Title { get; set; } = "Foodsharing Musterhausen";
-
-        /// <summary>
-        ///     Gets or sets the title displayed in the sidebar.
-        ///     This property represents the text that appears in the application's sidebar,
-        ///     typically used for informational or navigational purposes.
-        /// </summary>
-        public string? TitleShort { get; set; }
+        
+        public TermSettings Terms { get; set; } = new();
 
         #endregion
     }