Refactor interaction and user deletion logic

Consolidated repeated methods for interaction/user deletion into reusable components to improve maintainability. Introduced a `ConfirmDialog` for consistent confirmation UI and streamlined associated logic across pages. Removed redundant methods and enhanced admin-specific page security checks.

FoodsharingSiegen.Server/BaseClasses/FsBase.cs

@@ -31,12 +31,6 @@ namespace FoodsharingSiegen.Server.BaseClasses
         [Inject]
         protected AuthService AuthService { get; set; } = null!;
 
-        /// <summary>
-        ///     Gets or sets the value of the message (ab)
-        /// </summary>
-        [Inject]
-        protected IMessageService Message { get; set; } = null!;
-
         /// <summary>
         ///     Gets or sets the modal service for handling modals within the application
         /// </summary>