This commit introduces the `[ApiExplorerSettings(IgnoreApi = true)]` attribute to various DTO classes to exclude them from API documentation. The `using Microsoft.AspNetCore.Mvc;` directive has been added to several files to support ASP.NET Core MVC features.
Additionally, comments in `HistoryController.cs` have been reformatted for clarity, and `LocalizationController.cs` has been updated with standard API controller attributes. These changes improve code organization and maintain cleaner API documentation.
- `[EmailAddress]`-Attribut auf `EmailAddress` in `ReceiverCreateDto` angewendet, um das E-Mail-Format zu validieren.
- `ModelState.IsValid`-Überprüfung zur `Create`-Methode hinzugefügt, um Validierungsfehler vor dem Aufruf der Basis-`Create`-Methode zu behandeln.