refactor: remove obsolete resource download and installer endpoints

- Deleted the `POST /resources/get/{dataFolder?}` and `GET /resources/get-installer` endpoints as part of the architectural shift towards simplified resource management.
- Removed associated methods and configurations, including `ResourcesService.GetEncryptedResource`, `ResourcesService.GetInstaller`, and related properties in `ResourcesConfig`.
- Cleaned up environment variables and configuration files to reflect the removal of installer-related settings.
- Eliminated the `GetResourceRequest` DTO and its validator, along with the `WrongResourceName` error code.
- Updated documentation to clarify the changes in resource handling and the retirement of per-user file encryption.

Co-authored-by: Cursor <cursoragent@cursor.com>

Azaion.Common/BusinessException.cs

@@ -39,9 +39,6 @@ public enum ExceptionEnum
     [Description("User account is disabled.")]
     UserDisabled = 38,
 
-    [Description("Wrong resource file name.")]
-    WrongResourceName = 50,
-
     [Description("No file provided.")]
     NoFileProvided = 60,
 }