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/Requests/GetResourceRequest.cs

@@ -1,25 +0,0 @@
-using FluentValidation;
-
-namespace Azaion.Common.Requests;
-
-public class GetResourceRequest
-{
-    public string Password { get; set; } = null!;
-    public string FileName { get; set; } = null!;
-}
-
-public class GetResourceRequestValidator : AbstractValidator<GetResourceRequest>
-{
-    public GetResourceRequestValidator()
-    {
-        RuleFor(r => r.Password)
-            .MinimumLength(8)
-            .WithErrorCode(nameof(ExceptionEnum.PasswordLengthIncorrect))
-            .WithMessage(_ => BusinessException.GetMessage(ExceptionEnum.PasswordLengthIncorrect));
-
-        RuleFor(r => r.FileName)
-            .NotEmpty()
-            .WithErrorCode(nameof(ExceptionEnum.WrongResourceName))
-            .WithMessage(_ => BusinessException.GetMessage(ExceptionEnum.WrongResourceName));
-    }
-}