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>

_docs/02_document/modules/services_auth_service.md

@@ -27,7 +27,7 @@ Private method:
 
 ## Consumers
 - `Program.cs` `/login` endpoint — calls `CreateToken` after successful validation
-- `Program.cs` `/users/current`, `/resources/get`, `/resources/get-installer`, `/resources/check` — call `GetCurrentUser`
+- `Program.cs` `/users/current` — calls `GetCurrentUser` (the previously listed `/resources/get`, `/resources/get-installer`, `/resources/check` consumers were removed in cycle 2 / by AZ-197 along with their endpoints)
 
 ## Data Models
 None.