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/Extensions/StreamExtensions.cs

@@ -1,15 +0,0 @@
-using System.Text;
-
-namespace Azaion.Common.Extensions;
-
-public static class StreamExtensions
-{
-    public static string ConvertToString(this Stream stream)
-    {
-        stream.Position = 0;
-        using var reader = new StreamReader(stream, Encoding.UTF8);
-        var result = reader.ReadToEnd();
-        stream.Position = 0;
-        return result;
-    }
-}