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.AdminApi/appsettings.json

@@ -7,9 +7,7 @@
   },
   "AllowedHosts": "*",
   "ResourcesConfig": {
-    "ResourcesFolder": "Content",
-    "SuiteInstallerFolder": "suite",
-    "SuiteStageInstallerFolder": "suite-stage"
+    "ResourcesFolder": "Content"
   },
   "JwtConfig": {
     "Issuer": "AzaionApi",