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/deployment/environment_strategy.md

@@ -10,7 +10,7 @@
 ## Configuration
 
 ### appsettings.json Defaults
-- `ResourcesConfig`: ResourcesFolder=`"Content"`, SuiteInstallerFolder=`"suite"`, SuiteStageInstallerFolder=`"suite-stage"`
+- `ResourcesConfig`: ResourcesFolder=`"Content"` (the `SuiteInstallerFolder` / `SuiteStageInstallerFolder` keys were removed in cycle 2 along with the installer endpoints)
 - `JwtConfig`: Issuer=`"AzaionApi"`, Audience=`"Annotators/OrangePi/Admins"`, TokenLifetimeHours=`4`
 - `ConnectionStrings` and `JwtConfig.Secret` are NOT in appsettings — must be provided via environment variables
 
@@ -25,8 +25,6 @@ Configuration is loaded via ASP.NET Core's `IConfiguration` with the following s
 | `JwtConfig.Audience` | Token audience | — |
 | `JwtConfig.TokenLifetimeHours` | Token TTL | — |
 | `ResourcesConfig.ResourcesFolder` | File storage root | — |
-| `ResourcesConfig.SuiteInstallerFolder` | Prod installer dir | — |
-| `ResourcesConfig.SuiteStageInstallerFolder` | Stage installer dir | — |
 
 ## Infrastructure Scripts (`env/`)