Refactor SAML configuration deployment and enhance Authentik integration

- Removed SAML configuration deployment calls from PostInstanceInitService.
- Updated DeploySamlConfigurationAsync to improve template fetching logic from Git and local directories.
- Added Authentik flow and keypair models for better representation in the UI.
- Enhanced SettingsViewModel to include Authentik settings with save and test functionality.
- Updated UI to support Authentik configuration, including dropdowns for flows and keypairs.
- Changed default CMS server name template to "app.ots-signs.com" across various files.
- Improved password handling in SshDockerCliService for secure shell command execution.
- Added new template file for settings-custom.php in the project structure.

OTSSignsOrchestrator.Core/Configuration/AppOptions.cs

@@ -82,7 +82,7 @@ public class InstanceDefaultsOptions
     public string? TemplateRepoPat { get; set; }
 
     /// <summary>Template for CMS server hostname. Use {abbrev} as placeholder.</summary>
-    public string CmsServerNameTemplate { get; set; } = "{abbrev}.ots-signs.com";
+    public string CmsServerNameTemplate { get; set; } = "app.ots-signs.com";
 
     public string SmtpServer { get; set; } = string.Empty;
     public string SmtpUsername { get; set; } = string.Empty;