Refactor auth type properties to use strong enum type

Changed Type in EndpointAuth and EndpointAuthType in RecActionView from string? to EndpointAuthType? for improved type safety and clarity. This enforces the use of a specific enum for authentication types instead of plain strings.

src/ReC.Domain/Entities/EndpointAuth.cs

@@ -12,7 +12,7 @@ public class EndpointAuth
 
     public string? Description { get; set; }
 
-    public string? Type { get; set; }
+    public EndpointAuthType? Type { get; set; }
 
     public string? ApiKey { get; set; }
 

src/ReC.Domain/Entities/RecActionView.cs

@@ -42,7 +42,7 @@ public class RecActionView
     [ForeignKey("EndpointAuthId")]
     public EndpointAuth? EndpointAuth { get; set; }
 
-    public string? EndpointAuthType { get; set; }
+    public EndpointAuthType? EndpointAuthType { get; set; }
 
     public string? EndpointAuthApiKey { get; set; }