Add unit tests for Router configuration and transport layers

- Implemented tests for RouterConfig, RoutingOptions, StaticInstanceConfig, and RouterConfigOptions to ensure default values are set correctly.
- Added tests for RouterConfigProvider to validate configurations and ensure defaults are returned when no file is specified.
- Created tests for ConfigValidationResult to check success and error scenarios.
- Developed tests for ServiceCollectionExtensions to verify service registration for RouterConfig.
- Introduced UdpTransportTests to validate serialization, connection, request-response, and error handling in UDP transport.
- Added scripts for signing authority gaps and hashing DevPortal SDK snippets.

src/__Libraries/StellaOps.Microservice/RequestDispatcher.cs

@@ -2,6 +2,7 @@ using System.Text.Json;
 using Microsoft.Extensions.DependencyInjection;
 using Microsoft.Extensions.Logging;
 using StellaOps.Router.Common.Frames;
+using StellaOps.Router.Common.Models;
 
 namespace StellaOps.Microservice;
 
@@ -116,6 +117,13 @@ public sealed class RequestDispatcher
         RawRequestContext context,
         CancellationToken cancellationToken)
     {
+        // Ensure handler type is set
+        if (endpoint.HandlerType is null)
+        {
+            _logger.LogError("Endpoint {Method} {Path} has no handler type", endpoint.Method, endpoint.Path);
+            return RawResponse.InternalError("No handler configured");
+        }
+
         // Get handler instance from DI
         var handler = scopedProvider.GetService(endpoint.HandlerType);
         if (handler is null)