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.

examples/router/src/Examples.Gateway/Program.cs

@@ -0,0 +1,53 @@
+using StellaOps.Gateway.WebService;
+using StellaOps.Gateway.WebService.Authorization;
+using StellaOps.Gateway.WebService.Middleware;
+using StellaOps.Router.Config;
+using StellaOps.Router.Transport.InMemory;
+
+var builder = WebApplication.CreateBuilder(args);
+
+// Router configuration from YAML
+builder.Services.AddRouterConfig(options =>
+{
+    options.ConfigPath = "router.yaml";
+    options.EnableHotReload = true;
+});
+
+// Gateway routing services
+builder.Services.AddGatewayRouting(builder.Configuration);
+
+// In-memory transport for demo (can switch to TCP/TLS for production)
+builder.Services.AddInMemoryTransport();
+
+// Authority integration (no-op for demo)
+builder.Services.AddNoOpAuthorityIntegration();
+
+var app = builder.Build();
+
+// Middleware pipeline
+app.UseForwardedHeaders();
+app.UseMiddleware<PayloadLimitsMiddleware>();
+app.UseAuthentication();
+app.UseMiddleware<EndpointResolutionMiddleware>();
+app.UseClaimsAuthorization();
+app.UseMiddleware<RoutingDecisionMiddleware>();
+
+// Simple health endpoint
+app.MapGet("/health", () => Results.Ok(new { status = "healthy" }));
+
+// Catch-all for routed requests
+app.MapFallback(async context =>
+{
+    // The RoutingDecisionMiddleware would have dispatched the request
+    // If we reach here, no route was found
+    context.Response.StatusCode = 404;
+    await context.Response.WriteAsJsonAsync(new { error = "Not Found", message = "No matching endpoint" });
+});
+
+app.Run();
+
+// Partial class for WebApplicationFactory integration testing
+namespace Examples.Gateway
+{
+    public partial class Program { }
+}