Fix static files and CSS asset reference for SignalR sample

- Fix middleware order: UseAntiforgery must be between UseRouting and UseEndpoints
- Add UseStaticFiles() to serve wwwroot content
- Fix scoped CSS bundle reference: use lowercase 'electronnet-samples-blazorsignalr.styles.css' to match generated asset name
- Add HTTP request logging for debugging
- Enable detailed logging for routing and static files in development

src/ElectronNET.Samples.BlazorSignalR/appsettings.Development.json

@@ -2,7 +2,9 @@
   "Logging": {
     "LogLevel": {
       "Default": "Information",
-      "Microsoft.AspNetCore": "Warning",
+      "Microsoft.AspNetCore": "Debug",
+      "Microsoft.AspNetCore.Routing": "Debug",
+      "Microsoft.AspNetCore.StaticFiles": "Debug",
       "Microsoft.AspNetCore.SignalR": "Debug",
       "Microsoft.AspNetCore.Http.Connections": "Debug"
     }