feat: add health check endpoint, file upload result handling, and Playwright E2E tests

- Add /health endpoint with anonymous access for monitoring
- Add FileUploadResult<T> model and PostMultipartForFileResultAsync for proper upload response handling
- Add ApiResult.Success() factory method for interface types
- Refactor Login.razor for cleaner code
- Add comprehensive Playwright E2E test suite with fixtures and helpers

NEW/src/JdeScoping.Api/DependencyInjection.cs

@@ -8,6 +8,7 @@ using Microsoft.AspNetCore.Builder;
 using Microsoft.AspNetCore.Http;
 using Microsoft.Extensions.Configuration;
 using Microsoft.Extensions.Hosting;
+using Microsoft.AspNetCore.Diagnostics.HealthChecks;
 using Microsoft.OpenApi.Models;
 
 namespace Microsoft.Extensions.DependencyInjection;
@@ -113,6 +114,12 @@ public static class ApiDependencyInjection
         app.MapControllers();
         app.MapHub<StatusHub>("/hubs/status");
 
+        // Health check endpoint - no authentication required
+        app.MapHealthChecks("/health", new HealthCheckOptions
+        {
+            AllowCachingResponses = false
+        }).AllowAnonymous();
+
         return app;
     }
 }