another fix

src/Backend/DiunaBI.UI.Shared/Extensions/ServiceCollectionExtensions.cs

@@ -8,12 +8,14 @@ public static class ServiceCollectionExtensions
     public static IServiceCollection AddSharedServices(this IServiceCollection services, string apiBaseUrl)
     {
         // HttpClient for API calls
-        services.AddScoped(sp => new HttpClient { BaseAddress = new Uri(apiBaseUrl) });
-        
+        // Ensure BaseAddress ends with / for proper relative URL resolution
+        var baseUri = apiBaseUrl.EndsWith('/') ? apiBaseUrl : apiBaseUrl + "/";
+        services.AddScoped(sp => new HttpClient { BaseAddress = new Uri(baseUri) });
+
         // Services
         services.AddScoped<AuthService>();
         services.AddScoped<LayerService>();
-        
+
         return services;
     }
 }