another fix

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

@@ -8,7 +8,9 @@ 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>();

src/Backend/DiunaBI.UI.Web/Program.cs

@@ -14,8 +14,6 @@ var apiBaseUrl = builder.Configuration["ApiSettings:BaseUrl"]
                  ?? throw new InvalidOperationException("ApiSettings:BaseUrl is not configured");
 builder.Services.AddSharedServices(apiBaseUrl);
 
-builder.Services.AddScoped<AuthService>();
-
 var app = builder.Build();
 
 if (!app.Environment.IsDevelopment())