fix: Adjust route constraint to handle URL generation without HttpContext and update route order for Razor Pages

framework/src/Volo.Abp.AspNetCore.Mvc/Volo/Abp/AspNetCore/Mvc/Localization/AbpCultureRouteConstraint.cs

@@ -23,11 +23,12 @@ public class AbpCultureRouteConstraint : IRouteConstraint
         }
 
         var languages = httpContext?.RequestServices
-            .GetRequiredService<IOptions<AbpLocalizationOptions>>().Value.Languages;
+            .GetService<IOptions<AbpLocalizationOptions>>()?.Value.Languages;
 
         if (languages == null || languages.Count == 0)
         {
-            return false;
+            // During URL generation, HttpContext or services may not be available.
+            return routeDirection == RouteDirection.UrlGeneration;
         }
 
         return languages.Any(l =>

framework/src/Volo.Abp.AspNetCore.Mvc/Volo/Abp/AspNetCore/Mvc/Localization/AbpCultureRoutePagesConvention.cs

@@ -34,7 +34,7 @@ public class AbpCultureRoutePagesConvention : IPageRouteModelConvention
                 AttributeRouteModel = new AttributeRouteModel
                 {
                     Template = AttributeRouteModel.CombineTemplates(CultureRouteTemplate, originalTemplate),
-                    Order = 1
+                    Order = -1
                 }
             });
         }