chore: enhance configuration for gateway URL handling

- Added GW_URL and GwUrl environment variables in frontoffice-deployment.yaml and Dockerfile for consistent gateway URL configuration.
- Updated AddGrpcServices method to resolve gateway URL from both environment variables, ensuring proper error handling for missing values.
- Modified TokenNotificationService to prioritize GW_URL over GwUrl for improved configuration flexibility.

src/FrontOffice.Main/ConfigureServices.cs

@@ -100,7 +100,8 @@ public static class ConfigureServices
 
     public static IServiceCollection AddGrpcServices(this IServiceCollection services, IConfiguration configuration)
     {
-        var baseUrl = configuration["GwUrl"];
+        var baseUrl = ResolveGatewayUrl(configuration)
+            ?? throw new InvalidOperationException("Gateway URL is missing. Set GW_URL or GwUrl.");
 
         // Register optimized HttpClient for gRPC
         services.AddScoped(sp =>
@@ -152,6 +153,15 @@ public static class ConfigureServices
         return services;
     }
 
+    private static string? ResolveGatewayUrl(IConfiguration configuration)
+    {
+        var envUrl = configuration["GW_URL"];
+        if (!string.IsNullOrWhiteSpace(envUrl))
+            return envUrl.TrimEnd('/');
+
+        return configuration["GwUrl"]?.TrimEnd('/');
+    }
+
     private static TClient CreateAuthenticatedClient<TClient>(IServiceProvider sp)
         where TClient : class
     {