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/Dockerfile

@@ -21,6 +21,7 @@ WORKDIR /app
 COPY --from=build /app/publish .
 
 ENV ASPNETCORE_URLS=http://+:80
+ENV GW_URL=https://cms.se.kbs1.ir
 EXPOSE 80
 
 ENTRYPOINT ["dotnet", "FrontOffice.Main.dll"]