Prestashop Update

Here are the details of the project: Current Version: PrestaShop 8.0.4 Target Version: The latest stable version of PrestaShop (9.x) Current Theme: Warehouse Theme (needs to be upgraded to the latest version compatible with PrestaShop 9.x) Modules: All current modules need to be updated to be fully compatible with the new PrestaShop and PHP version. Language: The front-end must remain in Danish, just like it is now. Front-end Design: The look, feel, and layout of the front-end must remain identical to the current site after the upgrade. Important requirement:The entire upgrade, theme update, and module testing must be done on a staging/development environment first. Once everything is fully tested, working, and approved by me, it can be deployed to the live server. Could you please provide a fixed price proposal and an estimated timeframe for this job?