golang mysql tmpl or make the tmpl in react

the project are undergoing with pure Golang and Mysql and UI as TMPL and bootstrap 4 I need to separate the project into controllers now it is al in 1 controller file I need all configurations to to be on [login to view URL] file in config directory ( port, db connection, uploaded files and email setup . The new features are: Create Multiple products and/or service orders in the same order. Add Stock Inventory management ( I have all the categories, and brands and the departments ready just need to count my products overall and per sector and categories and show total quantities and Buy price and sold price and the profits ( profits are product selling price - buying price) I need a QR code for each order and each product as well ( I have the add new product page will need the QR code on it and also add the total of products we are adding and minimum to have in stock, I need to add providers that will be users that will see my sectors and categories, subcat, brands, and models of my products, providers will add what they sell per sector, categories, subcategories, brands and models and product name with the price and the description also shipping cost and time for delivery and if there is any available pickup option. I need an order flow management were ( as I revise an order from a client I will process it like ( new order, in preparation in production in finishing, order ready for ( pick up, delivery or installation ), order complete and order reviewed by the client I need to register users and set its types and roles ( if users is a client or provider or Staff of Admin ) there will be more thing to it but for now if we can get those things done would be nice