LLMs are probably the worst tool for the job. Code generators have been a thing forever. Why use a LLM when you can do "npm create vite@latest my-vue-app -- --template vue" ?
It's always more tedious than that. You have to pick all these libraries, install and set them up, build login pages, etc. Stuff that is all simple work but takes ages. I've never used an LLM for it but it seems like the kind of work that should be easy enough to automate and would save a week of setting everything up if it worked.