maimounadiallo4/StackArchitect ? reverse-engineered prompt

Build me a guided web app that helps people figure out their tech stack one step at a time and turns their choices into a clean architecture diagram.

I want the experience to feel simple and friendly, like answering a few questions about what I am building, then choosing things like frontend, backend, database, auth, payments, AI, and infrastructure as needed. The app should adapt the questions based on the type of project, so a SaaS app asks about payments and an API only project does not force a frontend. It should show a nice visual diagram with real logos, label each part clearly, and connect everything automatically.

Please include live checks that point out obvious problems, like missing pieces or awkward combinations, and let me export the result as a diagram image and a few useful text formats. Make it work in English and French, support light and dark mode, and keep it as a fast static app with no backend or account required.