zckly/create-t3-turbo-ai ? reverse-engineered prompt

Build me a starter repo for making AI powered web apps, using a monorepo setup with a Next.js web app and shared packages for the API, auth, and database. I want a clean basic app that already wires together a typed backend and frontend, user sign in, Prisma database access, and one simple OpenAI plus LangChain example so I can send a prompt and see a response in the UI.

Use Tailwind for a simple polished interface, keep the code organized so prompts can be expanded later, and make local setup easy with env vars from the example file. For local development, default to sqlite, but keep it easy to switch to postgres for deployment. Please make sure the app can run after install, env setup, and db push, and leave short notes on how to start it and deploy the Next.js app. Look up current docs online if you need to.