Copy PolyBackTest?

Build me a SaaS web app like PolyBackTest.

PolyBackTest does: backtest trading bot/ strategies on sub-second historical data for polymarkets up/down markets. Our costs are fixed monthly server costs that scale with usage. Comes with https:kalshibacktest.com (pre It reportedly makes about $8k/mo, so the core idea clearly has demand — I want a lean version I can run and charge for.

Build it from scratch with a modern stack (Next.js + Tailwind + a simple database). Keep it shippable in a weekend.

Requirements:
- Nail the single core loop that PolyBackTest is known for — build that end to end first.
- The main dashboard/workspace where users do the primary task, with sensible empty states.
- Any AI step that makes it feel modern (generate, summarize, or automate the tedious part).
- Data persistence, search/filter, and a clean history/list view.

Also:
- Clean, modern, responsive UI with a thoughtful landing page.
- Email/password auth and a simple paid tier (Stripe test mode) so it's ready to charge.
- A README covering setup, environment variables, and how to deploy.

Ship a working MVP I can run locally first, then help me deploy it.