Copy Sprinta.ai?

Build me a Artificial Intelligence web app like Sprinta.ai.

Sprinta.ai does: Ofrecemos diferentes tipos de Saas por suscripción, como herramientas para crear agentes de IA para whatsapp It reportedly makes about $6k/mo, so the core idea clearly has demand — I want a lean version I can run and charge for.

Start from the open-source project wekan/wekan (https://github.com/wekan/wekan) — reuse what fits, strip its branding, and build the specifics below on top of it.

Requirements:
- Boards, lists, and cards (kanban) with drag-and-drop.
- Tasks with assignees, due dates, labels, and comments.
- Multiple projects, filters, and a personal "my tasks" 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.