Fix messy AI-generated code from Lovable app (Next.js/Node)

I used Lovable to generate a full stack MVP for a SaaS platform. It worked fine during prototyping, but now that I'm testing real usage, things are breaking quietly. The APIs don't sync, and payments via Stripe are failing in edge cases. I think the AI generated a bunch of redundant, messy code. Need a real developer to do a quick code audit of my repository, point out why it's breaking, and clean up the database logic. Giving a $10 custom order for the initial diagnosis.