maxinvesting/CardzCheck — reverse-engineered prompt

Build me a working CardzCheck prototype for sports cards. I want a simple app where someone can look up a card, see recent sold comps, see the current pegged market price, and buy available inventory at that exact price with a connected wallet and test USDC. There should also be an admin side where I can create card SKUs, add sold sales data, compute and sign a peg update, submit that update on chain, mint inventory to the market, and manage any halt or safety behavior if pricing looks wrong.

Please also include a basic collection and portfolio view so a user can see what cards they own and the latest value based on the current peg. Keep the experience clean and easy to click through, not just technically working. Use the existing app, database, and smart contract pieces already in the repo, wire up the env setup, and make sure it runs locally end to end with seeded example data so I can test the full flow. Look up current docs online if you need to.