Fix: Restrict switchURI() to owner in ERC-721 example

[Pronoss]

What changed? Why?

• Added Ownable import from OpenZeppelin and extended the MyERC721Token contract with Ownable.
• Updated the switchURI() function to be onlyOwner to enforce access control.
• This change ensures only the contract owner can modify the active NFT metadata base URI (BAYC/DOODLES), resolving the security TODO.

[vercel]

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[cb-heimdall]

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[Pronoss]

Hi @wbnns – just a friendly reminder about PR #2240. It updates the ERC-721 example to import Ownable and restricts switchURI() to only the owner. Whenever you get a moment to take a look, I’d appreciate it. Thanks! 🙏