handle /setup when store is published

The store setup page is no longer accessible once a store has completed setup; visiting it now returns a 404 instead.

How it benefits the Merchant

Reduces security risk by preventing accidental or malicious access to setup configuration on a live store.

Potential FAQs

Q: Will this affect my ability to change store settings later?

A: No — it only blocks the initial setup page after setup is complete; other settings pages are unaffected.

Q: What happens if someone visits the old /setup URL?

A: They will now see a 404 page instead of the setup flow.