docs: add mainnet migration checklist

[MuncleUscles]

Summary

• Adds a mainnet preparation checklist to the Networks page for existing apps moving from Studionet/testnet to a future production environment.
• Clarifies that builders should redeploy contracts, update frontend/backend configuration, regenerate fee estimates, and plan for fee-funded compute.

Sanitized evidence basis

• Recent community discussion asked whether apps already deployed on Studionet/testnet will continue working after mainnet and what app owners need to change.
• The current Networks page listed environments and endpoints but did not spell out the app migration checklist or production fee assumptions.

Test plan

• pnpm build — passed.

Created by weekly docs-and-skills gap loop; draft for human review.

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