Add Flow EVM as a supported network

[chasefleming]

Description

Adds Flow EVM (mainnet) as a supported network.

Summary of Changes

• Updated typescript/packages/x402/src/types/shared/evm/config.ts
• Updated typescript/packages/x402/src/types/shared/network.ts
• Updated typescript/packages/x402/src/types/shared/evm/wallet.ts

Tests

Checklist

• I have formatted and linted my code
• All new and existing tests pass
• My commits are signed (required for merge) -- you may need to rebase if you initially pushed unsigned commits

[cb-heimdall]

🟡 Heimdall Review Status

Requirement	Status	More Info
Reviews	🟡 0/1	Denominator calculation Show calculation 1 if user is bot 0 1 if user is external 0 2 if repo is sensitive 0 From .codeflow.yml 1 Additional review requirements Show calculation Max 0 0 From CODEOWNERS 0 Global minimum 0 Max 1 1 1 if commit is unverified 0 Sum 1

[vercel]

@chasefleming is attempting to deploy a commit to the Coinbase Team on Vercel.

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