fix: add 6492 verification support to lab by using viem + hexlify ethers messages

[tomiir]

Breaking Changes

N/A

Changes

• feat: Adds 6492 signature verification to lab auth middleware by replacing SIWE package validator with a public rpc validate call via viem
• fix: ethers messages not being hexed before sending to provider for signatures, causing "Unable to parse message" and failed signatures for SIWE on ethers.

Notes

• Tests wip

Associated Issues

Closes APKT-345 APKT-302

[linear[bot]]

APKT-345 Issue with SIWE when deploying OP smart account

[vercel[bot]]

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[linear[bot]]

APKT-302 [bug] Ethers - Unable to parse message