Feature: Support ERC-2612 (permit) for Gasless Token Approvals

[pali101]

Description

Add support for EIP-2612 permit so that users can create payment channels for ERC-20 tokens without a prior on-chain approve transaction. This allows gasless approval with a signed message, improving user experience and reducing friction.

Acceptance Criteria

• Implement createChannelWithPermit() function
• Accepts permit signature parameters and calls the token’s permit() before transferring tokens
• Reverts with a custom error DepositWithPermitNotSupportedForNative() if used with Native token
• Fully tested with USDFC (EIP-2612 compliant token)

Reference

• EIP-2612