updated comments for createEIP712AuthMessageSigner function

[Alison024]

Updates

• Added a note clarifying that domain must match authRequestMsg.app_name.
• Updated the createAuthRequestMessage JSDoc comments to mark scope and application as optional parameters.

Message to the team

Your project is fantastic—truly a potential game-changer for GameFi. I have a couple of suggestions that could make the developer experience even smoother:

1. SDK consistency
   It would help to standardize on a single library for types and signing utilities. The current mix of Viem and ethers@5.7.2 means developers sometimes have to juggle both sets of types.

2. Session-signing guide
   A short external guide on generating and signing session keys/messages would be invaluable for new contributors.

Keep up the great work, and best of luck from the Sentia team!