Epic: LikeCoin migration

[zeckli]

Description

• LikeChain is moving from the Cosmos ecosystem to Base, and the original LIKE will be invalid after the migration window closes. To continue supporting LIKE donations, we should update the related contracts, frontend and backend services.

Stories

• Story: update backend services for supporting LIKE on Base #533
• Story: create and deploy contracts for Base #532
• Story: frontend UI changes #534