Better Auth Worldcoin Minikit Plugin

The `better-auth-minikit` package provides a plugin for the `better-auth` authentication library, enabling seamless integration with Worldcoin Minikit for Sign-In With Ethereum (SIWE) based authentication flows. It is currently at version 1.0.10, indicating a stable release within its first major iteration. While a specific release cadence isn't stated, the `better-auth` ecosystem generally follows a responsive approach to updates. Key differentiators include its full SIWE implementation adapted for Minikit, robust multi-chain support for associating wallet addresses with specific chain IDs, automatic account linking for verified multiple wallet addresses, and compatibility with MiniApps via secure, partitioned session cookies (SameSite: "none"). It abstracts much of the SIWE complexity for `better-auth` users, focusing on secure server-side nonce generation and message verification, along with a client-side API for initiating the flow.