v0.0.6 of zklogin_dart

Sui zkLogin Dart SDK for deriving zkLogin addresses, generating ephemeral nonces, and building zkLogin signatures from OAuth/OIDC JWTs. Changelog excerpt: - Migrated the package to scallop-io/zklogin-dart. - Vendored the Poseidon hash implementation into lib/src/poseidon, removing the accidental Flutter SDK dependency. The package is now pure Dart and supports all platforms. - Upgraded to sui_dart ^0.5.0and raised the Dart SDK lower bound to ^3.11.0. - Removed the pointycastledependency override (now resolved transitively via sui_dart). - Migrated lints from flutter_lintsto the pure-Dart `l[...]