chore: prepare 2.0.0 release

[regulusleow]

Summary

• publish the cross-platform Swift and Kotlin protocol contracts as 2.0.0
• keep English and localized package documentation aligned
• include the reviewed dependency lock update

Verification

• npm test
• swift test --parallel
• swift build -c release
• ./gradlew --no-configuration-cache :AstrolabeProtocolKotlin:test :AstrolabeProtocolKotlin:publishToMavenLocal