3.0.0-alpha05

What's new

• Added signed Maven Central publication for the KMP network and preferences
  artifacts under io.github.jeluchu.
• Added automatic Central Portal release to the macOS release workflow.

Improvements

• Kept JitPack for Android artifacts while documenting Maven Central as the
  source of complete Apple KLIB variants.
• Added publication metadata and in-memory signing configuration for network
  and preferences.
• Updated dependency coordinates and consumer documentation for the new
  distribution path.