v0.3.2

The project moved to its own repository and now re-publishes its release
artifacts from there. There are no functional changes to the server.

Changed

• The project now lives at github.com/ZingerLittleBee/next-socks5. The
  container image is published to ghcr.io/zingerlittlebee/next-socks5, and the
  install.sh one-liner, README links, and release/download URLs all point to
  the new location.
• CI build, image, and release jobs run on GitHub-hosted ubuntu-latest
  runners again.