Split the Dockerfile into a build stage (with headers/compilers) and a
lean app stage with only runtime libraries, and strip binaries on
install. run.sh now defaults to dogecoin-qt:latest when no image is
given.
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01TUDyiicQWXr4XVmuJEXvn3