Migrate lenpaste Docker image to the new build-time config architecture.
- rootfs/root/docker/setup/03-files.sh: rewrite to canonical form with /tmp/bin, /tmp/var, /tmp/etc, /tmp/usr handlers; remove template-files copy block; add WTFPL header, single shellcheck disable, vim modeline
rootfs/root/docker/setup/03-files.sh
Aligns README install/run snippets with the new convention split:
rootfs/ for Dockerfile-build content (image filesystem), volumes/
for docker-compose host bind-mounts. Compose mounts, host bind
paths, and runtime data dirs are renamed; Dockerfile COPY/ADD
sources (where present) are preserved.
README.md