Persist zoxide directory history across container recreations

Zoxide stores its database at ~/.local/share/zoxide/db.zo. Without a
named volume, the 'z <fragment>' jump targets are lost on every
'docker compose up --force-recreate'.

Add devbox-zoxide named volume in docker-compose.yml and
docker-compose.shared.yml, add ~/.local/share/zoxide to the
entrypoint ownership-fix loop per AGENTS.md convention, and update
the data-persistence tables in README.md and DOCKER_HUB.md.

entrypoint.sh

@@ -77,6 +77,7 @@ for dir in \
   /home/"$USER_NAME"/.local/share/opencode \
   /home/"$USER_NAME"/.local/state/opencode \
   /home/"$USER_NAME"/.local/share/uv \
+  /home/"$USER_NAME"/.local/share/zoxide \
   /home/"$USER_NAME"/.cache/bash \
   /home/"$USER_NAME"/.rustup \
   /home/"$USER_NAME"/.cargo \