Replace hatchling and the static version with setuptools + setuptools-scm,
following Kaya's pre-uv packaging setup: dynamic version, generated
_version.py, and release/* tag prefix. The Docker builder now includes git
and the .git directory so the image is versioned from the checkout. CI
checks out full history and tags for the tag-triggered builds.
Gitea Actions workflow triggered by release/* tags: builds the image
with the hostinger runner and pushes
gitea.woggioni.net/woggioni/xmcp:<version> and :latest.
Also document the release process in the README.
woggioni