chore: remove v2 Python codebase

Removes all Python source, tests, config examples, CI pipelines,
and build tooling. The Go rewrite replaces everything.

.woodpecker/docker.yaml

@@ -1,18 +0,0 @@
-when:
-  - event: tag
-    ref: refs/tags/v*
-
-steps:
-  - name: docker
-    image: woodpeckerci/plugin-docker-buildx
-    settings:
-      registry: git.unkin.net
-      repo: git.unkin.net/unkin/artifactapi
-      username: droneci
-      password:
-        from_secret: DRONECI_PASSWORD
-      tags:
-        - ${CI_COMMIT_TAG}
-        - latest
-      build_args:
-        - VERSION=${CI_COMMIT_TAG##v}