feat(workflow): Gitea-Wiki als generierter Spiegel von docs/ (#192)

Konverter .gitea/scripts/wiki_mirror.py, Push-Skript wiki-push.sh, Job wiki-mirror in release.yml, Dispatch-Workflow wiki-mirror.yml und --check-Schritt in ci.yml. Version 9.0.0-beta.13.

Files changed:
- .gitea/scripts/wiki-push.sh
- .gitea/scripts/wiki_mirror.py
- .gitea/workflows/ci.yml
- .gitea/workflows/release.yml
- .gitea/workflows/wiki-mirror.yml
- CHANGES.md
- README.md
- VERSION
- docs/dev/development.md
- tools/chemenu/tests/test_wiki_mirror.py

Co-Authored-By: Claude Code <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01SnAJ7Z3CpVD3PRbN73QtU2

README.md

@@ -59,6 +59,11 @@ Most days you need three of the how-to guides: [ingest a source](docs/how-to/ing
 [query the wiki](docs/how-to/query-the-wiki.md) and [maintain it](docs/how-to/maintain-the-wiki.md).
 How the parts fit together is [docs/explanation/architecture.md](docs/explanation/architecture.md).
 
+<!-- dist:strip-start -->
+The Gitea wiki of this repository shows these pages for the latest release. It is generated from
+`docs/` and not edited; how it is built is in [docs/dev/development.md](docs/dev/development.md).
+<!-- dist:strip-end -->
+
 ## Your first ingestion
 
 Once the instance runs, [From your first source to your first answer](docs/tutorials/first-source-to-first-answer.md)