Sync workspace with Gitea: merge June/July session docs

- README + siklos-docker-services: add authentik/searxng/beszel rows, photos VM section,
  2026-06-24 cleanup notes, 2026-07-03 Portainer conversion note (jgpc naming preserved)
- Add: authentik setup docs, frigate docs/config, OCIS migration docs, AdventureLog bug
  report, install-native-apps.sh, workstation-disk-analysis.md
- Remove obsolete: cgitta-nextcloud-zip-analysis.md, kopia-restore-guide.md
- .gitignore: ocis-credentials.md (secrets stay local), *.bak

.gitignore

@@ -2,3 +2,6 @@ credentials.md
 kopia-docker-compose-fixed.yml
 *.secret
 *.env
+ocis-credentials.md
+*.bak
+*.bak2