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

jgpc/open-webui/docker-compose.yml

@@ -1,25 +0,0 @@
-services:
-  open-webui:
-    image: ghcr.io/open-webui/open-webui:main
-    container_name: open-webui
-    network_mode: host
-    restart: always
-    volumes:
-      - open-webui:/app/backend/data
-    environment:
-      - OLLAMA_BASE_URL=http://127.0.0.1:11434
-      - PORT=8080
-      - SCARF_NO_ANALYTICS=true
-      - DO_NOT_TRACK=true
-      - ANONYMIZED_TELEMETRY=false
-      - WHISPER_MODEL=base
-      - DOCKER=true
-    healthcheck:
-      test: ["CMD-SHELL", "curl --silent --fail http://localhost:8080/health || exit 1"]
-      interval: 30s
-      timeout: 10s
-      retries: 3
-
-volumes:
-  open-webui:
-    external: true