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

jellyfin/node-exporter/docker-compose.yml

@@ -0,0 +1,15 @@
+services:
+  node-exporter:
+    image: prom/node-exporter:latest
+    container_name: node-exporter
+    restart: unless-stopped
+    network_mode: host
+    pid: host
+    volumes:
+      - /proc:/host/proc:ro
+      - /sys:/host/sys:ro
+      - /:/rootfs:ro
+    command:
+      - '--path.procfs=/host/proc'
+      - '--path.sysfs=/host/sys'
+      - '--collector.filesystem.mount-points-exclude=^/(sys|proc|dev|host|etc)($$|/)'