Unraid: container recovery after reboot, Nextcloud 35, image updates

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

docs/CHANGELOG.md

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 **Purpose:** Major infrastructure events only. Minor changes are in git commit messages.
 
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+## 2026-10-10
+
+### Unraid: container recovery after reboot, Nextcloud 33 → 35, image updates
+- **[DOCKER]** After the 13:20 reboot only 14/66 containers were running. 24 containers had been recreated but not started (Traefik, AdGuard, Gitea, PostgreSQL 17, Redis, Nextcloud and others). Started them in dependency order. Now 36/66 running.
+- **[DOCKER]** Nextcloud upgraded 33.0.3 → 34 → 35.0.1 (one major per step). Backup in `/mnt/cache/appdata/nextcloud/backup-2026-10-10/`. `custom_apps` chown → 33:33.
+- **[DOCKER]** Updated: arcane, immich (server + ML), obsidian-livesync, rdt-client, zurg, zurg-rclone, unimus, woodpecker-agent.
+- **[NOTE]** `dockge` and `Home-Assistant-Container` are in autostart but do not exist. authentik, vaultwarden and *arr are stopped since 2026-10-08 and wait for a decision.
+
+---
+
 ## 2026-08-07
 
 ### Floorplan: photorealistic background v3 — per-room Gemini API generation (final)