Repair democloud Nextcloud AIO upgrade

Inspect and repair the Nextcloud AIO upgrade on democloud.kaukus.no. Acceptance criteria: - The intended Nextcloud release is installed with database upgrades complete. - The public Nextcloud endpoint responds normally after the upgrade. - AIO-managed containers are healthy and no upgrade-blocking application errors remain. - The root cause and any disabled or changed components are recorded for handoff. Findings and current state (2026-10-05): - AIO v14.2.0 refreshed all managed images successfully, but the instance remains on Nextcloud 34.0.4 Enterprise. - AIO's supported major-upgrade action ran successfully, but the configured Enterprise update service returned “No update available”; Nextcloud 35 was not installed. - Upstream AIO issue #8700 (“Update all instances to nc35”) remains blocked pending at least Nextcloud 35.0.1 and app/integration validation. Forcing the community release would bypass the configured Enterprise channel and supported AIO rollout. - Disabled files_scripts 5.0.1 because its bundled PSR logger caused fatal WebDAV/Mail errors; no fixed app release is currently available. - Created and validated a local pre-upgrade database/volume recovery snapshot on the host. - Public login/status/WebDAV boundaries respond correctly, maintenance is off, no database upgrade is pending, core integrity passes, and all running AIO containers are healthy. Blocker: wait for the existing-instance Nextcloud 35 rollout and Enterprise update availability, then rerun the AIO major-upgrade action and complete version validation.