Faithful prototype-augment split of backup-page.js (2353->753 line base) into
fetch-client, dashboard, snapshots, locations, location-fields, ssh-key,
retention-presets, configuration, engine-details, location-modal,
snapshot-actions, migrate (+ the earlier cron-schedule). Methods relocated
verbatim (mechanical sed/awk extraction, no logic change); all augment
BackupPage.prototype and load after the base via the ordered kernel loader.
Verified: all 99 original methods present exactly once across base+clusters,
no duplicates, all 14 files node --check clean.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Signed-off-by: librelad <librelad@digitalangels.vip>
