Adds a logical-dump path so apps with a database can be backed up with zero
downtime and full consistency, instead of stopping the container.
- backup_db.sh: dump each declared DB live (mysqldump --single-transaction /
pg_dump / sqlite3 .backup), exclude the raw data dir from the snapshot, and
replay the dump on restore (pre-start rehydrate for sqlite, post-start load
for server engines).
- Databases are declared via a 'libreportal.backup.db' compose label so the
metadata travels with the app in the snapshot.
- New 'auto' strategy (now the default): live where a DB is dumpable or the app
is marked live-safe, stop-snapshot-start otherwise. Explicit stop/pause/live
remain as overrides.
- restic/borg/kopia adapters honour an exclude list on the live path.
- Manifest records the resolved per-app strategy and dumped databases.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
Signed-off-by: librelad <librelad@digitalangels.vip>
