Reshape the dashboard's Backup status grid into a click-to-pick UI:
- Removed the inline Back-up / Restore buttons from the System config
tile. Same shape as an app tile now; LibrePortal app icon instead of
the server-stack glyph.
- Grid is 2 columns (was auto-fill min 220px). Tiles are wider, read
better, and the System tile no longer needs to span a full row to fit
inline buttons.
- Click any tile (System or app) → opens a new "Back up" modal:
* System config first (key=__system__, LibrePortal icon)
* Every installed app, alphabetical
* Checkbox per row + 'Select all' / 'Clear' shortcuts
* The tile clicked is pre-ticked
- Confirm queues backup tasks:
* Everything ticked → single `libreportal backup all` (which also
runs `backup system`) — one task instead of N
* Subset → one task per ticked item (`backup system`
and/or `backup app create <slug>`)
Restore for System config used to live on the dashboard's inline
'Restore' button. It's now reachable via the Backups tab — system
snapshots appear in the snapshot list with the standard per-row
Restore action — same path apps already use. No new UI required;
just one fewer dashboard button.
Signed-off-by: librelad <librelad@digitalangels.vip>
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