Three bugs prevented backups stored on remote disks (Dropbox, S3, etc.)
from ever appearing in the Settings > Backup listing:
1. Typo in BackupSetting.vue: `filed_disk_id` was sent to the API
instead of `file_disk_id`, so the backend never received the selected
disk ID and always fell back to the local filesystem.
2. Wrong default disk selection in loadDisksData(): `set_as_default == 0`
selected the first disk that is NOT default (local_public), instead of
the disk that IS default. Changed to `set_as_default == 1` with a
fallback to the first disk.
3. BackupsController::index() did not call setConfig() on the FileDisk
before querying backups, so even when the correct file_disk_id arrived
it still read from the default local filesystem. Added the same disk
bootstrap logic already present in CreateBackupJob and destroy().
Made-with: Cursor
