Adds a secondary erasure-coded (2+1, failureDomain host) data pool 'bulk' to the cephfs filesystem and a ceph-filesystem-bulk StorageClass targeting it. data0 stays the default data pool, as Rook requires for EC CephFS pools. Bulk media at 1.5x instead of 3x raw overhead. Behaviour matches the existing migration.rgw.buckets.data EC pool: Rook sets ec_overwrites, min_size 2 (=k), so IO continues through a single-node reboot without redundancy for that window. Also provisions an empty audiobookshelf-books-bulk PVC on the new class. Deployment and libation CronJob still mount audiobookshelf-books; the data copy and cutover follow separately. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>