backup classification: backup: blocks for the 13 bind-bearing apps

Adds the referential-coupling backup: block to every app that binds
${HDD_PATH}/${USERDATA_PATH} (immich, paperless-ngx, nextcloud, calibre-web,
audiobookshelf, komga, navidrome, radarr, sonarr, emby, jellyfin, plex, romm).
Each lists its userdata:/hdd: binds with class mandatory|optional|excluded
(operator-ruled + spike SQ2).

Requires controller v0.132.0 (deployed) which parses+validates these blocks.
INERT — no backup tier changes behavior yet (Task 3/4 consume it). All 13
verified against the shipped parser: parse-clean, every bind resolves explicit.
audiobookshelf media/audiobooks = optional (PENDING Viktor veto to excluded).

Ref: felhom.eu/documentation/audits/SPIKE-backup-classification-2026-07-14.md
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# Changelog
## 2026-07-14 — backup classification `backup:` blocks for the 13 bind-bearing apps (controller v0.132.0)
Adds the referential-coupling `backup:` classification block to every catalog app that binds
`${HDD_PATH}`/`${USERDATA_PATH}` (13 apps: immich, paperless-ngx, nextcloud, calibre-web,
audiobookshelf, komga, navidrome, radarr, sonarr, emby, jellyfin, plex, romm). Each block lists its
`userdata:`/`hdd:` binds with a `class ∈ {mandatory, optional, excluded}` (COUPLED /
DECOUPLED-precious / DECOUPLED-bulk); classes are operator-ruled (Viktor, 2026-07-14) + spike SQ2.
Requires **controller v0.132.0**, which parses + validates these blocks (Task 2 of the
backup-classification-redesign arc, `felhom.eu/documentation/audits/SPIKE-backup-classification-2026-07-14.md`).
The classification is **INERT** — no backup tier changes behavior yet; Task 3 (tier policy engine)
and Task 4 (manual `.fab` UI) consume it. All 13 blocks were verified against the shipped controller
parser: parse-clean, every bind resolves `explicit` to its ruled class (zero validation errors).
Notes: audiobookshelf `media/audiobooks` = **optional** (consistency with komga/romm curated media;
the spike proposed excluded — PENDING a Viktor veto). radarr/sonarr `downloads` = excluded (transient
cross-app queue). emby/jellyfin/plex `media` = excluded (`:ro` readers; state in volumes). The 42
volume-only apps get no block (classification moot — state rides in the recovery unit's volume dumps).
## 2026-07-12 — image pinning sweep: `:latest` eliminated from all templates (5 pins) + standing gate
A catalog sweep found 5/53 templates with unpinned images. Beyond version discipline, `:latest`