photos: mule-image cutover to PhotoPrism stack on 120, retire 127

Mulimage 2.0 merge (dtoro/mule-image 70dc1b6) replaces the legacy
FastAPI/Celery/Postgres stack with PhotoPrism + Go sidecar + MariaDB +
SvelteKit. LXC 120 now runs that architecture in production; LXC 127
(the M0 evaluation host) was destroyed in the same session.

- inventory.yaml: drop mule-photos-new host + photos_new service.
- containers/index.md: bump 120's row (6 cores / 12 GiB / iGPU
  passthrough), move 127 to Recently-destroyed.
- containers/120-mule-images.md: rewrite stack + library-access +
  auth sections; add 2026-05-22 cutover changelog entry.
- containers/127-mule-photos-new.md: add closing changelog entry and
  decommission banner; rest left intact as archaeology.
- hosts/mule-photos-new.yaml: removed (regenerated from inventory.yaml).

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

inventory.yaml

@@ -69,9 +69,6 @@ services:
   photos:
     url: https://photos.hubris.network
     backend: mule-images
-  photos_new:
-    url: https://photos-new.hubris.network
-    backend: mule-photos-new
   plato:
     url: https://plato.hubris.network
     backend: plato
@@ -306,14 +303,6 @@ hosts:
     mounts:
     - /mnt/library/documents/plato
     age_pubkey: ''
-  mule-photos-new:
-    kind: lxc
-    pve_id: 127
-    host: hubris
-    os: linux
-    role: photo-management
-    lan_ip: 192.168.8.181
-    public_host: photos-new.hubris.network
   zimaos:
     kind: vm
     pve_id: 100