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>

hosts/mule-photos-new.yaml

@@ -1,26 +0,0 @@
-# Generated by mcp/build_host_files.py from inventory.yaml.
-# Do NOT edit by hand — your changes will be overwritten.
-# Source of truth: ../inventory.yaml
-name: mule-photos-new
-kind: lxc
-os: linux
-role: photo-management
-host: hubris
-pve_id: 127
-lan_ip: 192.168.8.181
-mesh_globals:
-  primary: netbird
-  accepted:
-  - netbird
-  - tailscale
-public_host: photos-new.hubris.network
-runs:
-- photos_new
-services_hosted:
-- name: photos_new
-  url: https://photos-new.hubris.network
-  backend: mule-photos-new
-see_also:
-- containers/127-mule-photos-new.md
-mcp_endpoint: https://mcp.hubris.network/sse
-secrets_issuance_endpoint: https://secrets.hubris.network/issue