rewire 2026-08-11: single-mount NFS architecture

- topology.svg, container-tree.svg, data-flow.svg: show /srv/nc-files
  bound directly into nextcloud container at /mnt/ncdata (no
  intermediate /mnt/nc-data/nextcloud-data layer).
- architecture.html: explain rewire, update storage table, remove
  pre-rewire 'why two layers' section.
- procedure.html: NEXTCLOUD_DATADIR=/srv/nc-files, no mastercontainer
  bind, add §2.5 Rewire 2026-08-11 with recovery procedure,
  update backup script to also tar local nextcloud app volume,
  fix 4.3 verification (302 -> /login, status.php, file visibility).
- operations.html: 4 backup files now (added aio-nextcloud-app.tar.gz),
  restore procedures updated, single-file restore uses new tar layout.
- troubleshooting.html: add 3 new sections — appdata-missing,
  nextcloud-not-spawning, collabora-discovery-warning.
- request-flow.svg: remove nextcloud/ subdir from NFS write path.
- index.html, README.md: update paths and metadata.

README.md

@@ -1,8 +1,11 @@
 # Nextcloud Office
 
-Session log + runbook for the 2026-08-10 deployment of `office.rmf44.xyz`
-as a Nextcloud All-in-One stack with Collabora + Whiteboard on
-`homework03`, replacing the retired OnlyOffice container on `hawker`.
+Session log + runbook for the 2026-08-10 deployment and 2026-08-11
+rewire of `office.rmf44.xyz` as a Nextcloud All-in-One stack with
+Collabora + Whiteboard on `homework03`, replacing the retired
+OnlyOffice container on `hawker`. The 2026-08-11 rewire collapsed the
+storage layer to a single NFS bind (post-mortem in
+`troubleshooting.html#appdata-missing`).
 
 ## Files
 
@@ -16,7 +19,6 @@ as a Nextcloud All-in-One stack with Collabora + Whiteboard on
 - `assets/diagrams/container-tree.svg` — 8 AIO containers + bind mounts
 - `assets/diagrams/data-flow.svg` — NFS vs ext4 split, database on host
 - `assets/diagrams/request-flow.svg` — swimlane sequence of a `git clone`-equivalent
-- `assets/diagrams/backup-pipeline.svg` — hector timer → homework03 → desslok NFS
 
 ## How to view