feat: add in-stack Euro-Office integration (15.1.0)

Optional compose.eurooffice.yml overlay that runs the Euro-Office document
server (ghcr.io/euro-office/documentserver) inside the stack, with its own
Postgres and RabbitMQ services. The document server schema is seeded into that
Postgres on first init (eurooffice-createdb.sql). Postgres is internal-only with
trust auth, so the only managed secret is the JWT. A custom entrypoint injects
the JWT from the Swarm secret, then execs the image's entrypoint.

Additive: no effect on existing installs unless enabled. Adds install_eurooffice()
plus EUROOFFICE_DOMAIN / SECRET_EUROOFFICE_JWT_VERSION config.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

abra.sh

@@ -12,7 +12,7 @@ export CRONTAB_VERSION=v1
 export PG_BACKUP_VERSION=v2
 
 run_occ() {
-    su -p www-data -s /bin/sh -c "/var/www/html/occ $*"
+    su -p www-data -s /bin/sh -c "/var/www/html/occ $@"
 }
 
 install_apps() {