Replace the remaining deploy procedures with CTXD runbook pointers

The repository still carried operating steps from the deleted runbook:
secret creation and permission commands in deploy/.env.example, build,
restart and restore steps in deploy/compose.yaml, a direct
"docker compose up -d" in mealquest-firewall.service, a manual run in
mealquest-media-backup.service and a dev start command in
compose.dev.yaml. Replace each with a pointer to the named section of
CTXD project mealquest, RUNBOOKS.MD, keeping every variable, path,
owner, mode, port and mount description.

Maestro task e81ed994-a510-48e6-9cf6-e76d5d81f56c.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

deploy/systemd/mealquest-firewall.service

@@ -5,8 +5,9 @@
 # are one-way: a failure here fails this unit visibly and never fails
 # docker.service.
 #
-# Start MealQuest only after this unit has succeeded:
-#   systemctl start mealquest-firewall && docker compose up -d
+# mealquest.service requires this unit and starts the stack only after it
+# has succeeded. Installing and operating both: CTXD project mealquest,
+# RUNBOOKS.MD "Host firewall" and "Stack unit".
 [Unit]
 Description=Restrict MealQuest port 8090 to Traefik (DOCKER-USER)
 After=docker.service

deploy/systemd/mealquest-media-backup.service

@@ -1,8 +1,7 @@
 # Runs the nightly MealQuest media backup (/usr/local/sbin/mealquest-media-backup).
-# Triggered by mealquest-media-backup.timer; run by hand with
-#   systemctl start mealquest-media-backup
-# and read the result with
-#   journalctl -u mealquest-media-backup
+# Triggered by mealquest-media-backup.timer; output goes to the journal.
+# Installing it and running it by hand: CTXD project mealquest,
+# RUNBOOKS.MD "Media — nightly rsync".
 #
 # The script runs as the app's user (10001, host user "mealquest") with no
 # capabilities. systemd, as root, only bind-mounts the data volume's root

deploy/systemd/mealquest-media-backup.sh

@@ -16,8 +16,8 @@
 # directory are copied as links (-a), never followed.
 #
 # The media directory is created at deploy time (CTXD project mealquest,
-# RUNBOOKS.MD). If it is missing the job fails; it is never treated as
-# "nothing to back up".
+# RUNBOOKS.MD "Media — nightly rsync"). If it is missing the job fails; it
+# is never treated as "nothing to back up".
 #
 # rsync mirrors into .../mealquest-backups/media/ only: the target ends in
 # a slash, so --delete removes files from that directory and nothing