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/compose.dev.yaml

@@ -1,8 +1,7 @@
-# Development override: publishes SearXNG on the dev machine's loopback so
-# it can be queried directly, e.g.
-#
-#   docker compose -f deploy/compose.yaml -f deploy/compose.dev.yaml up -d searxng
-#   curl 'http://127.0.0.1:8888/search?q=chicken+tikka+masala+recipe&format=json'
+# Development override layered on deploy/compose.yaml: publishes SearXNG
+# on the dev machine's loopback (127.0.0.1:8888) so it can be queried
+# directly. Using it: CTXD project mealquest, RUNBOOKS.MD "Local
+# development".
 #
 # Loopback only, never a LAN address. Never used in production: the
 # systemd unit starts deploy/compose.yaml alone.