feat(deploy): instances keep their dictionaries current, weekly, by themselves

EDRDG's licence asks of a server showing its dictionaries that it update
them at least monthly. The instance now does it alone: a `dictionaries`
service in compose, built from the curator (halkyon_learn_curator/
Dockerfile, its own unprivileged user 10001, 1 GB at most), runs `curate
update --every 7`, downloading EDRDG's files of the day once its files are
a week old and replacing them in a volume the server mounts read-only.
The curator never enters the server's image or process (decided
2026-10-09: a container of its own, weekly). The server rereads the
folder daily at 04:07 (DictionaryReloadFutureCall), loading what changed,
and loads now run one at a time. redeploy.sh builds both images.

An operator who'd rather supply the files removes the service and mounts
deploy/dictionaries/ into the server, as compose.yaml says.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01MMm7usAo6q9ZZRoPkWjoxi
Signed-off-by: Tizian 「ティツィアーン」 <raisondetredev@pm.me>

.dockerignore

@@ -1,5 +1,5 @@
 # The Docker build context is the repository root. Nothing secret, local or bulky
-# goes into it: the server's Dockerfile copies the whole halkyon_learn_server folder.
+# goes into it: the server's and the curator's Dockerfiles copy their whole package folders.
 
 # Secrets and local state
 halkyon_learn_server/config/passwords.yaml