Allow LAN admin access and add a campaign mint form (#11).

Serve /admin/ on 10.0.0.128 so it can be used from another machine on the
network, and mint tracked short URLs from domain/campaign/source/metric.

README.md

@@ -19,8 +19,9 @@ This service is standalone. Do not fold it into `monica_site`.
 named Bearer token. No token / wrong token → **401**. No tokens configured → **503**.
 `GET /<code>` never requires a token.
 
-`/admin/` is 404 on the public host (localhost only). `GET /debug/` is a mint form
-when `DEBUG=true` and never on the public short host.
+`/admin/` is 404 on the public host. Local compose serves it on `localhost` and
+`10.0.0.128` (`http://10.0.0.128:8005/admin/` from another machine on the LAN).
+`GET /debug/` is a mint form when `DEBUG=true` and never on the public short host.
 
 ## Local run
 
@@ -40,6 +41,7 @@ uv run python manage.py runserver
 # optional local admin:
 # uv run python manage.py createsuperuser
 # then http://127.0.0.1:8005/admin/  (compose) or :8000 (runserver)
+# LAN: http://10.0.0.128:8005/admin/  (compose publishes 0.0.0.0:8005)
 ```
 
 Tests (SQLite, no network):