Point rxprod-compose at prebuilt images and its own control-api.yaml/capi-db

docker-compose.yml now runs from prebuilt images (civ-capi/civ-adash/
civ-prober) instead of building from source, mounts this host's own
rxprod-compose/control-api.yaml and capi-db/ (both local, gitignored
except control-api.yaml itself which is now committed), and moves
control-api off port 8080 onto 8081.

rxprod-compose/sources/ carries local copies of the example configs
(admin-dashboard/control-api/prober/validator-agent) plus .env.example,
moved here from rxprod-compose/.env.example, for reference alongside
this specific deployment's docker-compose.yml.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

rxprod-compose/sources/.env.example

@@ -0,0 +1,21 @@
+# Скопировать в .env в этой же папке и заполнить реальными значениями —
+# docker compose сам подхватывает .env из директории compose-файла.
+#
+#   cp .env.example .env
+#   docker compose up -d --build
+
+# OpenStack (VK Cloud) креденшлы — control-api.yaml должен быть в
+# openstack.mode: real.
+OS_AUTH_URL=
+OS_PROJECT_ID=
+OS_REGION_NAME=
+OS_INTERFACE=
+OS_TOKEN=
+# Парольная авторизация вместо токена — вместо OS_TOKEN заполнить эти три:
+# OS_USERNAME=
+# OS_USER_DOMAIN_NAME=
+# OS_PASSWORD=
+
+# prober — обязателен, должен совпадать с site_id, уже настроенным в
+# реальном control-api.yaml (validators/sites/targets/ip_addresses).
+PROBER_SITE_ID=