Lighten Strapi CMS: drop unused cloud plugin, disable telemetry/promo UI

Remove @strapi/plugin-cloud (deploy is self-hosted via Docker/Ansible,
never Strapi Cloud), disable the admin NPS/Enterprise-promotion flags
(single-admin panel, no upsell needed), disable Strapi's anonymous
telemetry, and prune dev dependencies from the production Docker image
layer.

docker-compose.yml

@@ -36,6 +36,7 @@ services:
       TRANSFER_TOKEN_SALT: ${TRANSFER_TOKEN_SALT}
       JWT_SECRET: ${JWT_SECRET}
       ENCRYPTION_KEY: ${ENCRYPTION_KEY}
+      STRAPI_TELEMETRY_DISABLED: "true"
     volumes:
       - cms-uploads:/app/public/uploads