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.

cms/Dockerfile

@@ -6,6 +6,7 @@ COPY package*.json ./
 RUN npm ci
 COPY . .
 RUN npm run build
+RUN npm prune --omit=dev
 
 FROM node:22-alpine AS runtime
 WORKDIR /app