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/config/admin.ts

@@ -16,8 +16,8 @@ const config = ({ env }: Core.Config.Shared.ConfigParams): Core.Config.Admin =>
     encryptionKey: env('ENCRYPTION_KEY')!,
   },
   flags: {
-    nps: env.bool('FLAG_NPS', true),
-    promoteEE: env.bool('FLAG_PROMOTE_EE', true),
+    nps: env.bool('FLAG_NPS', false),
+    promoteEE: env.bool('FLAG_PROMOTE_EE', false),
     docLinks: env.bool('FLAG_DOC_LINKS', true),
   },
 });