feat: add Cube.js dev setup and analytics client

- Add Cube container to docker-compose.dev.yml (pinned v1.3.21)
- Add Cube server config (cube/cube.js) and FeedbackRecords schema
- Add @cubejs-client/core dependency and singleton client in EE module
- Add CUBEJS_API_URL and CUBEJS_API_TOKEN to .env.example

Co-authored-by: Cursor <cursoragent@cursor.com>

apps/web/package.json

@@ -23,6 +23,7 @@
     "@aws-sdk/s3-presigned-post": "3.971.0",
     "@aws-sdk/s3-request-presigner": "3.971.0",
     "@boxyhq/saml-jackson": "1.52.2",
+    "@cubejs-client/core": "1.6.6",
     "@dnd-kit/core": "6.3.1",
     "@dnd-kit/modifiers": "9.0.0",
     "@dnd-kit/sortable": "10.0.0",