Realtime Ai production release

This folder intentionally excludes:
- ai-engine/
- node_modules/
- server/.env
- server/data.json
- server/uploads/
- frontend source files

Deploy this compiled client/server app, then create server/.env on the production server.
Persist server/uploads outside disposable deploy directories if your host replaces releases.
Self-hosted AI is disabled unless ENABLE_SELF_HOSTED_AI=true is set.