How to build: order reminder worker

implemented

In-process setTimeout in plugins/nellalink-init/reminder.js (default about 5 minutes after place-order). Not a separate worker service. Cancels when the order is updated.

No frontend call. Activate by deploying Middleware with nellalink-init ENVs. If the Node process restarts, in-memory timers are lost — known limitation.

Triggered from place order; uses notify owner channels again.