BE-063: Sync reminder notification — no sync in 24h

Track: 1 — MVP
Section: 1.16 Push Notifications
Status: [ ] Todo
Repo: backend-api
Branch: feature/BE-063-sync-reminder-push

Done When

Background job checks users with devices but no sync in 24h. Sends push: "Your [Ring/Band] hasn't synced in a while. Open the app to sync." Once per day max

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