BE-061: Health alert notification — abnormal HR/SpO2

Track: 1 — MVP
Section: 1.16 Push Notifications
Status: [ ] Todo
Repo: backend-api
Branch: feature/BE-061-health-alert-push

Done When

When sync receives HR > 180 or HR < 40 or SpO2 < 90 (not backfill), push sent: "Abnormal heart rate detected: 185 bpm". Logged in notifications table

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