BE-060: FCM send function — deliver push via Firebase

Track: 1 — MVP
Section: 1.16 Push Notifications
Status: [ ] Todo
Repo: backend-api
Branch: feature/BE-060-fcm-send

Done When

Internal push::send(user_id, title, body, data) function finds all active tokens for user, sends via FCM API. Returns count of successful deliveries

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