BE-070: Live activity endpoint — POST /activities/live — save GPS point during activity

Track: 1 — MVP
Section: 1.17 GPS Activity Tracking (Running/Cycling)
Status: [ ] Todo
Repo: backend-api
Branch: feature/BE-070-live-activity-points

Done When

Accepts single GPS point {lat, lng, alt, timestamp, heart_rate}. Appends to in-progress activity. For real-time tracking. Batched: accepts array of up to 50 points

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