BE-072: POST /activities/{id}/finish — complete live activity

Track: 1 — MVP
Section: 1.17 GPS Activity Tracking (Running/Cycling)
Status: [ ] Todo
Repo: backend-api
Branch: feature/BE-072-finish-live-activity

Done When

Sets status=completed, ended_at=now. Calculates: total distance from route points, avg pace, elevation gain/loss, calories (from HR + distance + weight). Returns completed activity summary

Notes

No notes yet.