BE-028: Daily activity rollup — GET /health/activity?date=...

Track: 1 — MVP
Section: 1.9 Activity Metrics API
Status: [ ] Todo
Repo: backend-api
Branch: feature/BE-028-daily-activity-rollup

Done When

Returns { steps, distance_km, calories, active_minutes, floors } summed for the day. Verified against raw records

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