BE-069: GET /activities/stats — activity summary stats

Track: 1 — MVP
Section: 1.17 GPS Activity Tracking (Running/Cycling)
Status: [ ] Todo
Repo: backend-api
Branch: feature/BE-069-activity-stats

Done When

Returns: total_distance (all time), total_activities, this_week_distance, this_month_distance, longest_run, fastest_pace, total_elevation. Filter by activity_type

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