BE-025: GET /health/metrics?metric_type=sleep returns structured sleep data

Track: 1 — MVP
Section: 1.8 Sleep Analysis API
Status: [ ] Todo
Repo: backend-api
Branch: feature/BE-025-structured-sleep-data

Done When

Response includes: sleep_score, total_duration, time_in_bed, sleep_efficiency, stages: { awake, light, deep, rem } as minutes. Matches raw data from device sync

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