BE-018: Add sleep duration to summary — sum sleep stages

Track: 1 — MVP
Section: 1.6 Health Summary API
Status: [ ] Todo
Repo: backend-api
Branch: feature/BE-018-sleep-duration-summary

Done When

Summary includes sleep_duration_minutes, sleep_score, sleep_deep_minutes, sleep_rem_minutes. Values match raw health_metrics sleep records for that night

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