BE-026: Add 7-day sleep trend endpoint — GET /health/sleep/trend?days=7

Track: 1 — MVP
Section: 1.8 Sleep Analysis API
Status: [ ] Todo
Repo: backend-api
Branch: feature/BE-026-sleep-trend-endpoint

Done When

Returns array of 7 objects with date, score, duration, deep_minutes. Missing nights return null entry (not omitted)

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