BE-031: Pattern detection — correlate sleep with next-day HRV

Track: 1 — MVP
Section: 1.10 Health Insights API
Status: [ ] Todo
Repo: backend-api
Branch: feature/BE-031-pattern-detection

Done When

GET /health/insights with 14+ days data returns patterns like { type: "correlation", metrics: ["sleep_duration", "hrv"], description: "...", confidence: 0.82 }

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