T2-018: POST /analytics/sleep-analysis -- deep sleep analysis

Track: 2 — UI Revamp + AI Analytics
Section: Backend API -- AI Analytics Engine (Gemini Pro + DeepSeek)
Status: [ ] Todo
Repo: backend-api
Branch: feature/T2-018-ai-sleep-analysis

Done When

Analyzes 14+ days of sleep data. Returns: sleep quality trend, optimal bedtime suggestion, factors affecting sleep, comparison to recommended ranges

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