T2-019: POST /analytics/activity-insights -- activity pattern analysis

Track: 2 — UI Revamp + AI Analytics
Section: Backend API -- AI Analytics Engine (Gemini Pro + DeepSeek)
Status: [ ] Todo
Repo: backend-api
Branch: feature/T2-019-ai-activity-insights

Done When

Analyzes activity data. Returns: activity consistency score, peak performance days, recovery suggestions, goal progress assessment

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