T2-021: POST /analytics/custom -- freeform analytics query

Track: 2 — UI Revamp + AI Analytics
Section: Backend API -- AI Analytics Engine (Gemini Pro + DeepSeek)
Status: [ ] Todo
Repo: backend-api
Branch: feature/T2-021-ai-custom-query

Done When

User asks a question about their health data. AI receives question + relevant health context. Returns natural language answer with data citations

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