T2-002: POST /uploads/health-data -- accept CSV/JSON health data

Track: 2 — UI Revamp + AI Analytics
Section: Backend API -- Data Upload & Storage
Status: [ ] Todo
Repo: backend-api
Branch: feature/T2-002-upload-health-data

Done When

User uploads CSV or JSON file with health data. File saved to S3. Row created in user_uploads. Supports: steps, HR, sleep, weight, blood pressure, glucose. Returns upload ID

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