T2-008: POST /food/photo -- upload food photo for analysis

Track: 2 — UI Revamp + AI Analytics
Section: Backend API -- Food Photo Analysis
Status: [ ] Todo
Repo: backend-api
Branch: feature/T2-008-upload-food-photo

Done When

Accepts image (JPEG/PNG, max 10MB). Saves to S3 food-photos/ prefix. Creates user_uploads row with upload_type=food_photo. Returns upload ID

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