T2-012: Save food analysis to nutrition log

Track: 2 — UI Revamp + AI Analytics
Section: Backend API -- Food Photo Analysis
Status: [ ] Todo
Repo: backend-api
Branch: feature/T2-012-save-food-log

Done When

After analysis, create food_log entry: user_id, meal_type (breakfast/lunch/dinner/snack), foods array, total_calories, total_macros, photo_url, analyzed_at. User can confirm or edit before saving

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