T2-024: Rate limiting per user -- prevent AI abuse

Track: 2 — UI Revamp + AI Analytics
Section: Backend API -- AI Analytics Engine (Gemini Pro + DeepSeek)
Status: [ ] Todo
Repo: backend-api
Branch: feature/T2-024-ai-rate-limiting

Done When

Max 20 analytics requests/day per user. Max 5 food photo analyses/day. Exceeded -> 429 with retry_after. Configurable per plan

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