T2-080: POST /analytics/cycling-analysis -- AI cycling performance analysis

Track: 2 — UI Revamp + AI Analytics
Section: Backend API -- AI Analytics Engine (Gemini Pro + DeepSeek)
Status: [ ] Todo
Repo: backend-api
Branch: feature/T2-080-ai-cycling-analysis

Done When

Analyzes GPS activities (type=cycle). Context: avg speed trends, distance progression, elevation performance, HR zones. Returns: FTP estimate, endurance trend, route difficulty ratings, training suggestions

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