T2-026: GET /profile/v2 -- enhanced profile with analytics summary

Track: 2 — UI Revamp + AI Analytics
Section: Backend API -- UI Data Endpoints
Status: [ ] Todo
Repo: backend-api
Branch: feature/T2-026-profile-v2

Done When

Returns profile + lifetime stats: total workouts, avg sleep score, health trend (improving/declining/stable), AI-generated bio-summary

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