T2-081: Include GPS activity data in context builder

Track: 2 — UI Revamp + AI Analytics
Section: Backend API -- AI Analytics Engine (Gemini Pro + DeepSeek)
Status: [ ] Todo
Repo: backend-api
Branch: feature/T2-081-gps-context-builder

Done When

build_user_context() now includes: last 30 days of activities (type, distance, pace, HR, elevation). AI can reference: "Your average 5K pace improved from 6:30 to 5:45 over the last month"

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