T2-031: Add AnalyticsService -- all AI analytics endpoints

Track: 2 — UI Revamp + AI Analytics
Section: Athion SDK
Status: [ ] Todo
Repo: athion-sdk
Branch: feature/T2-031-analytics-service

Done When

Methods: getHealthReport(), getSleepAnalysis(), getActivityInsights(), getNutritionReview(), askCustom(question). All return typed models

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