BE-052: POST /coach/managed-clients/{id}/metrics — log health data for client

Track: 1 — MVP
Section: 1.14 Coach Managed Clients
Status: [ ] Todo
Repo: backend-api
Branch: feature/BE-052-managed-client-metrics

Done When

Coach logs weight, body fat, measurements for managed client. Stored in health_metrics with source=coach_entry. Client's health summary includes this data

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