CA-019: Replace api_client.dart Dio calls with athion_sdk calls

Track: 1 — MVP
Section: 1.50 SDK Migration
Status: [ ] Todo
Repo: coach-app
Branch: feature/CA-019-sdk-migration

Done When

All HTTP calls in lib/services/api/ use AthionSDK instead of raw Dio. api_client.dart deleted. App compiles

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