GOR-003: Godzilla BLE service in app-user — scan, connect, read metrics

Track: 1 — MVP
Section: 1.61 Godzilla Device Integration
Status: [ ] Todo
Repo: app-user
Branch: feature/GOR-003-ble-service

Done When

New godzilla_ble_service.dart handles: scan for Godzilla device, connect, subscribe to health characteristic notifications. Metrics parsed into CreateHealthMetricPayload

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