feat(swift-sdk): add ByteLystPlatformSDK — shared Swift package for all iOS/watchOS/macOS apps
Extracts duplicated platform integration code from ChronoMind + LysnrAI into a
single Swift Package. Eliminates ~1,100+ lines of copied code per product app.
Components:
- BLPlatformConfig — product-specific configuration (productId, baseURL, bundleId)
- BLPlatformClient — generic HTTP client with auth injection, x-request-id, timeout
- BLKeychain — Keychain CRUD for secure token storage
- BLTelemetryClient — telemetry queue + batch flush (matches @bytelyst/telemetry-client)
- BLAuthClient — full auth operations (matches @bytelyst/auth-client)
- BLFeatureFlagClient — feature flag polling from platform-service /flags/poll
- BLSyncEngine — generic offline-first sync with delta pull + batch push
Platforms: iOS 17+, watchOS 10+, macOS 14+
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