feat(kotlin-sdk): restore 13 deferred UI files — diagnostics, clients, Compose UI, passkeys, deep links
- Move 5 diagnostics files into src/main/.../diagnostics/ (DiagnosticsTypes, DiagnosticsClient, BreadcrumbTrail, DeviceStateCollector, NetworkInterceptor)
- Move 3 API clients (BLBroadcastClient, BLSurveyClient, BLFeedbackClient) — fix toMediaType, serializer pattern, coroutine imports
- Move 2 pure Kotlin files (DeepLinkRouter, BLPasskeyManager)
- Move 3 Compose UI files into src/main/.../ui/ (BLAuthUI, SurveyUI, BroadcastUI)
- Move 2 test files (DiagnosticsTypesTest, BLAuthClientSmartAuthTest) — fix JUnit5, Device JSON, serializer
- Add coil-compose dependency for AsyncImage
- Add appVersion/osVersion fields to BLPlatformConfig
- Fix OkHttp Headers iteration (name/value indexed access)
- Fix BroadcastUI string comparisons for status/style/priority
- Remove _deferred_ui/ directory — all files now compile in src/
- 57 tests total, 56 pass (1 pre-existing BLKillSwitchClientTest failure)
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