feat(android): add Simkl authentication, scrobbling, and sync support

[Himanth-reddy]

Summary of Changes

This PR adds native Android & Android TV support for Simkl tracking, scrobbling, authentication, and watch history synchronization.

1. Retrofit API & Models (SimklApi.kt)

• Added SimklApi interface with DTO models for PIN authentication, scrobble events, activities, watched history, and watchlists.
• Registered provideSimklApi in AppModule.kt.

2. Decoupled Architecture (com.arflix.tv.data.repository.simkl.*)

• SimklAuthManager: Manages PIN device code auth, token storage in DataStore (simkl_access_token), and session disconnects.
• SimklScrobbler: Handles real-time scrobbling (scrobbleStart, scrobblePause, scrobbleStop) and progress calculation with >=80% completion thresholding.
• SimklSyncService: Manages watched history fetching, delta updates via /sync/activities, and watchlist modifications.
• SimklRemoteProvider: Adapter implementing RemoteSyncProvider.

3. Provider Resolution & Settings UI

• Updated SyncProvider enum with SIMKL.
• Integrated SimklRemoteProvider into RemoteSyncManager.
• Added Simkl UI state and authentication actions in SettingsViewModel.kt.

4. Automated Tests

• Added unit test suite in SimklIntegrationTest.kt verifying PIN auth polling, scrobble payload building, and sync logic.

Testing & Verification

• Gradle build ./gradlew compileSideloadDebugKotlin succeeded.
• All unit tests in SimklIntegrationTest.kt passed.

[Himanth-reddy]

Superseded by #559 (from Himanth-reddy:simkl/android into main)