feat: enhance Android system media controls

[Quick104]

Summary

• publish wide catalog artwork to Android local-playback media sessions through a Coil-backed Media3 bitmap loader
• expose active Silo Remote Control sessions in Android system media controls, including transport, seek, next, metadata, and artwork
• keep the Remote Control service active while playback is engaged and guide users to disable battery optimization
• use cached or fetched item detail as a backward-compatible artwork fallback while the watch response lacks image fields

Validation

• full Gradle test suite passed
• phone debug APK assembled successfully
• TV debug APK assembled successfully
• physical Android playback harness passed with advancing playback
• live Android notification reported a 144x81 bitmap large icon and visibly rendered the backdrop

Follow-up

• Playback WatchDetail omits artwork required by system media controls silo-server#803 tracks adding artwork directly to the playback-oriented watch response so current clients can avoid the secondary catalog lookup while retaining compatibility with older servers.

[coderabbitai]

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📥 Commits

Reviewing files that changed from the base of the PR and between 4aec538 and 742f62f.

📒 Files selected for processing (17)

• android-shared/src/androidMain/kotlin/org/siloserver/silo/common/player/SiloMediaSessionBitmapLoader.kt
• android-shared/src/androidMain/kotlin/org/siloserver/silo/common/player/SiloPlaybackService.kt
• androidApp/src/androidMain/AndroidManifest.xml
• androidApp/src/androidMain/kotlin/org/siloserver/silo/android/SiloApplication.kt
• androidApp/src/androidMain/kotlin/org/siloserver/silo/android/cast/RemoteControlBatteryOptimization.kt
• androidApp/src/androidMain/kotlin/org/siloserver/silo/android/cast/SiloCastArtworkResolver.kt
• androidApp/src/androidMain/kotlin/org/siloserver/silo/android/cast/SiloCastController.kt
• androidApp/src/androidMain/kotlin/org/siloserver/silo/android/cast/SiloCastMediaSessionService.kt
• androidApp/src/androidMain/kotlin/org/siloserver/silo/android/cast/SiloCastMediaSessionStarter.kt
• androidApp/src/androidMain/kotlin/org/siloserver/silo/android/ui/screens/cast/SiloCastArtwork.kt
• androidApp/src/androidMain/kotlin/org/siloserver/silo/android/ui/screens/cast/SiloCastRemoteScreen.kt
• androidApp/src/androidMain/kotlin/org/siloserver/silo/android/ui/screens/player/MobileVideoPlaybackStarter.kt
• androidApp/src/androidMain/kotlin/org/siloserver/silo/android/ui/screens/player/PlayerViewModel.kt
• androidApp/src/androidMain/res/values/strings.xml
• androidApp/src/androidUnitTest/kotlin/org/siloserver/silo/android/cast/SiloCastMediaSessionStarterTest.kt
• androidTvApp/src/androidMain/kotlin/org/siloserver/silo/tv/ui/screens/player/TvVideoPlaybackStarter.kt
• shared/src/commonMain/kotlin/org/siloserver/silo/model/catalog/CatalogModels.kt

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