feat(domain): add repository interfaces

app/src/main/java/com/radiola/domain/repository/FavoritesRepository.kt

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+package com.radiola.domain.repository
+
+import com.radiola.domain.model.Station
+import kotlinx.coroutines.flow.Flow
+
+interface FavoritesRepository {
+    fun getFavorites(): Flow<List<Station>>
+    suspend fun addFavorite(station: Station)
+    suspend fun removeFavorite(stationId: Int)
+    fun isFavorite(stationId: Int): Flow<Boolean>
+    suspend fun reorderFavorites(orderedIds: List<Int>)
+}

app/src/main/java/com/radiola/domain/repository/NowPlayingRepository.kt

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+package com.radiola.domain.repository
+
+import com.radiola.domain.model.Track
+import kotlinx.coroutines.flow.Flow
+
+interface NowPlayingRepository {
+    fun getNowPlaying(stationPrefix: String): Flow<Track?>
+    fun getAllNowPlaying(): Flow<Map<String, Track>>
+    suspend fun refreshNowPlaying(): Result<Unit>
+}

app/src/main/java/com/radiola/domain/repository/SettingsRepository.kt

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+package com.radiola.domain.repository
+
+import com.radiola.domain.model.DeeplinkService
+import kotlinx.coroutines.flow.Flow
+
+interface SettingsRepository {
+    fun getLastStationId(): Flow<Int?>
+    suspend fun setLastStationId(id: Int)
+    fun getSleepTimerMinutes(): Flow<Int>
+    suspend fun setSleepTimerMinutes(minutes: Int)
+    fun getEnabledDeeplinkServices(): Flow<Set<String>>
+    suspend fun setEnabledDeeplinkServices(serviceIds: Set<String>)
+    fun getEqualizerPreset(): Flow<String>
+    suspend fun setEqualizerPreset(preset: String)
+    fun isRecordingEnabled(): Flow<Boolean>
+    suspend fun setRecordingEnabled(enabled: Boolean)
+}

app/src/main/java/com/radiola/domain/repository/StationRepository.kt

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+package com.radiola.domain.repository
+
+import com.radiola.domain.model.Station
+import kotlinx.coroutines.flow.Flow
+
+interface StationRepository {
+    fun getStations(): Flow<List<Station>>
+    suspend fun refreshStations(): Result<Unit>
+    fun getStationById(id: Int): Flow<Station?>
+}

app/src/main/java/com/radiola/domain/repository/TrackHistoryRepository.kt

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+package com.radiola.domain.repository
+
+import com.radiola.domain.model.Track
+import kotlinx.coroutines.flow.Flow
+
+interface TrackHistoryRepository {
+    fun getHistory(): Flow<List<Track>>
+    suspend fun addTrack(track: Track)
+    suspend fun removeTrack(track: Track)
+    suspend fun searchHistory(query: String): List<Track>
+}