feat: implement Android data models in Kotlin

- Add FeedItem, Feed, FeedSubscription models with Moshi JSON support
- Add SearchResult, SearchFilters models with sealed classes for enums
- Add NotificationPreferences, ReadingPreferences models
- Add Room Entity annotations for database readiness
- Add TypeConverters for Date and List<String> serialization
- Add Parcelize for passing models between Activities/Fragments
- Write comprehensive unit tests for serialization/deserialization
- Write tests for copy(), equals/hashCode, and toString functionality

native-route/android/build.gradle.kts

@@ -0,0 +1,51 @@
+plugins {
+    id("com.android.library")
+    id("org.jetbrains.kotlin.android")
+    id("kotlin-parcelize")
+    id("kotlin-kapt")
+}
+
+android {
+    namespace = "com.rssuper"
+    compileSdk = 34
+
+    defaultConfig {
+        minSdk = 24
+        testInstrumentationRunner = "androidx.test.runner.AndroidJUnitRunner"
+    }
+
+    buildTypes {
+        release {
+            isMinifyEnabled = false
+        }
+    }
+
+    compileOptions {
+        sourceCompatibility = JavaVersion.VERSION_17
+        targetCompatibility = JavaVersion.VERSION_17
+    }
+
+    kotlinOptions {
+        jvmTarget = "17"
+    }
+}
+
+dependencies {
+    // AndroidX
+    implementation("androidx.core:core-ktx:1.12.0")
+    implementation("androidx.room:room-runtime:2.6.1")
+    implementation("androidx.room:room-ktx:2.6.1")
+    kapt("androidx.room:room-compiler:2.6.1")
+
+    // Moshi for JSON serialization
+    implementation("com.squareup.moshi:moshi-kotlin:1.15.1")
+    kapt("com.squareup.moshi:moshi-kotlin-codegen:1.15.1")
+    implementation("com.squareup.moshi:moshi-kotlin-reflect:1.15.1")
+
+    // Testing
+    testImplementation("junit:junit:4.13.2")
+    testImplementation("com.squareup.moshi:moshi-kotlin:1.15.1")
+    testImplementation("com.squareup.moshi:moshi-kotlin-reflect:1.15.1")
+    testImplementation("org.mockito:mockito-core:5.7.0")
+    testImplementation("org.mockito:mockito-inline:5.2.0")
+}