Android Phase D: Project foundation, Room DB, Retrofit API, Hilt

- Android CLI Setup: initialized empty-activity app (AGP 9.0, Kotlin 2.3.20)
- Version catalog: Compose BOM 2026.03.01, Material 3, Hilt 2.60.1, Room 2.7.2,
  Retrofit 2.11.0, OkHttp 4.12.0, WorkManager 2.10.2, Kotlinx Serialization
- Room Database (v1): ListEntity, ItemEntity, OpLogEntity
- Room DAOs: ListDao, ItemDao, OpLogDao with LWW upsert queries
- Network layer: MitbringslApi Retrofit interface + DTOs + AuthInterceptor
- Dependency Injection: DatabaseModule, NetworkModule, RepositoryModule, HiltAndroidApp
- Build verification: assembleDebug & test green ✅

android/app/build.gradle.kts

@@ -0,0 +1,125 @@
+plugins {
+  alias(libs.plugins.android.application)
+  alias(libs.plugins.compose.compiler)
+  alias(libs.plugins.hilt)
+  alias(libs.plugins.kotlin.serialization)
+  alias(libs.plugins.ksp)
+  alias(libs.plugins.room)
+}
+
+android {
+  namespace = "com.example.mitbringsl"
+  compileSdk = 36
+
+  defaultConfig {
+    applicationId = "com.example.mitbringsl"
+    minSdk = 26
+    targetSdk = 36
+    versionCode = 1
+    versionName = "1.0"
+
+    testInstrumentationRunner = "androidx.test.runner.AndroidJUnitRunner"
+
+    // Backend base URL – override in release build or via local.properties
+    buildConfigField("String", "BASE_URL", "\"http://10.0.2.2:8080/\"")
+  }
+
+  buildTypes {
+    release {
+      isMinifyEnabled = true
+      proguardFiles(getDefaultProguardFile("proguard-android-optimize.txt"), "proguard-rules.pro")
+      // Override BASE_URL for production
+      buildConfigField("String", "BASE_URL", "\"https://mitbringsl.example.com/\"")
+    }
+  }
+
+  compileOptions {
+    sourceCompatibility = JavaVersion.VERSION_17
+    targetCompatibility = JavaVersion.VERSION_17
+  }
+
+  buildFeatures {
+    compose = true
+    buildConfig = true   // needed for BASE_URL injection
+    aidl = false
+    shaders = false
+  }
+
+  packaging {
+    resources {
+      excludes += "/META-INF/{AL2.0,LGPL2.1}"
+    }
+  }
+}
+
+// Room schema export directory
+room {
+  schemaDirectory("$projectDir/schemas")
+}
+
+kotlin {
+  jvmToolchain(17)
+}
+
+dependencies {
+  val composeBom = platform(libs.androidx.compose.bom)
+  implementation(composeBom)
+  androidTestImplementation(composeBom)
+
+  // Core Android
+  implementation(libs.androidx.core.ktx)
+  implementation(libs.androidx.lifecycle.runtime.ktx)
+  implementation(libs.androidx.activity.compose)
+
+  // Lifecycle / ViewModel
+  implementation(libs.androidx.lifecycle.runtime.compose)
+  implementation(libs.androidx.lifecycle.viewmodel.compose)
+
+  // Compose UI + Material3
+  implementation(libs.androidx.compose.ui)
+  implementation(libs.androidx.compose.ui.tooling.preview)
+  implementation(libs.androidx.compose.material3)
+  debugImplementation(libs.androidx.compose.ui.tooling)
+
+  // Navigation 3
+  implementation(libs.androidx.navigation3.ui)
+  implementation(libs.androidx.navigation3.runtime)
+  implementation(libs.androidx.lifecycle.viewmodel.navigation3)
+
+  // Hilt (DI)
+  implementation(libs.hilt.android)
+  ksp(libs.hilt.android.compiler)
+  implementation(libs.hilt.navigation.compose)
+
+  // Room (local DB – source of truth)
+  implementation(libs.room.runtime)
+  implementation(libs.room.ktx)
+  ksp(libs.room.compiler)
+
+  // Retrofit + OkHttp (network)
+  implementation(libs.retrofit)
+  implementation(libs.retrofit.serialization)
+  implementation(libs.okhttp)
+  implementation(libs.okhttp.logging)
+
+  // Kotlinx Serialization (JSON)
+  implementation(libs.kotlinx.serialization.json)
+
+  // Coroutines
+  implementation(libs.kotlinx.coroutines.android)
+
+  // WorkManager (background sync)
+  implementation(libs.workmanager.ktx)
+  implementation(libs.hilt.work)
+  ksp(libs.hilt.work.compiler)
+
+  // Tests
+  testImplementation(libs.junit)
+  testImplementation(libs.kotlinx.coroutines.test)
+  androidTestImplementation(libs.androidx.test.core)
+  androidTestImplementation(libs.androidx.test.ext.junit)
+  androidTestImplementation(libs.androidx.test.runner)
+  androidTestImplementation(libs.androidx.test.espresso.core)
+  androidTestImplementation(libs.androidx.compose.ui.test.junit4)
+  debugImplementation(libs.androidx.compose.ui.test.manifest)
+}