init: android project scaffold (Phase 28.1)

- Kotlin DSL build with version catalog (AGP 8.7, Kotlin 2.1, Compose BOM 2025.01)
- app module: Compose + Material 3, dark theme, network security config
- DualNetworkTestScreen — Phase 28.1 gate screen (buttons wired in 28.1.2)
- YarisApp, MainActivity, YarisOBDTheme
- ProGuard rules for Retrofit/OkHttp/Kotlinx Serialization/Coil/MapLibre/Room
- cleartext allowed for 10.42.0.1 + yaris.local
- gradle wrapper properties (needs Android Studio to generate wrapper jar)

android/gradle.properties

@@ -0,0 +1,20 @@
+# Project-wide Gradle settings.
+org.gradle.jvmargs=-Xmx2048m -Dfile.encoding=UTF-8
+org.gradle.parallel=true
+org.gradle.caching=true
+
+# AndroidX package structure
+android.useAndroidX=true
+
+# Kotlin code style
+kotlin.code.style=official
+
+# Compose compiler (managed by Kotlin plugin in AGP 8.x+)
+# No longer need composeVersion here — managed automatically
+
+# Disable build features we don't use
+android.defaults.buildfeatures.buildconfig=true
+android.defaults.buildfeatures.aidl=false
+android.defaults.buildfeatures.renderscript=false
+android.defaults.buildfeatures.resvalues=false
+android.defaults.buildfeatures.shaders=false