feat: add expo-build-properties plugin to set minSdkVersion 26

Using expo-build-properties plugin for proper minSdk configuration.
Required for react-native-vad which needs Android O (API 26) or higher.

Generated with [Claude Code](https://claude.ai/code)
via [Happy](https://happy.engineering)

Co-Authored-By: Claude <noreply@anthropic.com>
Co-Authored-By: Happy <yesreply@happy.engineering>

android/build.gradle

@@ -0,0 +1,24 @@
+// Top-level build file where you can add configuration options common to all sub-projects/modules.
+
+buildscript {
+  repositories {
+    google()
+    mavenCentral()
+  }
+  dependencies {
+    classpath('com.android.tools.build:gradle')
+    classpath('com.facebook.react:react-native-gradle-plugin')
+    classpath('org.jetbrains.kotlin:kotlin-gradle-plugin')
+  }
+}
+
+allprojects {
+  repositories {
+    google()
+    mavenCentral()
+    maven { url 'https://www.jitpack.io' }
+  }
+}
+
+apply plugin: "expo-root-project"
+apply plugin: "com.facebook.react.rootproject"