Phase 1: minimal Kotlin Android app shows Hub /health

Scaffold the Android Gradle project under android/ mirroring the proven
internet_use_control toolchain: Gradle wrapper 8.11.1, AGP 8.7.3, Kotlin
2.0.21, compileSdk/targetSdk 35, Java/Kotlin 17, minSdk 29 (AGENTS.md §9).

One Activity calls GET http://192.168.20.13:8788/health off the main thread
and renders ok, service, version and every checks value plus the raw body.
INTERNET permission and usesCleartextTraffic are declared for the LAN Hub.
A failed or non-2xx call renders an explicit error line and never reports
success (AGENTS.md §10 rule 4).

applicationId au.audasmedia.hub.phone, versionName 0.1.0-phase1.

Co-Authored-By: Paperclip <noreply@paperclip.ing>

android/.gitignore

@@ -0,0 +1,16 @@
+# Android / Gradle build output
+build/
+.gradle/
+local.properties
+*.apk
+*.aab
+*.keystore
+*.jks
+.cxx/
+captures/
+.kotlin/
+
+# IDE
+.idea/
+*.iml
+.DS_Store