Initial commit: GeoZoner Android app scaffolding

- Full Android project with Gradle wrapper
- Hilt DI, Room DB, Retrofit networking
- Auth flow with JWT token management
- Bottom navigation with 4 tabs
- Material 3 theme (light/dark)
- Stub screens ready for implementation
- Ready for Mapbox integration

gradle.properties

@@ -0,0 +1,19 @@
+# Project-wide Gradle settings.
+org.gradle.jvmargs=-Xmx2048m -Dfile.encoding=UTF-8
+org.gradle.parallel=true
+org.gradle.configuration-cache=true
+
+# Use Android Studio's bundled JDK (JBR 21) to run Gradle
+org.gradle.java.home=C:\\Program Files\\Android\\Android Studio\\jbr
+
+# AndroidX
+android.useAndroidX=true
+
+# Kotlin
+kotlin.code.style=official
+
+# Non-transitive R classes
+android.nonTransitiveRClass=true
+
+# Mapbox token (set in local.properties or CI env)
+# MAPBOX_DOWNLOADS_TOKEN=sk.xxx