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

app/proguard-rules.pro

@@ -0,0 +1,34 @@
+# Add project specific ProGuard rules here.
+
+# Retrofit
+-keepattributes Signature
+-keepattributes *Annotation*
+-keep class retrofit2.** { *; }
+-keepclasseswithmembers class * {
+    @retrofit2.http.* <methods>;
+}
+
+# Kotlinx Serialization
+-keepattributes *Annotation*, InnerClasses
+-dontnote kotlinx.serialization.AnnotationsKt
+-keepclassmembers class kotlinx.serialization.json.** {
+    *** Companion;
+}
+-keepclasseswithmembers class kotlinx.serialization.json.** {
+    kotlinx.serialization.KSerializer serializer(...);
+}
+-keep,includedescriptorclasses class com.geozoner.app.**$$serializer { *; }
+-keepclassmembers class com.geozoner.app.** {
+    *** Companion;
+}
+-keepclasseswithmembers class com.geozoner.app.** {
+    kotlinx.serialization.KSerializer serializer(...);
+}
+
+# OkHttp
+-dontwarn okhttp3.**
+-dontwarn okio.**
+
+# Room
+-keep class * extends androidx.room.RoomDatabase
+-keep @androidx.room.Entity class *