Summary

• Upgrade Android Gradle Plugin from 8.13.0 to 9.0.0
• Upgrade Gradle wrapper from 8.14 to 9.3.1
• Upgrade KSP from 2.2.10-2.0.2 to 2.3.2
• Remove deprecated android.defaults.buildfeatures.buildconfig global property, enable per-module
• Migrate APK renaming from deprecated buildOutputs.all to androidComponents.onVariants API
• Add AGP 9.0 compatibility properties to gradle.properties
• Fix resource leak in signing config (unclosed FileInputStream)
• Add warnings for missing signing configuration

Test plan

• ./gradlew assembleFossDebug builds successfully
• ./gradlew assembleGplayDebug builds successfully
• Release APK renaming still works correctly
• Signing config works with both env vars and properties file