Add Windows batch script for building Android APKs:
- build-apk.bat debug - Build debug APK only
- build-apk.bat release - Build release APK only
- build-apk.bat - Build both debug and release APKs
- build-apk.bat clean - Clean build files
- build-apk.bat help - Show usage help
Output locations:
- Debug: app/build/outputs/apk/debug/app-debug.apk
- Release: app/build/outputs/apk/release/app-release.apk
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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
