Make Android Build Universal & Set ROMeo as Official App Icon

[ClausValcaTD]

Fixes two Android build issues:

1. Prevent emulator crashes (UnsatisfiedLinkError) by adding x86_64 to abiFilters alongside arm64-v8a in gui/android/app/build.gradle.kts and updating .github/workflows/Android.yml to support both native ABIs and build universal release APKs (flutter build apk --release).
2. Configured flutter_launcher_icons in gui/pubspec.yaml with ROMeo asset (assets/icons/icon.png) and adaptive background #090910, generating all standard and adaptive mipmap icon assets.

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PR created automatically by Jules for task 15841228783446953405 started by @ClausValcaTD

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