Offline functionality with flutter_gemma

[MrCsabaToth]

See https://share.google/aimode/06sHWY1GnLZLEKhY9
This would mean:

• Gemma 4n or 3n on device
• It contains Qdrant Edge so we'd migrate there from ObjectBox

https://pub.dev/packages/flutter_gemma/

[MrCsabaToth]

Also check out LlamaDart https://pub.dev/packages/llamadart