v1.0.0 of flutter_gemini_nano

Flutter plugin for on-device text and multimodal generation using Gemini Nano via ML Kit GenAI on Android. Changelog excerpt: ### Added - Initial release of flutter_gemini_nano - Gemini Nano on-device text generation support - Multimodal support (text + image) - Configurable generation parameters: - temperature - topK - seed - candidateCount - maxOutputTokens - Automatic model download handling - Graceful handling of unsupported devices - Public Dart API with typed response (GeminiNanoResponse) - Android implementation using ML Kit GenAI - Example Flutter application - Unit tests and integration tests [...]