feat: localisation with en, de, fr and it

AGENTS.md

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+# Conduit - Flutter Mobile App for Open-WebUI
+
+## Build & Test Commands
+```bash
+flutter pub get                                    # Install dependencies
+flutter pub run build_runner build --delete-conflicting-outputs  # Generate code
+flutter analyze                                     # Run static analysis
+flutter run -d ios/android                        # Run debug build
+flutter build apk --release                       # Build Android release
+flutter build ipa --release                       # Build iOS release
+```
+
+## Code Style Guidelines
+- **State Management**: Use Riverpod providers in `providers/` folders
+- **Architecture**: Follow clean architecture - `core/`, `features/`, `shared/`
+- **Imports**: Group by package/relative, use absolute paths for project files
+- **Models**: Use Freezed for data classes with `.freezed.dart` and `.g.dart` generated files
+- **Error Handling**: Use ApiErrorHandler and error interceptors, avoid print statements
+- **Naming**: snake_case files, PascalCase classes, camelCase methods/variables
+- **Async**: Prefer async/await over raw Futures, handle errors with try-catch
+- **Widgets**: Separate presentation (widgets/) from business logic (services/)
+- **UI Design**: Use AppTheme colors/styles and ConduitThemeExtension for consistent design
+- **Dependencies**: Check pubspec.yaml before adding packages - prefer existing solutions