Scaffold silvestre-flutter package with flutter_rust_bridge v2

[enzoftware]

Description

Create the Flutter package that wraps silvestre-core via flutter_rust_bridge v2, providing a native Dart API for image processing.

Context

The Flutter package uses flutter_rust_bridge v2 for codegen, generating Dart bindings from a Rust API layer. The Rust side lives in silvestre-flutter/rust/ and depends on silvestre-core.

Tasks

• Create silvestre-flutter/ package scaffold with pubspec.yaml
• Set up silvestre-flutter/rust/Cargo.toml depending on silvestre-core
• Create silvestre-flutter/rust/src/api.rs — public API surface for bridge codegen
• Configure flutter_rust_bridge v2 codegen (flutter_rust_bridge.yaml or equivalent)
• Run codegen and verify Dart bindings are generated
• Create silvestre-flutter/lib/silvestre.dart with high-level Dart API:

  final image = await Silvestre.loadImage(path);
  final result = await image.applyFilter(SilvestreFilter.canny());
  await result.save('output.png');

• Platform directory stubs for android/, ios/, macos/, linux/, windows/

Acceptance Criteria

• flutter_rust_bridge_codegen generate runs without errors
• Generated Dart bindings compile
• Dart API is idiomatic (async, named parameters, typed filter enums)
• Package structure follows Flutter plugin conventions
• flutter analyze passes with no errors