feat(arc): 添加虹软人脸识别插件基础功能

- 集成虹软 ArcSoft Face SDK，提供人脸检测、识别、活体检测功能
- 实现 Android 平台原生插件，包含 ArcPlugin 和 FaceEngineManager
- 添加完整的人脸错误码枚举（586个错误码），覆盖 SDK 所有错误情况
- 创建人脸信息数据模型 FaceInfo，封装检测结果和特征数据
- 配置 Android 权限和依赖，包括相机、存储、网络等必要权限
- 添加方法通道实现，连接 Flutter 层与原生层通信
- 配置项目基础文件，包含 .gitignore、分析选项和元数据配置
- 实现单元测试框架，包含 Dart 和 Java 层的基本测试用例
- 添加示例应用配置，验证插件集成和基本功能使用
- 提供详细的开发指导文档 CLAUDE.md，说明架构和 API 使用方法

pubspec.yaml

@@ -0,0 +1,70 @@
+name: arc
+description: "A new Flutter project."
+version: 0.0.1
+homepage:
+
+environment:
+  sdk: ^3.9.0
+  flutter: '>=3.3.0'
+
+dependencies:
+  flutter:
+    sdk: flutter
+  plugin_platform_interface: ^2.0.2
+
+dev_dependencies:
+  flutter_test:
+    sdk: flutter
+  flutter_lints: ^5.0.0
+
+# For information on the generic Dart part of this file, see the
+# following page: https://dart.dev/tools/pub/pubspec
+
+# The following section is specific to Flutter packages.
+flutter:
+  # This section identifies this Flutter project as a plugin project.
+  # The 'pluginClass' specifies the class (in Java, Kotlin, Swift, Objective-C, etc.)
+  # which should be registered in the plugin registry. This is required for
+  # using method channels.
+  # The Android 'package' specifies package in which the registered class is.
+  # This is required for using method channels on Android.
+  # The 'ffiPlugin' specifies that native code should be built and bundled.
+  # This is required for using `dart:ffi`.
+  # All these are used by the tooling to maintain consistency when
+  # adding or updating assets for this project.
+  plugin:
+    platforms:
+      android:
+        package: com.xiarui.arc
+        pluginClass: ArcPlugin
+
+  # To add assets to your plugin package, add an assets section, like this:
+  # assets:
+  #   - images/a_dot_burr.jpeg
+  #   - images/a_dot_ham.jpeg
+  #
+  # For details regarding assets in packages, see
+  # https://flutter.dev/to/asset-from-package
+  #
+  # An image asset can refer to one or more resolution-specific "variants", see
+  # https://flutter.dev/to/resolution-aware-images
+
+  # To add custom fonts to your plugin package, add a fonts section here,
+  # in this "flutter" section. Each entry in this list should have a
+  # "family" key with the font family name, and a "fonts" key with a
+  # list giving the asset and other descriptors for the font. For
+  # example:
+  # fonts:
+  #   - family: Schyler
+  #     fonts:
+  #       - asset: fonts/Schyler-Regular.ttf
+  #       - asset: fonts/Schyler-Italic.ttf
+  #         style: italic
+  #   - family: Trajan Pro
+  #     fonts:
+  #       - asset: fonts/TrajanPro.ttf
+  #       - asset: fonts/TrajanPro_Bold.ttf
+  #         weight: 700
+  #
+  # For details regarding fonts in packages, see
+  # https://flutter.dev/to/font-from-package