feat: Add build info and localization for entry app

- Introduced buildinfo.json5 to enable impeller feature.
- Added Chinese localization strings in string.json for module description and entry ability.
- Created Ability.test.ets for unit testing of ability functionalities.
- Implemented List.test.ets to run the ability tests.
- Developed TestAbility.ets to manage test execution and lifecycle events.
- Created Index.ets as a testability page with UI components.
- Added OpenHarmonyTestRunner.ts for managing test execution in OpenHarmony.
- Defined module.json5 for entry_test module configuration.
- Established color.json and string.json for base resources.
- Included icon.png for the test module.
- Created test_pages.json to define testability page sources.
- Configured hvigor and oh-package.json5 for project setup.
- Updated pubspec.yaml and related files to downgrade Dart SDK to 3.11.0 and adjust dependencies.
- Added PowerShell script to enable OpenHarmony Flutter toolchain.
- Updated multiple package pubspec.yaml files to align with Dart SDK version 3.11.0 and adjust dependencies accordingly.

packages/core_webview/pubspec.yaml

@@ -8,14 +8,14 @@ resolution: workspace
 # 「用 target 换真实 URL」的接口调用**不在本包**——那需要 core_network，不是允许的边。
 # 换票由调用方（feature）完成后把 URL 传进来，本包只负责校验和承载。
 environment:
-  sdk: ^3.12.0
+  sdk: ^3.11.0
 
 dependencies:
   core_auth: ^0.1.0
   core_foundation: ^0.1.0
   flutter:
     sdk: flutter
-  flutter_riverpod: ^3.3.2
+  flutter_riverpod: 3.2.1
   webview_flutter: ^4.14.1
 
 dev_dependencies: