Initial project

packages/media_sdk/lib/src/domain/entities/media_sdk_permission_status.dart

@@ -0,0 +1,18 @@
+/// Domain Entity
+/// - 表達「通知權限狀態」這個業務概念
+/// - 穩定、可被 Facade 回傳
+/// - 不要包含 JSON / platform / plugin
+class MediaSdkPermissionStatus {
+  final bool isGranted;
+  final bool isPermanentlyDenied;
+  final DateTime? grantedAt;
+
+  const MediaSdkPermissionStatus({
+    required this.isGranted,
+    required this.isPermanentlyDenied,
+    this.grantedAt,
+  });
+
+  /// 純業務邏輯允許
+  bool get canRequestAgain => !isGranted && !isPermanentlyDenied;
+}

packages/media_sdk/lib/src/domain/repositories/media_sdk_repository.dart

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+// Repository Interface（Domain）
+
+abstract class MediaSdkRepository {
+  Future<String?> platformVersion();
+}

packages/media_sdk/lib/src/domain/usecases/platform_version.dart

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+
+//UseCase
+
+import '../repositories/media_sdk_repository.dart';
+
+class PlatformVersion 
+{
+  final MediaSdkRepository _repository;
+
+  const PlatformVersion(this._repository);
+
+  Future<String?> call() {
+    return _repository.platformVersion();
+  }
+}