Initial project

packages/rtc_sdk/lib/src/domain/entities/rtc_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 RtcSdkPermissionStatus {
+  final bool isGranted;
+  final bool isPermanentlyDenied;
+  final DateTime? grantedAt;
+
+  const RtcSdkPermissionStatus({
+    required this.isGranted,
+    required this.isPermanentlyDenied,
+    this.grantedAt,
+  });
+
+  /// 純業務邏輯允許
+  bool get canRequestAgain => !isGranted && !isPermanentlyDenied;
+}

packages/rtc_sdk/lib/src/domain/repositories/rtc_sdk_repository.dart

@@ -0,0 +1,5 @@
+// Repository Interface（Domain）
+
+abstract class RtcSdkRepository {
+  Future<String?> platformVersion();
+}

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

@@ -0,0 +1,15 @@
+
+//UseCase
+
+import '../repositories/rtc_sdk_repository.dart';
+
+class PlatformVersion 
+{
+  final RtcSdkRepository _repository;
+
+  const PlatformVersion(this._repository);
+
+  Future<String?> call() {
+    return _repository.platformVersion();
+  }
+}