전체적인 시스템 추가.

lib/common/data/plan_detail_item.dart

@@ -0,0 +1,29 @@
+
+class PlanDetailItem {
+  final String lessonId;
+  final String lessonTag;
+  final String lessonUrl;
+  final String thumbnail;
+  final String lessonName;
+  final String lessonDescription;
+
+  PlanDetailItem({
+    required this.lessonId,
+    required this.lessonTag,
+    required this.lessonUrl,
+    required this.thumbnail,
+    required this.lessonName,
+    required this.lessonDescription,
+  });
+
+  factory PlanDetailItem.fromJson(Map<String, dynamic> json) {
+    return PlanDetailItem(
+      lessonId: json['casestudy lesson id'] ?? 'ID 없음',
+      lessonTag: json['lesson tag'] ?? '태그 없음',
+      lessonUrl: json['lesson url'] ?? 'URL 없음',
+      thumbnail: json['thumbnail'] ?? '',
+      lessonName: json['lesson_name'] ?? '이름 없음',
+      lessonDescription: json['lesson_description'] ?? '설명 없음',
+    );
+  }
+}