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lib/api/dto/daily_tip_dto.dart

@@ -0,0 +1,21 @@
+class DailyTipDto {
+  int? id;
+  String? title;
+  String? content;
+
+  DailyTipDto({this.id, this.title, this.content});
+
+  Map<String, dynamic> toJson() {
+    final map = <String, dynamic>{};
+    map["id"] = id;
+    map["title"] = title;
+    map["content"] = content;
+    return map;
+  }
+
+  DailyTipDto.fromJson(dynamic json) {
+    id = json["id"] ?? 0;
+    title = json["title"] ?? "";
+    content = json["content"] ?? "";
+  }
+}

lib/api/dto/plan_detail_dto.dart

@@ -24,6 +24,21 @@ class PlanStepDto {
     stepExplain = json["step_explain"];
     stepStatus = json["step_status"];
   }
+
+  /// 浅拷贝（只复制字段，不生成新 id）
+  PlanStepDto copyWith({
+    int? id,
+    String? stepIcon,
+    String? stepContent,
+    String? stepExplain,
+    int? stepStatus,
+  }) => PlanStepDto(
+    id: id ?? this.id,
+    stepIcon: stepIcon ?? this.stepIcon,
+    stepContent: stepContent ?? this.stepContent,
+    stepExplain: stepExplain ?? this.stepExplain,
+    stepStatus: stepStatus ?? this.stepStatus,
+  );
 }
 
 class PlanDetailDto {