feat:更新统计模块

lib/models/stats.dart

@@ -0,0 +1,34 @@
+import 'package:json_annotation/json_annotation.dart';
+
+part 'stats.g.dart';
+
+@JsonSerializable()
+class SummaryStats {
+  final int recipeCount;
+  final int categoryCount;
+  final int workCount;
+
+  const SummaryStats({
+    required this.recipeCount,
+    required this.categoryCount,
+    required this.workCount,
+  });
+
+  factory SummaryStats.fromJson(Map<String, dynamic> json) =>
+      _$SummaryStatsFromJson(json);
+
+  Map<String, dynamic> toJson() => _$SummaryStatsToJson(this);
+}
+
+@JsonSerializable()
+class ChartData {
+  final String name;
+  final double value;
+
+  const ChartData({required this.name, required this.value});
+
+  factory ChartData.fromJson(Map<String, dynamic> json) =>
+      _$ChartDataFromJson(json);
+
+  Map<String, dynamic> toJson() => _$ChartDataToJson(this);
+}