feat:增加日程模块

lib/models/calendar.dart

@@ -0,0 +1,54 @@
+import 'package:flutter/material.dart';
+import 'package:hive/hive.dart';
+
+// flutter packages pub run build_runner build
+part 'calendar.g.dart';
+
+@HiveType(typeId: 3)
+class Calendar extends HiveObject {
+  @HiveField(0)
+  late int id;
+
+  @HiveField(1)
+  late String title;
+
+  @HiveField(2)
+  late DateTime? startTime;
+
+  @HiveField(3)
+  late DateTime? endTime;
+
+  @HiveField(4)
+  late DateTime? scheduledTime;
+
+  @HiveField(5)
+  late DateTime createTime;
+
+  @HiveField(6)
+  late DateTime updateTime;
+
+  Calendar({
+    int? id,
+    required this.title,
+    required this.startTime,
+    required this.endTime,
+    this.scheduledTime,
+    DateTime? createTime,
+    DateTime? updateTime,
+  }) {
+    // 简单时间戳ID
+    this.id = id ?? DateTime.now().millisecondsSinceEpoch ~/ 1000;
+    this.createTime = createTime ?? DateTime.now();
+    this.updateTime = updateTime ?? DateTime.now();
+  }
+
+  static Calendar getEmpty() {
+    return Calendar(
+      id: DateTime.now().millisecondsSinceEpoch ~/ 1000,
+      title: '',
+      startTime: null,
+      endTime: null,
+      scheduledTime: null,
+    );
+  }
+}