feat:增加日程模块

lib/models/task.dart

@@ -1,24 +1,26 @@
 class Task {
-  final String id;
+  final int id;
   String title;
-  String? description;
-  DateTime createdAt;
+  String? desc;
   DateTime? dueDate;
+  DateTime? scheduleDate;
   bool isCompleted;
   Priority priority;
   String? category;
+  DateTime createTime;
 
   Task({
-    String? id,
+    int? id,
     required this.title,
-    this.description,
-    DateTime? createdAt,
+    this.desc,
     this.dueDate,
+    this.scheduleDate,
     this.isCompleted = false,
     this.priority = Priority.medium,
     this.category,
-  }) : id = id ?? DateTime.timestamp().microsecond.toString(),
-        createdAt = createdAt ?? DateTime.now();
+    DateTime? createTime,
+  }) : id = id ?? DateTime.timestamp().microsecond,
+        createTime = DateTime.now();
 }
 
 enum Priority { low, medium, high }