feat: 增强日历功能并集成 AgentScope 代理服务

apps/lib/features/calendar/data/models/schedule_item_model.dart

@@ -112,6 +112,7 @@ class ScheduleMetadata {
   final String? color;
   final String? location;
   final String? notes;
+  final int? reminderMinutes;
   final List<Attachment> attachments;
   final int version;
   final Map<String, dynamic> raw;
@@ -120,6 +121,7 @@ class ScheduleMetadata {
     this.color,
     this.location,
     this.notes,
+    this.reminderMinutes,
     List<Attachment>? attachments,
     this.version = 1,
     Map<String, dynamic>? raw,
@@ -130,6 +132,7 @@ class ScheduleMetadata {
     String? color,
     String? location,
     String? notes,
+    int? reminderMinutes,
     List<Attachment>? attachments,
     int? version,
     Map<String, dynamic>? raw,
@@ -138,6 +141,7 @@ class ScheduleMetadata {
       color: color ?? this.color,
       location: location ?? this.location,
       notes: notes ?? this.notes,
+      reminderMinutes: reminderMinutes ?? this.reminderMinutes,
       attachments: attachments ?? this.attachments,
       version: version ?? this.version,
       raw: raw ?? this.raw,
@@ -156,6 +160,7 @@ class ScheduleMetadata {
       color: json['color'] as String?,
       location: json['location'] as String?,
       notes: json['notes'] as String?,
+      reminderMinutes: json['reminder_minutes'] as int?,
       attachments: attachments,
       version: (json['version'] as int?) ?? 1,
       raw: Map<String, dynamic>.from(json),
@@ -167,6 +172,7 @@ class ScheduleMetadata {
       'color': color,
       'location': location,
       'notes': notes,
+      'reminder_minutes': reminderMinutes,
       'attachments': attachments.map((item) => item.toJson()).toList(),
       'version': version,
     };