refactor: 重构 Agent 模块为 AgentScope，删除旧版 CrewAI/LiteLLM 实现

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

@@ -6,6 +6,9 @@ enum ScheduleStatus { active, completed, canceled, archived }
 
 class ScheduleItemModel {
   final String id;
+  final String ownerId;
+  final int permission;
+  final bool isOwner;
   final String title;
   final String? description;
   final DateTime startAt;
@@ -17,8 +20,19 @@ class ScheduleItemModel {
   final DateTime createdAt;
   final DateTime updatedAt;
 
+  static const int PERMISSION_VIEW = 1;
+  static const int PERMISSION_INVITE = 2;
+  static const int PERMISSION_EDIT = 4;
+
+  bool get canEdit => isOwner || (permission & PERMISSION_EDIT) != 0;
+  bool get canInvite => isOwner || (permission & PERMISSION_INVITE) != 0;
+  bool get canDelete => isOwner;
+
   ScheduleItemModel({
     required this.id,
+    required this.ownerId,
+    this.permission = 1,
+    this.isOwner = false,
     required this.title,
     this.description,
     required this.startAt,
@@ -34,6 +48,9 @@ class ScheduleItemModel {
 
   ScheduleItemModel copyWith({
     String? id,
+    String? ownerId,
+    int? permission,
+    bool? isOwner,
     String? title,
     String? description,
     DateTime? startAt,
@@ -47,6 +64,9 @@ class ScheduleItemModel {
   }) {
     return ScheduleItemModel(
       id: id ?? this.id,
+      ownerId: ownerId ?? this.ownerId,
+      permission: permission ?? this.permission,
+      isOwner: isOwner ?? this.isOwner,
       title: title ?? this.title,
       description: description ?? this.description,
       startAt: startAt ?? this.startAt,
@@ -63,6 +83,9 @@ class ScheduleItemModel {
   factory ScheduleItemModel.fromJson(Map<String, dynamic> json) {
     return ScheduleItemModel(
       id: json['id'] as String,
+      ownerId: json['owner_id'] as String? ?? '',
+      permission: json['permission'] as int? ?? 1,
+      isOwner: json['is_owner'] as bool? ?? false,
       title: json['title'] as String,
       description: json['description'] as String?,
       startAt: DateTime.parse(json['start_at'] as String).toLocal(),