feat(chat): add ToolResult and UiCard models

apps/lib/features/chat/data/models/tool_result.dart

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+import 'package:json_annotation/json_annotation.dart';
+
+part 'tool_result.g.dart';
+
+/// 工具执行结果（给 AI 的原始数据）
+@JsonSerializable()
+class ToolResult {
+  final String? eventId;
+  final bool ok;
+  final String? message;
+
+  ToolResult({this.eventId, this.ok = true, this.message});
+
+  factory ToolResult.fromJson(Map<String, dynamic> json) =>
+      _$ToolResultFromJson(json);
+
+  Map<String, dynamic> toJson() => _$ToolResultToJson(this);
+}
+
+/// UI 卡片 Schema（给 UI 渲染）
+@JsonSerializable()
+class UiCard {
+  @JsonKey(name: 'type')
+  final String cardType;
+
+  @JsonKey(name: 'version')
+  final String? schemaVersion;
+
+  final Map<String, dynamic> data;
+  final List<CardAction>? actions;
+
+  UiCard({
+    required this.cardType,
+    this.schemaVersion = 'v1',
+    required this.data,
+    this.actions,
+  });
+
+  factory UiCard.fromJson(Map<String, dynamic> json) => _$UiCardFromJson(json);
+
+  Map<String, dynamic> toJson() => _$UiCardToJson(this);
+}
+
+/// 卡片操作按钮
+@JsonSerializable()
+class CardAction {
+  final String type;
+  final String label;
+  final String? target;
+  final String? action;
+
+  CardAction({
+    required this.type,
+    required this.label,
+    this.target,
+    this.action,
+  });
+
+  factory CardAction.fromJson(Map<String, dynamic> json) =>
+      _$CardActionFromJson(json);
+
+  Map<String, dynamic> toJson() => _$CardActionToJson(this);
+}
+
+/// 日历卡片数据
+@JsonSerializable()
+class CalendarCardData {
+  final String id;
+  final String title;
+  final String? description;
+  final String startAt;
+  final String? endAt;
+  final String? timezone;
+  final String? location;
+  final String? color;
+  final String? sourceType;
+
+  CalendarCardData({
+    required this.id,
+    required this.title,
+    this.description,
+    required this.startAt,
+    this.endAt,
+    this.timezone,
+    this.location,
+    this.color,
+    this.sourceType,
+  });
+
+  factory CalendarCardData.fromJson(Map<String, dynamic> json) =>
+      _$CalendarCardDataFromJson(json);
+
+  Map<String, dynamic> toJson() => _$CalendarCardDataToJson(this);
+}

apps/lib/features/chat/data/models/tool_result.g.dart

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+// GENERATED CODE - DO NOT MODIFY BY HAND
+
+part of 'tool_result.dart';
+
+// **************************************************************************
+// JsonSerializableGenerator
+// **************************************************************************
+
+ToolResult _$ToolResultFromJson(Map<String, dynamic> json) => ToolResult(
+  eventId: json['eventId'] as String?,
+  ok: json['ok'] as bool? ?? true,
+  message: json['message'] as String?,
+);
+
+Map<String, dynamic> _$ToolResultToJson(ToolResult instance) =>
+    <String, dynamic>{
+      'eventId': instance.eventId,
+      'ok': instance.ok,
+      'message': instance.message,
+    };
+
+UiCard _$UiCardFromJson(Map<String, dynamic> json) => UiCard(
+  cardType: json['type'] as String,
+  schemaVersion: json['version'] as String? ?? 'v1',
+  data: json['data'] as Map<String, dynamic>,
+  actions: (json['actions'] as List<dynamic>?)
+      ?.map((e) => CardAction.fromJson(e as Map<String, dynamic>))
+      .toList(),
+);
+
+Map<String, dynamic> _$UiCardToJson(UiCard instance) => <String, dynamic>{
+  'type': instance.cardType,
+  'version': instance.schemaVersion,
+  'data': instance.data,
+  'actions': instance.actions,
+};
+
+CardAction _$CardActionFromJson(Map<String, dynamic> json) => CardAction(
+  type: json['type'] as String,
+  label: json['label'] as String,
+  target: json['target'] as String?,
+  action: json['action'] as String?,
+);
+
+Map<String, dynamic> _$CardActionToJson(CardAction instance) =>
+    <String, dynamic>{
+      'type': instance.type,
+      'label': instance.label,
+      'target': instance.target,
+      'action': instance.action,
+    };
+
+CalendarCardData _$CalendarCardDataFromJson(Map<String, dynamic> json) =>
+    CalendarCardData(
+      id: json['id'] as String,
+      title: json['title'] as String,
+      description: json['description'] as String?,
+      startAt: json['startAt'] as String,
+      endAt: json['endAt'] as String?,
+      timezone: json['timezone'] as String?,
+      location: json['location'] as String?,
+      color: json['color'] as String?,
+      sourceType: json['sourceType'] as String?,
+    );
+
+Map<String, dynamic> _$CalendarCardDataToJson(CalendarCardData instance) =>
+    <String, dynamic>{
+      'id': instance.id,
+      'title': instance.title,
+      'description': instance.description,
+      'startAt': instance.startAt,
+      'endAt': instance.endAt,
+      'timezone': instance.timezone,
+      'location': instance.location,
+      'color': instance.color,
+      'sourceType': instance.sourceType,
+    };