refactor(apps): simplify API layer by removing redundant wrapper classes

- Remove ApiClientWrapper and MockApiClientWrapper
- Simplify IApiClient interface
- Update dependency injection configuration
- Optimize calendar service and AG-UI chat models

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

@@ -89,7 +89,7 @@ final _typeToFactory = {
   AgUiEventType.unknown: UnknownAgUiEvent.fromJson,
 };
 
-@JsonSerializable()
+@JsonSerializable(createFactory: false)
 class AgUiEvent {
   final AgUiEventType type;
 
@@ -104,7 +104,7 @@ class AgUiEvent {
   Map<String, dynamic> toJson() => _$AgUiEventToJson(this);
 }
 
-@JsonSerializable()
+@JsonSerializable(createFactory: false, createToJson: false)
 class UnknownAgUiEvent extends AgUiEvent {
   final Map<String, dynamic> rawJson;
 

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

@@ -6,9 +6,6 @@ part of 'ag_ui_event.dart';
 // JsonSerializableGenerator
 // **************************************************************************
 
-AgUiEvent _$AgUiEventFromJson(Map<String, dynamic> json) =>
-    AgUiEvent(type: $enumDecode(_$AgUiEventTypeEnumMap, json['type']));
-
 Map<String, dynamic> _$AgUiEventToJson(AgUiEvent instance) => <String, dynamic>{
   'type': _$AgUiEventTypeEnumMap[instance.type]!,
 };
@@ -29,12 +26,6 @@ const _$AgUiEventTypeEnumMap = {
   AgUiEventType.unknown: 'unknown',
 };
 
-UnknownAgUiEvent _$UnknownAgUiEventFromJson(Map<String, dynamic> json) =>
-    UnknownAgUiEvent(rawJson: json['rawJson'] as Map<String, dynamic>);
-
-Map<String, dynamic> _$UnknownAgUiEventToJson(UnknownAgUiEvent instance) =>
-    <String, dynamic>{'rawJson': instance.rawJson};
-
 RunStartedEvent _$RunStartedEventFromJson(Map<String, dynamic> json) =>
     RunStartedEvent(
       threadId: json['threadId'] as String,

apps/lib/features/chat/data/services/ag_ui_service.dart

@@ -1,7 +1,7 @@
 import 'dart:async';
 import 'dart:convert';
 
-import 'package:social_app/core/config/env.dart';
+import 'package:social_app/core/api/i_api_client.dart';
 
 import '../ai/ai_decision_engine.dart';
 import '../models/ag_ui_event.dart';
@@ -24,27 +24,29 @@ const _textChunkSize = 10;
 typedef EventCallback = void Function(AgUiEvent event);
 
 class AgUiService {
+  final IApiClient? _apiClient;
   EventCallback onEvent;
   final AiDecisionEngine _decisionEngine;
   final MockHistoryService _historyService;
 
-  AgUiService({EventCallback? onEvent})
+  AgUiService({EventCallback? onEvent, IApiClient? apiClient})
     : onEvent = onEvent ?? ((_) {}),
+      _apiClient = apiClient,
       _decisionEngine = AiDecisionEngine(),
       _historyService = MockHistoryService();
 
   Future<void> sendMessage(String content) async {
-    if (Env.isMockApi) {
-      await _mockEventStream(content);
-    } else {
+    if (_apiClient != null) {
       throw UnimplementedError('Real API not implemented');
     }
+    await _mockEventStream(content);
   }
 
   Future<void> loadHistory({DateTime? beforeDate}) async {
-    if (Env.isMockApi) {
-      await _mockLoadHistory(beforeDate: beforeDate);
+    if (_apiClient != null) {
+      throw UnimplementedError('Real API not implemented');
     }
+    await _mockLoadHistory(beforeDate: beforeDate);
   }
 
   bool hasEarlierHistory(DateTime fromDate) {