feat(apps): 重构 UI 架构为 presentation 层并新增 l10n 国际化支持

apps/lib/features/chat/presentation/bloc/chat_bloc.dart

@@ -2,7 +2,8 @@ import 'dart:typed_data';
 
 import 'package:flutter_bloc/flutter_bloc.dart';
 import 'package:image_picker/image_picker.dart';
-import 'package:social_app/core/api/i_api_client.dart';
+import 'package:social_app/core/network/i_api_client.dart';
+import 'package:social_app/core/l10n/l10n.dart';
 
 import '../../data/models/ag_ui_event.dart';
 import '../../data/models/chat_list_item.dart';
@@ -130,7 +131,9 @@ class ChatBloc extends Cubit<ChatState> {
           ).copyWith(
             items: _markActiveToolCallsFailed(
               state.items,
-              reason: isCanceledByUser ? '本次运行已取消' : '本次运行已失败',
+              reason: isCanceledByUser
+                  ? L10n.current.chatRunCanceled
+                  : L10n.current.chatRunFailed,
             ),
           ),
         );
@@ -428,7 +431,9 @@ class ChatBloc extends Cubit<ChatState> {
           isCancelling: false,
           currentStage: null,
           error: sseClosedBeforeTerminal
-              ? (recoveredFromHistory ? null : '连接中断，请重试')
+              ? (recoveredFromHistory
+                    ? null
+                    : L10n.current.chatSseInterruptedRetry)
               : error.toString(),
         ),
       );