feat: AG-UI 协议对齐与路由导航功能

- 前端: 添加 SSE 流式支持、stateSnapshot 事件、路由导航工具
- 前端: 实现工具调用审批流程，支持 pending 状态展示
- 后端: Agent 状态管理与会话持久化相关重构
- 文档: 新增 agent-agui-full-alignance 设计文档
- 测试: 补充相关单元测试和集成测试

apps/lib/features/home/ui/screens/home_screen.dart

@@ -5,6 +5,7 @@ import 'package:lucide_icons/lucide_icons.dart';
 import '../../../../core/theme/design_tokens.dart';
 import '../../../chat/data/models/chat_list_item.dart';
 import '../../../chat/presentation/bloc/chat_bloc.dart';
+import '../../../chat/data/tools/route_navigation_tool.dart';
 import '../../../chat/ui/widgets/ui_schema_renderer.dart';
 import '../../../../shared/widgets/toast/toast.dart';
 import '../../../../shared/widgets/toast/toast_type.dart';
@@ -55,6 +56,7 @@ class _HomeScreenState extends State<HomeScreen> {
     _messageController.dispose();
     _scrollController.dispose();
     _chatBloc.close();
+    RouteNavigationTool.instance.clearNavigator();
     super.dispose();
   }
 
@@ -64,6 +66,17 @@ class _HomeScreenState extends State<HomeScreen> {
 
   @override
   Widget build(BuildContext context) {
+    RouteNavigationTool.instance.bindNavigator((target, {replace = false}) {
+      if (!mounted) {
+        return;
+      }
+      if (replace) {
+        context.go(target);
+      } else {
+        context.push(target);
+      }
+    });
+
     return BlocProvider.value(
       value: _chatBloc,
       child: BlocConsumer<ChatBloc, ChatState>(
@@ -328,6 +341,24 @@ class _HomeScreenState extends State<HomeScreen> {
           ),
           const SizedBox(width: 8),
           Text(statusText, style: TextStyle(fontSize: 12, color: statusColor)),
+          if (item.toolName == 'navigate_to_route' &&
+              item.status == ToolCallStatus.pending) ...[
+            const SizedBox(width: 8),
+            GestureDetector(
+              onTap: () => _chatBloc.approveToolCall(item.callId),
+              child: Container(
+                padding: const EdgeInsets.symmetric(horizontal: 8, vertical: 4),
+                decoration: BoxDecoration(
+                  color: AppColors.blue600,
+                  borderRadius: BorderRadius.circular(6),
+                ),
+                child: const Text(
+                  '同意',
+                  style: TextStyle(fontSize: 11, color: AppColors.white),
+                ),
+              ),
+            ),
+          ],
         ],
       ),
     );