feat: 统一自动化任务调度配置并增强聊天流恢复

apps/test/features/chat/data/services/ag_ui_service_test.dart

@@ -273,4 +273,27 @@ void main() {
 
     await expectLater(service.sendMessage('hello'), throwsA(isA<StateError>()));
   });
+
+  test('sendMessage fails when SSE closes before terminal event', () async {
+    final startedLines = _buildSseEvent(
+      id: '41',
+      type: AgUiEventTypeWire.runStarted,
+      payload: '{"type":"RUN_STARTED","threadId":"thread-1","runId":"run-new"}',
+    );
+
+    final service = AgUiService(
+      apiClient: _FakeApiClient(sseLines: <String>[...startedLines]),
+    );
+
+    await expectLater(
+      service.sendMessage('hello'),
+      throwsA(
+        isA<StateError>().having(
+          (e) => e.message,
+          'message',
+          contains('SSE closed before terminal event'),
+        ),
+      ),
+    );
+  });
 }