feat(react): 优化事件处理逻辑并添加事件内容字段

- 在WorkPanelEvent中添加content字段用于存储事件内容
- 简化sendWorkPanelEvent方法调用，移除冗余参数
- 完善DefaultReactCallback中的事件发送逻辑，增加错误处理
- 调整EventSplitter的endStream方法签名以支持回调
- 修复代码格式问题

backend/src/main/java/pangea/hiagent/agent/react/DefaultReactCallback.java

 package pangea.hiagent.agent.react;
 
+import java.io.IOException;
+
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.stereotype.Component;
 import lombok.extern.slf4j.Slf4j;
 import pangea.hiagent.agent.service.UserSseService;
-import pangea.hiagent.workpanel.IWorkPanelDataCollector;
+import pangea.hiagent.common.utils.UserUtils;
+import pangea.hiagent.web.dto.WorkPanelEvent;
 
 /**
  * 简化的ReAct回调类
@@ -18,18 +21,23 @@ public class DefaultReactCallback implements ReactCallback {
 
     @Override
     public void onStep(ReactStep reactStep) {
-        log.info("ReAct步骤触发: 类型={}, 内容摘要={}", 
-            reactStep.getStepType(), 
-            reactStep.getContent() != null ? 
-                reactStep.getContent().substring(0, Math.min(50, reactStep.getContent().length())) : "null");
 
         String reactStepName = reactStep.getStepType().name();
 
+        try {
             userSseService.sendWorkPanelEvent(WorkPanelEvent.builder()
-                        .eventType(reactStepName)
+                    .type(reactStepName)
                     .content(reactStep.getContent())
-                        .userId(reactStep.getUserId())
+                    .userId(UserUtils.getCurrentUserIdStatic())
                     .build());
+        } catch (IOException e) {
+            log.error("发送ReAct步骤到WorkPanel失败: 类型={}, 内容摘要={}",
+                    reactStep.getStepType(),
+                    reactStep.getContent() != null
+                            ? reactStep.getContent().substring(0, Math.min(50, reactStep.getContent().length()))
+                            : "null",
+                    e);
+        }
 
         // 记录最终答案到日志
         log.info("[WorkPanel] 记录{} {}", reactStepName,

backend/src/main/java/pangea/hiagent/agent/react/EventSplitter.java

@@ -49,7 +49,7 @@ public class EventSplitter {
         }
 
         // 流式结束时，调用此方法输出最后一个事件
-        public void endStream() {
+        public void endStream(ReactCallback tokenConsumer) {
             if (currentType != null && currentContent.length() > 0) {
                 callback.onStep(new ReactStep(stepNumber++, ReactStepType.fromString(currentType), currentContent.toString()));
             }

backend/src/main/java/pangea/hiagent/tool/BaseTool.java

@@ -116,7 +116,7 @@ public abstract class BaseTool {
                     .build();
             
             // 获取用户的SSE发射器
-            userSseService.sendWorkPanelEvent(event, userId);
+            userSseService.sendWorkPanelEvent(event);
             
             
             log.debug("已发送工具事件: {}#{}, 状态: {}", toolName, methodName, status);

backend/src/main/java/pangea/hiagent/web/dto/WorkPanelEvent.java

@@ -34,6 +34,10 @@ public class WorkPanelEvent implements Serializable {
      */
     private Long timestamp;
     
+    /**
+     * 事件内容
+     */
+    private String content;
     /**
      * 元数据
      */

backend/src/main/java/pangea/hiagent/workpanel/WorkPanelDataCollector.java

@@ -384,7 +384,7 @@ public class WorkPanelDataCollector implements IWorkPanelDataCollector {
             // 通过EventService发送事件到所有SSE连接
             for (SseEmitter emitter : unifiedSseService.getEmitters()) {
                 try {
-                    unifiedSseService.sendWorkPanelEvent(emitter, event);
+                    unifiedSseService.sendWorkPanelEvent(event);
                 } catch (Exception e) {
                     log.debug("通过EventService发送事件失败: {}", e.getMessage());
                 }