🔧 fix(useApiRequest): improve playground SSE error handling and stream completion tracking

web/src/hooks/useApiRequest.js

@@ -246,9 +246,11 @@ export const useApiRequest = (
 
     let responseData = '';
     let hasReceivedFirstResponse = false;
+    let isStreamComplete = false; // 添加标志位跟踪流是否正常完成
 
     source.addEventListener('message', (e) => {
       if (e.data === '[DONE]') {
+        isStreamComplete = true; // 标记流正常完成
         source.close();
         sseSourceRef.current = null;
         setDebugData(prev => ({ ...prev, response: responseData }));
@@ -290,6 +292,8 @@ export const useApiRequest = (
     });
 
     source.addEventListener('error', (e) => {
+      // 只有在流没有正常完成且连接状态异常时才处理错误
+      if (!isStreamComplete && source.readyState !== 2) {
         console.error('SSE Error:', e);
         const errorMessage = e.data || t('请求发生错误');
 
@@ -306,10 +310,12 @@ export const useApiRequest = (
         completeMessage(MESSAGE_STATUS.ERROR);
         sseSourceRef.current = null;
         source.close();
+      }
     });
 
     source.addEventListener('readystatechange', (e) => {
-      if (e.readyState >= 2 && source.status !== undefined && source.status !== 200) {
+      // 检查 HTTP 状态错误，但避免与正常关闭重复处理
+      if (e.readyState >= 2 && source.status !== undefined && source.status !== 200 && !isStreamComplete) {
         const errorInfo = handleApiError(new Error('HTTP状态错误'));
         errorInfo.status = source.status;
         errorInfo.readyState = source.readyState;