fix SSE格式

src/main/java/com/knowledge/base/infrastructure/util/http/SseOutputAdapter.java

@@ -1,6 +1,5 @@
 package com.knowledge.base.infrastructure.util.http;
 
-import cn.hutool.core.util.StrUtil;
 import org.springframework.web.servlet.mvc.method.annotation.SseEmitter;
 
 import java.io.IOException;
@@ -15,8 +14,16 @@ public class SseOutputAdapter implements WriterAdapter {
 
     @Override
     public void writeLine(String line) throws IOException {
-        if (StrUtil.isNotBlank(line)) {
-            emitter.send(SseEmitter.event().data(line));
+        if (line == null || line.isBlank()) {
+            return;
         }
+
+        // 如果 line 以 "data: " 开头，则去除该前缀
+        if (line.startsWith("data: ")) {
+            line = line.substring(6).trim();
+        }
+
+        // 发送单行 SSE 事件
+        emitter.send(SseEmitter.event().data(line));
     }
 }