fix(结构化解析): 修正自动结构化解析API路径

- 路径从/parse/structured改为/api/v1/parse/structured

backend/graph-service/src/main/java/com/lingyue/graph/listener/DocumentParsedEventListener.java

@@ -123,7 +123,7 @@ public class DocumentParsedEventListener {
             updateTaskProgress(documentId, "structured", "processing", 10, null);
             
             // 调用本地 API 触发结构化解析
-            String url = "http://localhost:" + serverPort + "/parse/structured/" + documentId;
+            String url = "http://localhost:" + serverPort + "/api/v1/parse/structured/" + documentId;
             
             ResponseEntity<Map> response = restTemplate.getForEntity(url, Map.class);