fix：参数默认值去掉多余的-

Author: szc0616

backend/services/rag-indexer-service/src/main/java/com/datamate/rag/indexer/infrastructure/event/RagEtlService.java

@@ -51,9 +51,9 @@
 public class RagEtlService {
     private static final Semaphore SEMAPHORE = new Semaphore(10);
 
-    @Value("${datamate.rag.milvus-host:-milvus-standalone}")
+    @Value("${datamate.rag.milvus-host:milvus-standalone}")
     private String milvusHost;
-    @Value("${datamate.rag.milvus-port:-19530}")
+    @Value("${datamate.rag.milvus-port:19530}")
     private int milvusPort;
 
     private final RagFileRepository ragFileRepository;