change to milvus standlone

config.py

@@ -41,6 +41,7 @@ USER_ID_PREFIX = "user"
 MILVUS_PERSIST_BASE_DIR = Path("./milvus_user_data_openai")
 MILVUS_INDEX_PARAMS = {"index_type": "FLAT", "metric_type": "L2", "params": {}}
 MILVUS_SEARCH_PARAMS = {"metric_type": "L2", "params": {}}
+MILVUS_STAND_URI = "http://localhost:19530"
 
 # --- RAG Pipeline Configuration (保持不变) ---
 RETRIEVER_TOP_K = 3