refac: "rag" endpoints renamed to "retrieval"

backend/open_webui/apps/rag/vector/connector.py

@@ -1,10 +0,0 @@
-from open_webui.apps.rag.vector.dbs.chroma import ChromaClient
-from open_webui.apps.rag.vector.dbs.milvus import MilvusClient
-
-
-from open_webui.config import VECTOR_DB
-
-if VECTOR_DB == "milvus":
-    VECTOR_DB_CLIENT = MilvusClient()
-else:
-    VECTOR_DB_CLIENT = ChromaClient()