feat: Implement Qdrant multi-tenancy support with collection management and tenant isolation

backend/open_webui/retrieval/vector/factory.py

@@ -1,6 +1,6 @@
 from open_webui.retrieval.vector.main import VectorDBBase
 from open_webui.retrieval.vector.type import VectorType
-from open_webui.config import VECTOR_DB
+from open_webui.config import VECTOR_DB, QDRANT_MULTI_TENANCY
 
 
 class Vector:
@@ -16,9 +16,14 @@ class Vector:
 
                 return MilvusClient()
             case VectorType.QDRANT:
-                from open_webui.retrieval.vector.dbs.qdrant import QdrantClient
+                if QDRANT_MULTI_TENANCY:
+                    from open_webui.retrieval.vector.dbs.qdrant_multitenancy import QdrantClient
 
-                return QdrantClient()
+                    return QdrantClient()
+                else:
+                    from open_webui.retrieval.vector.dbs.qdrant import QdrantClient
+
+                    return QdrantClient()
             case VectorType.PINECONE:
                 from open_webui.retrieval.vector.dbs.pinecone import PineconeClient