docs: replace daedalus-service basic auth with per-user DRF tokens

mnemosyne/library/models.py

@@ -87,6 +87,11 @@ class Library(StructuredNode):
     # libraries. Unique-indexed so a workspace cannot have two libraries.
     workspace_id = StringProperty(unique_index=True, required=False)
 
+    # For workspace-scoped libraries: the Mnemosyne username that owns
+    # the workspace. Mutations via the workspaces API are restricted to
+    # this user. Null for global libraries.
+    owner_username = StringProperty(required=False, index=True)
+
     # Content-type configuration
     chunking_config = JSONProperty(default={})
     embedding_instruction = StringProperty(default="")