backend: Blob storage package documentation, close error check

backend/app/api/handlers/v1/v1_ctrl_items_attachments.go

@@ -165,7 +165,9 @@ func (ctrl *V1Controller) handleItemAttachmentsHandler(w http.ResponseWriter, r
 			return validate.NewRequestError(err, http.StatusInternalServerError)
 		}
 
-		defer content.Close()
+		defer func() {
+			_ = content.Close()
+		}()
 
 		buf, err := io.ReadAll(content)
 		if err != nil {

backend/internal/core/blobstore/store.go

@@ -1,3 +1,4 @@
+// Package blobstore provides blob storage abstractions for reading and writing binary blobs.
 package blobstore
 
 import (