completed test plan - pass, modified setup.js

.gitignore

@@ -40,3 +40,7 @@ backend/uploads/temp/
 claude.md
 claude_status.md
 feature_request*.md
+backend/add_vendor_to_documents.js
+backend/fix_multivendor_constraint.js
+backend/server.js-backup
+backend/setup.js-backup

backend/.gitignore

@@ -0,0 +1,5 @@
+
+# One-time migration scripts
+backend/fix_multivendor_constraint.js
+backend/migrate_multivendor.js
+backend/add_vendor_to_documents.js