fix: harden WeKnora proxy and configurable search

.gitignore

@@ -107,6 +107,10 @@ frontend-web/.offline-pack-build/
 frontend-web/.offline-extract-test/
 frontend-web-node_modules-offline-*.tar.gz
 
+# Local dependency caches and backend scratch archives
+/.pnpm-store/
+/offline-backend-20260512/backend/backend*.zip
+
 .codegraph
 codegraph.mdc