chore: add website/.pnpm-store to .gitignore

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: B4nan

.gitignore

@@ -69,6 +69,7 @@ website/versioned_docs/*/pyproject.toml
 # Website build artifacts, node dependencies
 website/build
 website/node_modules
+website/.pnpm-store
 website/.docusaurus
 website/api-typedoc-generated.json
 website/apify-shared-docspec-dump.jsonl