Fix GitHub Actions: commit pnpm-lock.yaml for reproducible builds

Remove pnpm-lock.yaml from .gitignore to fix GitHub Actions cache error. Lock files should be committed to ensure reproducible builds across environments.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <[email protected]>

Author: stared

.gitignore

@@ -1,6 +1,5 @@
 # Dependencies
 node_modules/
-pnpm-lock.yaml
 
 # Build outputs
 dist/