Fix: Remove package-lock.json from .dockerignore

- package-lock.json was being excluded during Docker build
- This caused npm ci to fail on Hugging Face Spaces
- Remove it from .dockerignore to allow Docker to copy it

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

Co-Authored-By: Claude <noreply@anthropic.com>

.dockerignore

@@ -2,7 +2,6 @@
 node_modules
 npm-debug.log
 yarn-error.log
-package-lock.json
 yarn.lock
 
 # Testing