Integrate Verdaccio into local/upstream mode scripts

Instead of committing a static compose.override.yml, integrate Verdaccio
into the existing mode:local/mode:upstream tooling:

- config-local.js now adds Verdaccio service when verdaccio/config.yaml exists
- config-upstream.js now removes Verdaccio service and volume when cleaning up
- Removed static compose.override.yml from version control

This approach follows the existing pattern where compose.override.yml is
dynamically generated based on local development needs.

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

)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>