feat(abacus-react): use environment variables to override npm registry

- Set NPM_CONFIG_REGISTRY and NPM_REGISTRY environment variables to force GitHub Packages
- Remove registry setting from semantic-release config to rely on environment variables
- This should force npm authentication to use GitHub Packages registry instead of npm

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

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

.github/workflows/publish-abacus-react.yml

@@ -69,4 +69,6 @@ jobs:
         working-directory: packages/abacus-react
         env:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          NPM_CONFIG_REGISTRY: https://npm.pkg.github.com
+          NPM_REGISTRY: https://npm.pkg.github.com
         run: npx semantic-release