Fix npx @fedify/cli execution across platforms

- Fix binary path resolution in Node.js wrapper script
- Temporarily remove Sharp dependency to resolve installation issues
- Remove image resizing from fedify lookup command (temporary)
- Fix build artifact paths in GitHub Actions workflow

This is a comprehensive hotfix for various npx @fedify/cli execution
issues on different platforms. The Sharp dependency removal is a
temporary workaround; image resizing will be restored in a future
patch using an alternative approach.