Add a `client-setup` command to the published `@penpot/mcp` package.
When invoked as `penpot-mcp client-setup`, the bin delegates to the `add-mcp`
CLI against the local MCP server URL (from `PENPOT_MCP_SERVER_PORT`, default
4401), run via npx.
Update docs on MCP client configuration.
Recommend calling `add-mcp` directly for now, since the `client-setup` command
only becomes available once a new `@penpot/mcp` release is published to npm.
AI-assisted-by: Claude
Co-authored-by: Michael Panchenko <michael.panchenko@oraios-ai.de>
