📚 docs(document): add SKUs story and upgrade Storybook to v10

[acasazza]

Summary

Closes #733
Closes #730
Relates to #727

• Upgrade all @storybook/* packages to ^10.3.4 (from mixed v8/v10 state)
• Add @storybook/addon-mcp + .mcp.json MCP server config at repo root
• Create packages/document/src/stories/skus/001.skus.mdx — documentation for all 5 SKU components (SkusContainer, Skus, SkuField, SkuListsContainer, SkuList) with prop tables, requirement/children badges, and code examples
• Create packages/document/src/stories/skus/skus.stories.tsx — interactive visual-test stories
• Add MSW mock handlers for /api/skus and /api/sku_lists/:id

Bug fixes

• SkuList — Skus rendered empty: SkuList was registering the list ID but never bridging the fetched SKU data into SkuContext, so <Skus> had nothing to iterate. Fixed by wrapping children with SkuContext.Provider containing the resolved skuLists[id] data.
• Mock data out of sync: MSW fixture SKU codes didn't match the story values, causing stale/wrong data in Storybook. Updated mocks/data/skus.js and mocks/data/sku_lists.js with matching codes and the correct SKU list ID (yZjQIDxrly).

New features

• SkuListsContainer — params prop: Added an optional params?: QueryParamsRetrieve<SkuList> prop. Default behavior keeps include: ["skus"] (no fields filter → all SKU fields are returned). Consumers can pass any valid retrieve params to override or extend the default (e.g. restrict fields, add extra includes).
• Stories updated: Added a second SkuListsContainer story (custom params) to demonstrate the new params prop with explicit include and fields customization.

Test plan

• pnpm storybook starts without errors in packages/document
• Storybook sidebar shows "Skus" section with "Overview" and "Stories" pages
• All 5 SKU components are documented in the Overview page
• SkuListsContainer — default include (skus) story renders SKU name and code from the real API
• SkuListsContainer — custom params story renders with explicit field selection
• SkusContainer — name and code and SkuField — image stories render correctly
• pnpm --filter document run mcp starts the MCP server

[pkg-pr-new]

npm i https://pkg.pr.new/@commercelayer/react-components@735

commit: 99541b5