docs: Add advanced product catalog development doc

[phuoccx]

No description provided.

[Copilot]

Pull Request Overview

This PR adds comprehensive documentation for the Advanced Product Catalog feature in the B2B Components extension. The documentation explains how merchants can create customized product catalogs tailored to specific organizational units, controlling product visibility and access for different employee groups.

Key Changes:

• Added main Advanced Product Catalog documentation with feature overview and use cases
• Created setup and configuration guide for initial implementation
• Added Store API reference documentation with endpoint examples
• Documented entities and database schema with relationship diagrams

Reviewed Changes

Copilot reviewed 6 out of 6 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
products/extensions/b2b-components/index.md	Added brief description of Advanced Product Catalog to main B2B components overview
products/extensions/b2b-components/advanced-product-catalog/index.md	Main documentation page explaining features, benefits, and integration details
products/extensions/b2b-components/advanced-product-catalog/guides/store-api.md	Store API endpoints and request/response examples for catalog management
products/extensions/b2b-components/advanced-product-catalog/guides/setup-and-configuration.md	Step-by-step setup guide with prerequisites and configuration instructions
products/extensions/b2b-components/advanced-product-catalog/concepts/entities-and-schema.md	Database schema documentation with entity relationships and field descriptions
.wordlist.txt	Added OU and OUs abbreviations to accepted word list

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