docs: explain store switching and multi-store access

[next-devin]

People working across several NEXT stores have only a brief SSO mention to explain how access works. Add a Start Here guide covering the Dashboard store switcher, the Accounts portal's Stores menu, and separate permissions for each store. Link it from Get Started, Invite Team Members, and the docs sidebar.

Verified the navigation and permission behavior against the current implementation.

Validation: Node 22 production build and its link, capability, and markup checks passed, along with search quality and size checks. The exported guide, sidebar links, and llms.txt entry are present. The guide appears in the first 10 search results for multiple stores, switch store, and store permissions.

Closes #42.

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Status	Name	Latest Commit	Preview URL	Updated (UTC)
✅ Deployment successful! View logs	nextcommerce-docs	c0311e3	Commit Preview URL Branch Preview URL	Oct 06 2026, 08:08 AM

[kilo-code-bot]

Code Review Summary

Status: No Issues Found | Recommendation: Merge

Files Reviewed (5 files)

• content/docs/meta.json
• content/docs/start-here/get-started/index.mdx
• content/docs/start-here/get-started/invite-team-members.mdx
• content/docs/start-here/meta.json
• content/docs/start-here/multiple-stores.mdx

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_{Reviewed by minimax-m3 · Input: 42.7K · Output: 1.6K · Cached: 105.9K}