/shop/catalog/:productId

• Presents a read-only summary of a single catalogue product: title, slug, category, fulfilment type, and timestamps.
• Displays rich content (description, materials/care, redemption notes), variant table with pricing and validity, option metadata, and uploaded assets.
• Formats monetary values using the active team locale and currency symbol.
• Provides navigation back to the catalogue list; editing flows are planned in follow-up work.

• shop.commerce-items.v1 — when enabled, associated backend mutations populate the new commerce_item* snapshot fields consumed downstream by cart/order workflows.