Use the search terms people type for a self-hosted shop #4

opentaberna.de only says "headless", "open-source" and "shop system". It never uses the terms people search with: self-hosted, web shop, e-commerce, custom, modern, Shopware alternative.

Expected once solved: the page title, meta description, H1, lede and body copy use those terms naturally (no keyword stuffing); the Organization description and llms.txt match; and check_site.rb fails if the title, description or H1 lose the core terms (open-source, headless, self-hosted, shop).