Yes — https://your-site/sitemap.xml is generated automatically (also reachable at /seo/sitemap.xml). It is a sitemap index pointing to sub-sitemaps: base (home page and the ordering module landing pages), meals (one entry per active meal, split into files of 900), pages (every page/blog record at /pages/<slug>, in batches of 900) and blog (every blog post at /blog/<slug>, in batches of 900). New pages and posts are included as soon as they are saved; nothing needs to be regenerated. Submit https://your-site/sitemap.xml in Google Search Console.

In the current version the pages sub-sitemap lists every page-type record without separating pages from blog posts, so a blog post can also show up there under a /pages/<slug> address in addition to its real /blog/<slug> address — that extra /pages/... link for a blog post does not resolve to a working page. This doesn't affect the correct /blog/<slug> links, which the blog sub-sitemap generates separately. A manifest.json (site name, brand color, icon) is also served for mobile "add to home screen".