This is all about the mapping between site-url/xxxx/yyyy/zzzz and Astro pages. Even though there are no files in the /src/pages tree, the magic files [slug].astro, [...path].astro perform the same sort of rôle as if there were.
Add these to /src/:
└── pages ├── author │ └── [slug].astro ├── category │ └── [slug].astro ├── index.astro ├── [...path].astro ├── [slug].astro ├── tag │ └── [slug].astro └── [year] └── [month].astro
All this would have been impossible without AI assistance.