- Move API routes from /_/api/ to /_api/
- Move uploaded files from /_/f/ to /_f/
- Move built assets from /_/assets/ to /_assets/
- Move admin shell from /_/admin to /_admin
- Update Vite proxy/build config, frontend fetches/WebSockets, devserver health URL, seed content, and docs
- Fix README database name to pagerite.kantadb