umputun / remark42 / 28544415418

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refactor(api): replace go-chi/chi router with go-pkgz/routegroup (#2103)

Migrate the REST router off go-chi/chi onto go-pkgz/routegroup (backed by the
stdlib http.ServeMux), removing the last use of go-chi from the backend:

- rest.go routes() builds the tree with routegroup (Mount/Group/Route/With) and
  net/http method+path patterns instead of chi's Get/Post/Route/Mount helpers
- chi.URLParam(...) -> r.PathValue(...) in the admin, public and private handlers
- rest_public_test.go loadPictureCtrl test uses routegroup + http.ServeMux
- rest_test.go: add TestRest_FileServerStaticAssets (bare /web -> /web/ redirect,
  cache headers, 404, directory-listing block) and update the path-traversal test
  for ServeMux normalising a literal ".." (encoded traversal is still rejected
  by the handler)
- drop go-chi/chi from go.mod, go.sum and vendor; update the CLAUDE.md reference

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