The editor moves from /funpack/movie/ to /funpack/, taking its API to
/funpack/api/*. The frontend needed no change — api.js already derives its base
from the page's own path. /funpack/movie/ and /funpack/easy/ redirect there;
they are registered before the static catch-all, which would otherwise swallow
them, and after the /funpack/refinement_keys and /funpack/batch routes, which
still win by registration order.
Deletes hub.py and the easy_gen package: the hub picked between two apps that
are now one, and every Easy Gen frontend file was either a duplicate of an
editor file or a second way to do something the editor already does.
window.FunPackAppName went with them, so the three gates that read it —
models.js, sampler_panel.js, onboarding.js — now read the mode instead, live
rather than once at load. The wizard drops its second host table.