The Templates page only featured a hard-coded list, so `featured: true`
in a template (Prompture Hub, Torre) never reached the Featured-first
view. The page now honors the flag alongside the list, and bundled
templates carry it into the catalog and the published index.
template_service.py held port allocation, magic-variable resolution and
the template catalog alongside install/update in one 2,800-line class.
Those three groups move verbatim into TemplatePortsMixin,
TemplateMagicMixin and TemplateCatalogMixin, each in its own module;
TemplateService inherits them, so its surface (106 attributes, same
classmethod/staticmethod kinds) and every caller are unchanged. Tests
that patched module globals now patch the module the code lives in.
Juan Denis