Add modular application packages with backup-aware install/upgrade/downgrade,
DNF-backed version lists with TTL caching, and HTML bootstrap for faster loads.
Improve the version picker (labels, selection state, background meta refresh) and
route applicationMeta through shared page meta cache. Update static assets and
cache buster for manageServices.js. Repository also includes related updates to
serviceManager, upgrade tooling, website functions, and user management from this
development tree.
