Adds SkillsView.vue (cloud-skill CRUD, per-host entitlement grant/revoke,
read-only host local-skill inventory), skill API client methods + types,
and wires it into App.vue behind the skills:admin scope. Console
typecheck/build/tests green (20 passed).
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
