* feat: add optional nanobot features * test: update azure install hint expectation * fix: validate optional feature extras maintainer edit: verify requested dependency extras before treating optional features as installed, propagate restart state from feature enablement, and align docs with the new plugins enable command. * fix: bound optional feature installs maintainer edit: make optional feature installs time out as a normal install failure instead of leaving the WebUI or CLI action waiting indefinitely. * feat: slim optional channel dependencies * fix: log optional install commands * fix(webui): gate remote feature installs * docs: clarify webhook plugin example * fix(webui): harden optional feature installs * fix: install optional deps without package fallback * fix(cli): refine plugin feature controls * fix(webui): count enabled nanobot features * fix(webui): allow slow feature install routes * fix(webui): allow disabling websocket channel * fix(plugins): simplify optional feature controls * fix(webui): polish apps catalog states * fix(webui): confirm nanobot support installs * fix(webui): polish nanobot install dialog * fix(webui): suppress empty websocket handshakes * fix(webui): clarify apps plugin summary * fix(webui): localize workspace access copy * fix(plugins): polish optional feature controls (#4691) --------- Co-authored-by: Xubin Ren <52506698+Re-bin@users.noreply.github.com>