Rework the dashboard around convergence:
- ServiceControls / ServiceCard / JobCard: replace start/restart/stop
with a Power toggle (set enabled → apply, i.e. activate/deactivate)
plus Restart (the one imperative bounce).
- ToolDetail: install/uninstall becomes an Enable/Disable toggle;
`installed` stays the live state, `enabled` the desired one.
- ConfigPanel Apply and CreateDeploymentForm now POST /apply (one
converge that renders + restarts only what changed) instead of
/deploy + a separate start/restart.
- New ConvergePanel on Overview: a terraform-style Preview (POST /apply
plan=true) showing would-activate/restart/deactivate, then Apply.
- useApply + useSetEnabled hooks; `enabled` added to Service/Job/
Deployment types; both handle the self-restart connection drop.
Backend: PUT /config/deployments/{name}/enabled sets desired on/off
(edit config; caller runs apply) — the declarative toggle the UI uses.
Dashboard builds clean (tsc + vite); 59 API tests pass; live /apply and
/services?enabled verified after an api restart.
