feat(services): multi-selection and batch actions (#386)

The Services tree dropped the shared Tree's selection set and resolved actions for the lead row only. It now keeps the full selection (Ctrl/Cmd-click, Shift-click ranges, Shift+arrows); toolbar and context-menu actions common to the selection run on every selected service, skipping disabled targets and descendants of a selected group. Entries that open a dialog are disabled for a multi-selection.

Fixes #376

src/features/run/services.tsx

@@ -228,6 +228,7 @@ function actions(item: ServiceTreeItem): ServiceItemAction[] {
 
 function menu(item: ServiceTreeItem): MenuItem[] {
   const items: MenuItem[] = actions(item).map((a) => ({
+    id: a.id,
     label: a.title,
     icon: a.icon,
     disabled: a.disabled,