Rename /dashboard/snapshots to /dashboard/templates, show specs for all template types

- Rename snapshots route to templates for consistency with sidebar label
- Show vCPU and Memory values for base templates (not just snapshots),
  with tooltip distinguishing "Required" vs "Recommended"
- Show recipe copy button in admin build logs
- Admin panel defaults to /admin/templates on entry
- WORKDIR creates directory if not present (mkdir -p)
- Use USER command in pre-build instead of raw adduser
- Fix Svelte whitespace stripping in step keyword display

frontend/src/lib/components/Sidebar.svelte

@@ -49,7 +49,7 @@
 
 	const platformItems: NavItem[] = [
 		{ label: 'Capsules', icon: IconMonitor, href: '/dashboard/capsules' },
-		{ label: 'Templates', icon: IconBox, href: '/dashboard/snapshots' },
+		{ label: 'Templates', icon: IconBox, href: '/dashboard/templates' },
 		{ label: 'Metrics', icon: IconMetrics, href: '/dashboard/metrics' }
 	];