feat: add service-scoped Compose update and restore (#1648)

* feat: add service-scoped Compose update and restore

Allow updating or rebuilding one declared Compose service on multi-service
stacks without recreating siblings, with recovery snapshots, health-gate
observation, and prune holds for rollback images. Full-stack update paths
and single-service UX stay unchanged.

* fix: sanitize service-scoped update log messages for CodeQL

* fix: address service-scoped update audit findings B-01 through B-07

* fix: complete service-scoped update audit metadata and surfaces

* test: wrap Updates readiness tests for deploy-feedback context

* fix: keep service recovery reachable without Deploy Progress

Make failed service-gate recovery discoverable when Deploy Progress is
disabled or dismissed, suppress stale image-scan notification side
effects, normalize ComposeService line endings, and add focused
regression coverage.

* fix: resurface ContainersHealth density and expand on multi-service stacks

Service grouping hid the summary strip and Compact/Detailed/Expand controls that still applied to multi-container stacks.

frontend/src/components/EditorLayout/ShellOverlays.tsx

@@ -124,6 +124,8 @@ export function ShellOverlays({
         open={updateReadiness !== null}
         stackName={updateReadiness?.stackName ?? ''}
         nodeId={updateReadiness?.nodeId ?? null}
+        serviceName={updateReadiness?.serviceName}
+        mode={updateReadiness?.mode}
         onCancel={() => setUpdateReadiness(null)}
         onProceed={() => updateReadiness?.proceed()}
       />