fix(nodes): return labels in single-node GET so the detail view shows them
The node detail view (/app/nodes/:id) reads `node.labels` to render a
node's existing labels, but the single-node GET endpoint returned a bare
BackendNode whose Labels live in a separate table - so the list was always
empty and operators could only add labels, never see what was already set
(#10527). The same response also lacked in_flight_count and model_count.
Add NodeRegistry.GetWithExtras, mirroring the existing List vs ListWithExtras
split: bare Get stays cheap for the routing hot paths and existence checks,
while the detail endpoint uses the enriched variant to attach the labels map
and live counts. No frontend change is needed - the UI already renders
existing labels once the data is present.
Closes#10527
Assisted-by: Claude:claude-opus-4-8 [Claude Code]
Signed-off-by: Ettore Di Giacinto <mudler@localai.io>
Co-authored-by: Ettore Di Giacinto <mudler@localai.io>