Correctness fix for multi-instance: 6 hooks gain optional serviceId in queryKey;
7 API fns append ?service_id; 4 backup endpoints gain service_id filter
(Alertmanager/Prometheus status already take it — zero backend change there);
3 tabs pass instance.id; dashboard widgets unaffected; all params optional
(backward-compat). usePrometheusTargets + useMonitoringMachines stay global.
Correctness fix: observability + backup hooks query globally, so multi-instance
service pages show data for the wrong instance. Tabs already accept instance
prop with TODO comments; backend mostly supports service_id already. Scope:
add serviceId to 6 hooks + fetch fns + 3 tabs; add service_id to backup
endpoints. Backward-compatible (optional params). ~250-350 lines, single slice.
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