Four coupled changes to the services-as-hub IA:
1. Nav entries use service TYPE names (Jellyfin, SSH Tasks, Alertmanager,
Grafana, Prometheus, Backups, Authentik) instead of conceptual names
(Media, Files, Actions, Alerts, Users). ssh_tasks collapses to one
entry ('SSH Tasks') instead of two. The content tabs inside each
service page surface the concepts (Files, Actions).
2. Service page gains a two-level tab structure when multiple enabled
instances of the same type exist: instance tabs on top ([Main Jellyfin]
[Backup Jellyfin]), content tabs below ([Overview] [Media] [Requests]
[Widgets]). Clicking an instance tab navigates to the sibling's route.
Single instance: no instance tabs. Replaces the dropdown switcher.
3. Config tab (connection fields, secrets, enable/disable, delete) moves
from the service page to Settings > Services tab. The service page
becomes a PURE operational view (Overview + content tabs + Widgets) --
no save/delete/config state. Settings gains a 4th tab 'Services' with
ServiceConfigEditor per instance (schema-driven config fields, secrets
with leave-blank-to-keep semantics, ConfirmDialog on delete).
4. Overview tab is now a configurable widget grid per service instance.
Each instance manages its own set of widgets on its Overview. Backend
widget list endpoints gain ?service_id= and ?scope= (dashboard|service)
filter params; the main Dashboard uses scope=dashboard to exclude
service-scoped widgets. The OverviewTab reuses WidgetInstanceCard +
WidgetConfigDialog. Empty state CTA for instances with no widgets.
All service-tab stubs are replaced; stubs.tsx deleted.
272 backend tests pass (+1 widget filter); 121 frontend tests pass (+3
instance-tabs + OverviewTab); lint/build green both sides.
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