1da67f38c7
PR 3 of 4 for the runtime service registry change. - Add service + new-shape widget TypeScript types; widgets carry service_id + widget_kind (service-bound) or null (built-in). - Add services API client + TanStack Query hooks; reconcile the widget API client/hooks to the new endpoints (remove sources/types; add builtin kinds). - Add closed frontend service registry (integrations/registry.ts) mirroring the backend, with resolveWidget(widget, services) mapping a widget to its component + refresh interval. - Add ServicePage at /services/:serviceType/:serviceId with config view, empty-on-edit secret inputs + 'set' badges, enable toggle, delete, and the service's widget-kind list. - Register /services/:serviceType/:serviceId in App.tsx. - Reconcile the six widget components to refreshIntervalMs + description props; rewrite WidgetConfigDialog around a service -> widget-kind picker. - Update Dashboard test; add integrations/registry.test.ts. Verification: frontend lint 0 errors, build success, 70 tests passed; backend ruff clean, 222 tests passed.