Cleanup: delete dead top-level pages + update docs (Slice 11)
Delete the old top-level page files whose content was migrated into
service-page tabs in slices 5-9:
- pages/Media.tsx, Applications.tsx (-> MediaTab)
- pages/FileBrowser.tsx, FileBrowser.impl.tsx (-> FilesTab)
- pages/Actions.tsx (-> ActionsTab)
- pages/Users.tsx, UsersPage.impl.tsx (replaced by Authentik tabs)
- components/BackupsPage.tsx (-> JobsTab)
- components/ObservabilityPage.tsx (split into Alerts/Links/Metrics tabs)
- hooks/useUsers.ts (orphaned after Users page deletion)
- the corresponding page test files (Media, FileBrowser, Applications,
Actions, UsersPage) that tested the deleted pages directly.
The service-tab components are the live implementations; ServicePage
renders them. No live code references the deleted files.
Docs: append an Information Architecture section to REQUIREMENTS.md
documenting the services-as-hub model (nav shape, service-page tabs,
service type registry, Users->Authentik, Observability split, legacy
route 404s, empty state). Add a CHANGELOG entry under [Unreleased].
92 frontend tests pass (was 112; -20 deleted page tests); 271 backend
tests pass; lint/build green.
Refs openspec/changes/services-as-hub-ia/ (tasks slice 11).
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