- Add a dedicated `/hosts/` page with host cards and enabled/disabled filtering.
- Link the dashboard Hosts metric and top navigation to the new page.
- Add host enable/disable plus schedule and scheduled-retention pause/resume actions.
## Tests
- `.venv/bin/python manage.py test src.pobsync_backend.tests.test_views.ViewTests.test_base_navigation_groups_primary_and_system_links src.pobsync_backend.tests.test_views.ViewTests.test_dashboard_renders_hosts_and_latest_runs src.pobsync_backend.tests.test_views.ViewTests.test_dashboard_hosts_live_returns_hosts_partial src.pobsync_backend.tests.test_views.ViewTests.test_hosts_list_renders_host_cards_and_controls src.pobsync_backend.tests.test_views.ViewTests.test_hosts_list_filters_by_enabled_state src.pobsync_backend.tests.test_views.ViewTests.test_update_host_state_toggles_host_schedule_and_retention --verbosity 2`
- `.venv/bin/python manage.py check`
- `.venv/bin/python manage.py test src.pobsync_backend --verbosity 2`
Closes#48Closes#49