feat(admin): localize the anomalies page and add it to the sidebar (#12401)

The gamification anomalies page had hard-coded English for its loading state, Status column header and Suspicious badge, and was the only standalone non-redirect dashboard page without a sidebar entry. Both are fixed: the strings come from the common catalog, and the page joins the Gamification sidebar group as a hideable section item shown only by the "all" preset, like its siblings. The loading and empty states also become role="status" aria-live="polite" live regions with aria-busy, matching profile/page.tsx and health/page.tsx. Three new keys in en.json, propagated to the other 42 locales with the __MISSING__ sentinel.

Validated in a combined worktree with all 25 PRs of this batch boarded together: typecheck:core clean, 443/443 node-runner tests plus 14/14 vitest across every test file the batch touches, and check-changelog-integrity, check:cycles (418 files), check:provider-consistency (272 REGISTRY entries, 355 canonical providers), check:docs-counts, check:docs-sync (42 locales) and check-file-size all green.

Thanks @pacocartones.