Summary

• reorganize System Settings into Traffic controls, Observability, Data retention & cleanup, and Maintenance actions
• merge routing-related controls and separate immediate maintenance actions from saved settings
• add locale strings for the new section labels
• bump release version to 0.24.1

Verification

• corepack pnpm --filter @helm/admin check
• corepack pnpm lint
• corepack pnpm build
• corepack pnpm test -- apps/admin/src/lib/api/settings.test.ts (repo Vitest runner completed 322 files / 5002 tests)
• corepack pnpm --filter @helm/gateway exec playwright test --project=admin --grep "renders the settings page"
• desktop/mobile screenshot pass for /admin/settings: no horizontal overflow or clipped controls

Note: lint reports one pre-existing informational Biome suggestion in packages/core/src/memory/forgetting/facts.test.ts; exit code is 0 and this PR leaves it untouched.