feat(shared,tests): add error boundaries, lib utils, i18n messages, and integration tests
shared:
- Add class-filter, error-state, route-error, section-error-boundary, widget-boundary components
- Add ui/alert component
- Add constants directory
- Add breached-password, export-utils, permission-bitmap, rate-limit, resolve-action-error, route-permissions, route-resolver, type-guards lib
- Add i18n messages (en, zh-CN) for invitation-codes, parent, questions, rbac
tests:
- Add integration tests for elective
- Add tests/setup/empty-stub
scripts:
- Add update-md.cjs, tmp_append_en.ps1, tmp_merge_en.ps1 utilities
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