feat(skills): curated GitHub catalog redesign (#3016)

* feat(skills): remove ClawHub catalog integration

Drop the ClawHub registry as a skills catalog source across web server,
shared UI, VS Code, docs, and locales. The catalog now serves git-based
sources only: the curated Anthropic repo and user-defined repositories.
Also removes the now-unused adm-zip dependency.

* feat(skills): redesign catalog around curated GitHub repositories

Replace the single-source dropdown with a card grid of curated GitHub
repositories (Anthropic, OpenAI, Cursor pstack/skills, Matt Pocock) plus
user-defined sources. Source cards show skill counts, GitHub stars, and
last-updated time; a global search covers all loaded sources.

Server: curated sources gain GitHub repo metadata (stars, pushed_at)
fetched best-effort with a 3-hour in-memory and on-disk cache; scans
run through a concurrency-limited, deduplicated cache with 3-hour TTL
persisted across restarts. Refresh still bypasses the cache.

Shared UI: source cards, global search with clear button, per-skill
GitHub links, install/installed states. VS Code curated list updated
to match. All new copy translated across 12 locales.

* fix(skills): address catalog review findings

- GitHub metadata fetch timeout drops to 1.5s (under the catalog
  client's 3s deadline) and failed lookups cache briefly (5 min) so
  repeated catalog loads do not re-hit a failing API.
- Disk cache files are written with owner-only permissions (0o600);
  rename preserves the mode.
- loadSource deduplicates concurrent in-flight requests per source and
  the shared isLoadingSource flag now clears only when the last active
  source load finishes.

packages/ui/src/lib/i18n/messages/ko.settings.ts

@@ -865,16 +865,26 @@ export const settingsDict = {
   'settings.skills.catalog.page.mode.manual': '수동',
   'settings.skills.catalog.page.mode.external': 'External',
   'settings.skills.catalog.page.title': '스킬 카탈로그',
+  'settings.skills.catalog.page.subtitle': '선별된 저장소에서 바로 사용 가능한 스킬을 설치하거나 직접 소스를 추가하세요.',
+  'settings.skills.catalog.page.section.sources': '소스',
+  'settings.skills.catalog.page.searchAllPlaceholder': '모든 소스에서 스킬 검색…',
+  'settings.skills.catalog.page.search.clear': '검색 지우기',
+  'settings.skills.catalog.page.source.skillsCount': '스킬: {count}개',
+  'settings.skills.catalog.page.source.stars': '스타: {count}',
+  'settings.skills.catalog.page.source.updated': '업데이트: {time}',
+  'settings.skills.catalog.page.source.addOwnTitle': '직접 소스 추가',
+  'settings.skills.catalog.page.source.addOwnDescription': '스킬이 있는 아무 Git 저장소',
+  'settings.skills.catalog.page.source.viewRepo': 'GitHub에서 저장소 열기',
+  'settings.skills.catalog.page.skill.viewOnGithub': 'GitHub에서 스킬 보기',
+  'settings.skills.catalog.page.list.searchTitle': '검색 결과',
   'settings.skills.catalog.page.section.sourceRepository': '카탈로그 저장소',
   'settings.skills.catalog.page.field.selectSourcePlaceholder': '저장소 선택',
   'settings.skills.catalog.page.actions.refreshTitle': '새로고침',
   'settings.skills.catalog.page.actions.removeCatalogTitle': 'Catalog 제거',
   'settings.skills.catalog.page.actions.addCatalog': 'Catalog 추가',
   'settings.skills.catalog.page.actions.removeCatalog': 'Catalog 제거',
-  'settings.skills.catalog.page.actions.loadMoreSkills': '스킬 더 불러오기',
   'settings.skills.catalog.page.loading.catalog': '로딩 중...',
   'settings.skills.catalog.page.loading.skills': '스킬 불러오는 중...',
-  'settings.skills.catalog.page.loading.more': '로딩 중...',
   'settings.skills.catalog.page.foundCount': '스킬 {count}개 발견',
   'settings.skills.catalog.page.error.catalogTitle': 'Catalog 오류',
   'settings.skills.catalog.page.empty.noSkillsTitle': '스킬을 찾을 수 없습니다',
@@ -882,7 +892,6 @@ export const settingsDict = {
   'settings.skills.catalog.page.badge.installed': '설치됨({scope})',
   'settings.skills.catalog.page.badge.notInstallable': '설치할 수 없음',
   'settings.skills.catalog.page.badge.unknown': '알 수 없음',
-  'settings.skills.catalog.page.byOwnerPrefix': '작성자',
   'settings.skills.catalog.page.removeDialog.title': 'Catalog 제거',
   'settings.skills.catalog.page.removeDialog.description': '이 카탈로그를 제거하시겠습니까?',
   'settings.openchamber.passkeys.title': 'Passkeys',