fix: SkillsUsage 页面样式修复与 API server skill usage 统计 (#698)

* Reapply "feat: 新增 Skills Usage 监控统计与图表 (#668)" (#670)

This reverts commit 91de3b12a1.

* fix: count API-server skill usage

* fix: align SkillsUsageView header with other pages and update sidebar icon

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

---------

Co-authored-by: Zhicheng Han <zhicheng.han@mathematik.uni-goettingen.de>
Co-authored-by: Claude Opus 4.7 <noreply@anthropic.com>

packages/client/src/i18n/locales/ko.ts

@@ -79,6 +79,7 @@ export default {
     memory: '메모리',
     logs: '로그',
     usage: '사용량',
+    skillsUsage: '스킬 사용량',
     channels: '채널',
     terminal: '터미널',
     files: '파일',
@@ -758,6 +759,28 @@ export default {
     noData: '사용량 데이터 없음',
   },
 
+  skillsUsage: {
+    title: '스킬 사용량',
+    subtitle: 'Hermes 세션의 스킬 로드와 편집을 추적합니다',
+    refresh: '새로고침',
+    periodSelector: '스킬 사용량 기간',
+    periodLabel: '{days}일',
+    summary: '요약',
+    totalActions: '작업 수',
+    loads: '로드',
+    edits: '편집',
+    distinctSkills: '스킬 수',
+    topSkills: '상위',
+    dailyTrend: '일별',
+    periodSummary: '최근 {days}일',
+    skill: '스킬',
+    share: '비중',
+    lastUsed: '마지막',
+    noData: '스킬 사용량 데이터가 없습니다',
+    loadFailed: '스킬 사용량을 불러오지 못했습니다',
+    otherSkills: '기타',
+  },
+
   // 변경 이력
   changelog: {