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/zh-TW.ts

@@ -83,6 +83,7 @@ export default {
     memory: '記憶',
     logs: '日誌',
     usage: '用量',
+    skillsUsage: '技能用量',
     channels: '頻道',
     gateways: '閘道',
     terminal: '終端機',
@@ -986,6 +987,28 @@ export default {
     noData: '目前無用量資料',
   },
 
+  skillsUsage: {
+    title: '技能用量',
+    subtitle: '追蹤 Hermes 工作階段中的技能載入與編輯',
+    refresh: '重新整理',
+    periodSelector: '技能用量期間',
+    periodLabel: '{days}天',
+    summary: '總覽',
+    totalActions: '操作',
+    loads: '載入',
+    edits: '編輯',
+    distinctSkills: '技能數',
+    topSkills: '熱門',
+    dailyTrend: '趨勢',
+    periodSummary: '最近 {days} 天',
+    skill: '技能',
+    share: '占比',
+    lastUsed: '最近',
+    noData: '暫無技能用量資料',
+    loadFailed: '技能用量載入失敗',
+    otherSkills: '其他技能',
+  },
+
   // 檔案管理
   files: {
     title: '檔案',