fix(i18n): add tagline and fix liveDashboard section placement

apps/web/messages/zh-TW.json

@@ -55,7 +55,6 @@
     "spikeActive": "飆高進行中",
     "triggerSpike": "觸發 {host}",
     "clearSpike": "清除飆高",
-    "liveDashboard": "即時事件流 (SSE)",
     "approvalCards": "HITL 授權卡片 (CPO-107)",
     "statusShowcase": "狀態指示燈展示",
     "lowRiskDemo": "低風險 - 1 秒長按",
@@ -86,6 +85,7 @@
   },
   "dashboard": {
     "title": "AI中心",
+    "tagline": "AI 指揮操作介面",
     "subtitle": "AI 驅動的統一運維視圖",
     "liveStats": "即時統計",
     "activeNodes": "活躍節點",
@@ -103,6 +103,7 @@
     "aiAgent": "AI 代理",
     "globalPulse": "全局脈搏",
     "liveUpdates": "即時更新",
+    "liveDashboard": "即時事件流 (SSE)",
     "loadingMetrics": "載入指標中...",
     "metricsError": "指標載入失敗",
     "flow": {