feat(monitor): U13 主机监控大屏挂载 — HostMonitorDashboard 死代码复活为 /host-dashboard 路由 + 监控菜单

- App.tsx: 新增 HostMonitorDashboard lazy import + Route path=host-dashboard
- Sidebar.tsx: 监控告警菜单新增「主机大屏」子项 (menu.hostDashboard, agent:monitor 权限)
- Breadcrumb.tsx: 新增 host-dashboard 路由段映射
- i18n: zh-CN/en-US 新增 menu.hostDashboard + breadcrumb.hostDashboard (主机大屏/Host Dashboard), 7556 keys 对齐
- 复用已有 monitor:hostDashboard.* 23 翻译键 (AgentMonitor/MiddlewareMonitor/data-table 共享)
- ROADMAP.md: 新增 U13 模块记录 + 状态追踪表
- PROJECT_EVALUATION.md: 清除 3.3 死代码技术债 + U12 过时数字 + 监控模块补充主机大屏
- TDD_PLAN.md: 新增 P3-U13 验证用例和通过标准

验证: tsc -b=0, npm build✓(17.50s), ESLint errors=0, 17/17 集成回归通过, Docker healthy

frontend/src/App.tsx

@@ -63,6 +63,7 @@ const TraceManager = lazy(() => import('@/components/monitor/trace/TraceManager'
 const HostMonitor = lazy(() => import('@/pages/monitor/HostMonitor').then(m => ({ default: m.HostMonitor })));
 const GrafanaDashboard = lazy(() => import('@/components/monitor/dashboard/GrafanaDashboard').then(m => ({ default: m.default })));
 const MonitorCenter = lazy(() => import('@/pages/monitor/MonitorCenter').then(m => ({ default: m.MonitorCenter })));
+const HostMonitorDashboard = lazy(() => import('@/components/monitor/dashboard/HostMonitorDashboard'));
 const MetricsExplorer = lazy(() => import('@/pages/monitor/MetricsExplorer').then(m => ({ default: m.MetricsExplorer })));
 const DatasourcePage = lazy(() => import('@/components/monitor/datasource/DatasourcePage').then(m => ({ default: m.default })));
 const LogCenter = lazy(() => import('@/components/monitor/log-center/LogCenter'));
@@ -186,6 +187,7 @@ function App() {
                 <Route path="alerts" element={<LazyPage><AlertManager /></LazyPage>} />
                 <Route path="alert-center" element={<LazyPage><AlertCenter /></LazyPage>} />
                 <Route path="monitor-center" element={<LazyPage><MonitorCenter /></LazyPage>} />
+                <Route path="host-dashboard" element={<LazyPage><HostMonitorDashboard /></LazyPage>} />
                 <Route path="log-center" element={<Navigate to="/log-center/loki" replace />} />
                 <Route path="log-center/:section" element={<LazyPage><LogCenter /></LazyPage>} />
                 <Route path="logs" element={<Navigate to="/log-center/loki" replace />} />

frontend/src/components/layout/Breadcrumb.tsx

@@ -50,6 +50,7 @@ const ROUTE_I18N_MAP: Record<string, string> = {
   'datasources': 'breadcrumb.datasources',
   'dashboards': 'breadcrumb.dashboards',
   'host-monitor': 'breadcrumb.hostMonitor',
+  'host-dashboard': 'breadcrumb.hostDashboard',
   'alerts': 'breadcrumb.alerts',
   'approval': 'breadcrumb.approval',
   'approval-resource': 'breadcrumb.approvalResource',

frontend/src/components/layout/Sidebar.tsx

@@ -115,6 +115,7 @@ const menuItems: MenuItem[] = [
     children: [
       { id: 'grafana', name: 'Dashboards', labelKey: 'menu.grafana', icon: Monitor, path: '/dashboards', permission: 'monitor:alert' },
       { id: 'monitor-center', name: 'Resource Monitor', labelKey: 'menu.resourceMonitor', icon: Activity, path: '/monitor-center', permission: 'agent:monitor' },
+      { id: 'host-dashboard', name: 'Host Dashboard', labelKey: 'menu.hostDashboard', icon: LayoutDashboard, path: '/host-dashboard', permission: 'agent:monitor' },
       { id: 'trace', name: 'Tracing', labelKey: 'menu.trace', icon: GitBranch, path: '/trace', permission: 'monitor:alert' },
       { id: 'alert-center', name: 'Alert Center', labelKey: 'menu.alertCenter', icon: Bell, path: '/alert-center', permission: 'monitor:alert' },
       { id: 'datasources', name: 'Datasources', labelKey: 'menu.datasources', icon: Database, path: '/datasources', permission: 'monitor:alert' },

frontend/src/locales/en-US.json

@@ -563,6 +563,7 @@
     "monitor": "Monitoring",
     "grafana": "Dashboards",
     "resourceMonitor": "Resource Monitor",
+    "hostDashboard": "Host Dashboard",
     "trace": "Tracing",
     "alertCenter": "Alert Center",
     "datasources": "Datasources",
@@ -7995,6 +7996,7 @@
     "datasources": "Data Sources",
     "dashboards": "Dashboards",
     "hostMonitor": "Host Monitor",
+    "hostDashboard": "Host Dashboard",
     "alerts": "Alerts",
     "approval": "Requests",
     "approvalResource": "Resource Request",

frontend/src/locales/zh-CN.json

@@ -563,6 +563,7 @@
     "monitor": "监控中心",
     "grafana": "监控大屏",
     "resourceMonitor": "资源监控",
+    "hostDashboard": "主机大屏",
     "trace": "链路追踪",
     "alertCenter": "告警中心",
     "datasources": "数据源",
@@ -7995,6 +7996,7 @@
     "datasources": "数据源",
     "dashboards": "监控大屏",
     "hostMonitor": "主机监控",
+    "hostDashboard": "主机大屏",
     "alerts": "监控告警",
     "approval": "资源申请",
     "approvalResource": "资源申请",