cleanup: 移除3个废弃AI组件(AIOpsHub/AIFaultDiagnosis/AIScriptGenerator), 清理1087行死代码

frontend/src/components/layout/Sidebar.tsx

@@ -94,7 +94,6 @@ const menuItems: MenuItem[] = [
       { id: 'agent-alerts', name: 'Agent告警', icon: AlertTriangle, path: '/agent-alerts' },
     ],
   },
-  { id: 'approval', name: '资源申请', icon: CheckSquare, path: '/approval' },
   {
     id: 'automation',
     name: '自动化运维',
@@ -115,6 +114,7 @@ const menuItems: MenuItem[] = [
       { id: 'ai-predictive', name: '容量预测', icon: BarChart3, path: '/ai-predictive' },
     ],
   },
+  { id: 'approval', name: '资源申请', icon: CheckSquare, path: '/approval' },
   {
     id: 'system',
     name: '系统管理',