feat: AI预测分析接入真实后端数据 + 修复CloudBilling文件损坏

- AIPredictiveAnalytics: 替换3组硬编码mock为实时数据驱动预测
  - 指标预测: 基于dashboard metrics时序数据(cpu/memory/disk)线性回归计算斜率与R²
  - 容量规划: 基于日均增长率推算阈值触及时间(天),动态生成AI扩容建议
  - 异常预测: 基于告警规则阈值+当前趋势+事件频率计算异常触发概率
  - 概览卡片数据驱动化(置信度基于R²拟合度,高风险/容量预警计数实时计算)
- CloudBilling.tsx: 修复read_file导致的行号前缀损坏(501行全部含N|前缀)

frontend/src/components/monitor/AlertManager.tsx

@@ -1,4 +1,5 @@
 import { useState, useEffect } from 'react';
+import { useConfirm } from '@/components/ui/confirm-dialog';
 import { Card, CardContent, CardHeader, CardTitle, CardDescription } from '@/components/ui/card';
 import { Button } from '@/components/ui/button';
 import { Input } from '@/components/ui/input';
@@ -93,6 +94,7 @@ function resolveChannelRef(value: string, channels: any[]): { type: string; name
 }
 
 export function AlertManager() {
+  const _confirm = useConfirm();
   const [activeTab, setActiveTab] = useState('events');
   const [searchQuery, setSearchQuery] = useState('');
   const [severityFilter, setSeverityFilter] = useState<string>('all');
@@ -164,7 +166,7 @@ export function AlertManager() {
   };
 
   const handleDeleteRule = async (id: any) => {
-    if (!window.confirm('确定删除此告警规则？')) return;
+    { const ok = await _confirm({ title: '删除告警规则', description: '确定删除此告警规则？', confirmText: '删除', variant: 'destructive' }); if (!ok) return; }
     try {
       await alertApi.deleteRule(id);
       loadData();
@@ -275,7 +277,7 @@ export function AlertManager() {
   };
 
   const handleDeleteChannel = async (id: any) => {
-    if (!window.confirm('确定删除此通知渠道？')) return;
+    { const ok = await _confirm({ title: '删除通知渠道', description: '确定删除此通知渠道？', confirmText: '删除', variant: 'destructive' }); if (!ok) return; }
     try {
       await alertApi.deleteNotifyChannel(id);
       if (editingChannel && editingChannel.id === id) resetChannelForm();