feat(前端UI): 实现运维监控前端界面

- 新增帮助提示组件（HelpTooltip.vue）
- 更新侧边栏添加 ops 监控菜单项
- 扩展设置视图集成 ops 配置面板
- 新增 ops 监控视图目录（dashboard, alerts, realtime, settings 等）

frontend/src/views/admin/ops/utils/opsFormatters.ts

+/**
+ * Ops 页面共享的格式化/样式工具。
+ *
+ * 目标：尽量对齐 `docs/sub2api` 备份版本的视觉表现（需求一致部分保持一致），
+ * 同时避免引入额外 UI 依赖。
+ */
+
+import type { OpsSeverity } from '@/api/admin/ops'
+import { formatBytes } from '@/utils/format'
+
+export function getSeverityClass(severity: OpsSeverity): string {
+  const classes: Record<string, string> = {
+    P0: 'bg-red-100 text-red-800 dark:bg-red-900/30 dark:text-red-400',
+    P1: 'bg-orange-100 text-orange-800 dark:bg-orange-900/30 dark:text-orange-400',
+    P2: 'bg-yellow-100 text-yellow-800 dark:bg-yellow-900/30 dark:text-yellow-400',
+    P3: 'bg-blue-100 text-blue-800 dark:bg-blue-900/30 dark:text-blue-400'
+  }
+  return classes[String(severity || '')] || classes.P3
+}
+
+export function truncateMessage(msg: string, maxLength = 80): string {
+  if (!msg) return ''
+  return msg.length > maxLength ? msg.substring(0, maxLength) + '...' : msg
+}
+
+/**
+ * 格式化日期时间（短格式，和旧 Ops 页面一致）。
+ * 输出: `MM-DD HH:mm:ss`
+ */
+export function formatDateTime(dateStr: string): string {
+  const d = new Date(dateStr)
+  if (Number.isNaN(d.getTime())) return ''
+  return `${String(d.getMonth() + 1).padStart(2, '0')}-${String(d.getDate()).padStart(2, '0')} ${String(d.getHours()).padStart(2, '0')}:${String(d.getMinutes()).padStart(2, '0')}:${String(d.getSeconds()).padStart(2, '0')}`
+}
+
+export function sumNumbers(values: Array<number | null | undefined>): number {
+  return values.reduce<number>((acc, v) => {
+    const n = typeof v === 'number' && Number.isFinite(v) ? v : 0
+    return acc + n
+  }, 0)
+}
+
+/**
+ * 解析 time_range 为分钟数。
+ * 支持：`5m/30m/1h/6h/24h`
+ */
+export function parseTimeRangeMinutes(range: string): number {
+  const trimmed = (range || '').trim()
+  if (!trimmed) return 60
+  if (trimmed.endsWith('m')) {
+    const v = Number.parseInt(trimmed.slice(0, -1), 10)
+    return Number.isFinite(v) && v > 0 ? v : 60
+  }
+  if (trimmed.endsWith('h')) {
+    const v = Number.parseInt(trimmed.slice(0, -1), 10)
+    return Number.isFinite(v) && v > 0 ? v * 60 : 60
+  }
+  return 60
+}
+
+export function formatHistoryLabel(date: string | undefined, timeRange: string): string {
+  if (!date) return ''
+  const d = new Date(date)
+  if (Number.isNaN(d.getTime())) return ''
+  const minutes = parseTimeRangeMinutes(timeRange)
+  if (minutes >= 24 * 60) {
+    return `${String(d.getMonth() + 1).padStart(2, '0')}-${String(d.getDate()).padStart(2, '0')} ${String(d.getHours()).padStart(2, '0')}:${String(d.getMinutes()).padStart(2, '0')}`
+  }
+  return `${String(d.getHours()).padStart(2, '0')}:${String(d.getMinutes()).padStart(2, '0')}`
+}
+
+export function formatByteRate(bytes: number, windowMinutes: number): string {
+  const seconds = Math.max(1, (windowMinutes || 1) * 60)
+  return `${formatBytes(bytes / seconds, 1)}/s`
+}