后台新增 API 状态检测页：实时检测 Supabase/Open-Meteo/METAR/KNMI/MADIS/Telegram 连通性

frontend/components/ops/layout/AdminSidebar.tsx

@@ -21,6 +21,7 @@ const navGroups = [
     label: "监控",
     items: [
       { href: "/ops/overview", icon: LayoutDashboard, label: "总览" },
+      { href: "/ops/health", icon: Activity, label: "API 状态" },
       { href: "/ops/system", icon: Cpu, label: "系统状态" },
       { href: "/ops/training", icon: Database, label: "训练数据" },
       { href: "/ops/analytics", icon: BarChart3, label: "转化分析" },