feat(web): scheduled jobs board (/console/schedules)

- cards grouped by collect / download / organize / maintain / agent checks: switch,
  in-place interval or cron edit, last result and duration, next-run countdown,
  failure reason, run now, skip next, reset to default, history drawer
- top stats (enabled / failed / running / total) and a scheduler-offline notice;
  refreshed by the schedule.changed SSE event with a 30s fallback
- agent check cards show goal template, trigger, budget and allowlist size; create /
  edit dialog (read-only capabilities, budget, trigger, interval, report to inbox)
- nav entry in the system group, route and smoke route

Co-Authored-By: Claude Opus 5.5 <[email protected]>

apps/web/app/components/console/nav.ts

@@ -15,6 +15,7 @@ import {
   ScrollText,
   Settings,
   Tags,
+  Timer,
 } from "lucide-react";
 
 export type NavItem = { to: string; label: string; icon: LucideIcon; description: string };
@@ -122,6 +123,12 @@ export const NAV_GROUPS: NavGroup[] = [
         icon: Settings,
         description: "下载器与媒体服务器实例、路径映射、API Key、Pi 上游与自动化开关",
       },
+      {
+        to: "/console/schedules",
+        label: "定时任务",
+        icon: Timer,
+        description: "周期任务与 Agent 巡检的开关、间隔、立即执行与历史",
+      },
       {
         to: "/console/engine",
         label: "工作流引擎",