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/routes.ts

@@ -30,6 +30,7 @@ export default [
       route("engine/:runId", "routes/console/engine.$runId.tsx"),
       route("audit", "routes/console/audit.tsx"),
       route("settings", "routes/console/settings.tsx"),
+      route("schedules", "routes/console/schedules.tsx"),
     ]),
   ]),
   route("*", "routes/not-found.tsx"),