feat(web): split plan page from tasks (FE-6)

- Nav overview group: 首页 / 任务 / 计划 / Agent 会话; tasks page drops the plan tab
- /console/tasks?tab=plan[&job=] redirects to /console/schedules[?job=]
- Plan page: 自动任务 compact grouped list (switch, interval preset/custom, last result,
  countdown, failure reason, run now/skip/run records) and Agent 巡检 cards (goal,
  allowlist, budget, upstream/model, trigger, cost per run, recent sessions); split stats
- Home plan band: two counts linking to #auto / #checks
- Docs: console-ia §7.4a, glossary, schedules runbook; smoke routes

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

apps/web/app/components/tasks/task-stream.tsx

@@ -94,7 +94,7 @@ function ScheduleBanner({ jobId, onClear }: { jobId: string; onClear: () => void
           运行记录
         </Button>
         <Button asChild variant="ghost" size="xs">
-          <Link to={`/console/tasks?tab=plan&job=${encodeURIComponent(jobId)}`}>
+          <Link to={`/console/schedules?job=${encodeURIComponent(jobId)}`}>
             <ExternalLink />
             计划
           </Link>