feat(schedules): per-check cost and model summary on GET /schedules (INT-3)

agent_check items carry agentRuns (last 100 sessions: last/avg cost, 7-day count and cost,
models, recent 3); plan page and home plan band use it instead of fetching agent runs.
Migration 0052 indexes agent_run(created_by, created_at).

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

apps/web/app/api/agent.ts

@@ -413,31 +413,3 @@ export function useRunInvocationAudit(runId: string, enabled: boolean, version =
     },
   });
 }
-
-/**
- * 巡检触发的最近会话(trigger=schedule,createdBy = schedule:<定时任务 id>):
- * 计划页的巡检卡片、首页计划带按定时任务分组取费用、模型与最近结果。一次取最近 100 条。
- */
-export function useScheduleAgentRuns() {
-  return useQuery({
-    queryKey: [...agentKeys.runs(undefined, "schedule"), "plan"],
-    queryFn: ({ signal }) =>
-      apiParsed(RunPage, AGENT_BASE, { params: cleanParams({ trigger: "schedule", limit: 100 }), signal }),
-    select: (page) => page.items,
-    staleTime: 30 * TTL_SECOND,
-    refetchInterval: 60 * TTL_SECOND,
-  });
-}
-
-/** 按定时任务 id 分组(新 → 旧,保持接口顺序) */
-export function groupRunsBySchedule(runs: AgentRun[]): Map<string, AgentRun[]> {
-  const out = new Map<string, AgentRun[]>();
-  for (const r of runs) {
-    const id = r.createdBy?.startsWith("schedule:") ? r.createdBy.slice("schedule:".length) : null;
-    if (!id) continue;
-    const list = out.get(id);
-    if (list) list.push(r);
-    else out.set(id, [r]);
-  }
-  return out;
-}