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/server/test/schedules/schedules.test.ts

@@ -297,6 +297,27 @@ describe.skipIf(!hasPg)("定时任务注册表(真实 PG)", () => {
     expect(d).toMatchObject({ kind: "other", severity: "info", summary: "一切正常" });
     expect(await sched.harvest()).toBe(0);
 
+    // INT-3:看板给巡检带最近会话的费用与模型汇总
+    await h.db
+      .updateTable("agent_run")
+      .set({ provider: "anthropic", model: "claude-x", usage: JSON.stringify({ costUsd: 0.25 }) })
+      .where("id", "=", ar.id)
+      .execute();
+    const listed = (await api("GET", "/schedules")).body.data.items.find((j: { id: string }) => j.id === id);
+    expect(listed.agentRuns).toMatchObject({
+      count: 1,
+      lastCostUsd: 0.25,
+      avgCostUsd: 0.25,
+      weekCount: 1,
+      weekCostUsd: 0.25,
+      lastProvider: "anthropic",
+      lastModel: "claude-x",
+      models: [{ provider: "anthropic", model: "claude-x", count: 1 }],
+      recent: [{ id: ar.id, status: "succeeded", summary: "一切正常", costUsd: 0.25 }],
+    });
+    const plain = (await api("GET", "/schedules")).body.data.items.find((j: { id: string }) => j.id === "test.keep");
+    expect(plain.agentRuns).toBeUndefined();
+
     // 自定义可改名、可删;内置不可删
     expect((await api("PATCH", `/schedules/${id}`, { name: "夜间巡检" })).body.data.name).toBe("夜间巡检");
     expect((await api("DELETE", "/schedules/test.keep")).status).toBe(409);