copy: 巡检目标与引擎统计摘要去掉「待处理」;格式化改动文件

Co-Authored-By: Claude Opus 5.5 <[email protected]>
Claude-Session: https://claude.ai/code/session_01Cxwgnn2pbzQ7rXv3rq7fei

packages/contracts/src/api/system.ts

@@ -218,7 +218,7 @@ export const systemApi = {
       method: "get",
       path: "/engine/stats",
       scope: "admin",
-      summary: "按状态计数 / 最老待处理 / 活跃 worker 快照",
+      summary: "按状态计数 / 最早排队的运行 / 活跃 worker",
       response: ops.EngineStats,
     }),
     cancel: ep({