feat(system): retention cleanup jobs, storage panel API and health storage level (CACHE-2)

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

packages/contracts/src/api.ts

@@ -2017,6 +2017,21 @@ export const Api = {
       query: ops.SystemHealthHistoryQuery,
       response: ops.SystemHealthHistory,
     }),
+    storage: ep({
+      method: "get",
+      path: "/system/storage",
+      scope: "admin",
+      summary: "存储：表体积前 15、库总体积、各缓存用量与预算、备份占用、DATA_DIR 分目录用量、清理任务状态",
+      response: ops.SystemStorage,
+    }),
+    storageCleanup: ep({
+      method: "post",
+      path: "/system/storage/cleanup/{target}",
+      scope: "admin",
+      summary: "立即执行某个存储清理任务（排入对应定时任务，已在排队或运行中则合并）",
+      params: ops.StorageCleanupParam,
+      response: ops.StorageCleanupResult,
+    }),
   },
 
   // ── 引擎面板(仅 admin) ──