feat(db,contracts): trash_item migration and file manager contract refinements

- 0024_trash: trash_item table + unique idempotency index on artifact(files_idem)
- files.ts: TrashItemRow, delete planId/planExpiresAt, organize group warnings,
  scrape returns refreshMetadata taskId
- registry tests list the new table/row schema

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

packages/db/test/schema.test.ts

@@ -88,6 +88,8 @@ const EXPECTED_TABLES = [
   "browser_session",
   "browser_tab",
   "browser_control_lease",
+  // W5-A 文件管理回收站(0024)
+  "trash_item",
 ].sort();
 
 /** 不走 entityTable() 的表:追加型/引擎自有表,没有 uuid id + created_at/updated_at 三件套 */