chore(changelog): 领取 5324 管理后台任务

修改原因：#5324 已删除旧分类查询和旧 Step6 接口，当前前端仍有 category-checks GET 与不带双指纹的 finalize 调用。

修改内容：将 changelogs-v2/2026-07/28_5324_删除旧核单兼容接口-删除接口-管理后台.md 迁移为 claimed，并记录 frontend_owner=hl-ui-pi。

实际验证：source 46 项测试通过，git diff --check 通过。

changelogs-v2/2026-07/28_5324_删除旧核单兼容接口-删除接口-管理后台.md

@@ -11,8 +11,8 @@ deployment_ref: "deploy-panel task ad042377"
 gateway_status: "verified"
 verification_status: "verified"
 verification_ref: "D:/work/project-doc/PRPs/reports/5328-deploy-qa-report.md · D:/work/project-doc/test/5328/evidence.json"
-frontend_status: "pending"
+frontend_status: "claimed"
-frontend_owner: ""
+frontend_owner: "hl-ui-pi"
 frontend_ref: ""
 target_release: ""
 verified_at: "2026-07-28T18:09:00+08:00"