feat(timer): 新增定时器配置、日志和主机的后台管理界面

T10: TimerConfig CURD - task management with run_type/status editing,
     manual trigger button, task_name read-only, no add/delete
T11: TimerLog CURD - read-only log viewer with filters and color badges
T12: Host list enhanced - is_master column, setMaster button

extend/base/admin/view/system/host/index.html

@@ -7,6 +7,7 @@
                data-auth-delete="{:auth('system.host/delete')}"
                data-auth-export="{:auth('system.host/export')}"
                data-auth-modify="{:auth('system.host/modify')}"
+               data-auth-set-master="{:auth('system.host/setMaster')}"
                lay-filter="currentTable">
         </table>
     </div>