fix(timer): 修复 F2 代码质量问题

- HostServiceBase: move Log::error before throw so it actually executes
- TimerBase: remove empty comment block

extend/base/common/service/HostServiceBase.php

@@ -93,9 +93,8 @@ class HostServiceBase
                 Log::info("已将 {$staleCount} 个过期节点标记为离线。");
             }
         } catch (\Exception $e) {
-            throw $e;
             Log::error("节点 [{$nodeId}] 心跳更新失败: " . $e->getMessage());
-            Log::error($e);
+            throw $e;
         }
     }